- home
- Search
- NEANIAS Atmospheric Research Community
- Open Access
- Academy of Finland
- NEANIAS Atmospheric Research Community
- Open Access
- Academy of Finland
Loading
description Publicationkeyboard_double_arrow_right Article 2019 Finland EnglishPublisher:Public Library of Science (PLoS) Funded by:AKA | Multilevel assessment of ..., AKA | Multilevel assessment of ...AKA| Multilevel assessment of sustainable oil spill response measures and their impact on Arctic and subarctic marine environments (OILRES) / Consortium: OILRES ,AKA| Multilevel assessment of sustainable oil spill response measures and their impact on Arctic and subarctic marine environments (OILRES) / Consortium: OILRESMiettinen, Hanna; Bomberg, Malin; Nyyssönen, Mari; Reunamo, Anna; Jørgensen, Kirsten S.; Vikman, Minna;pmc: PMC6605675
pmid: 31265451
Two long-term potentially oil exposed Baltic Sea coastal sites near old oil refineries and harbours were compared to nearby less exposed sites in terms of bacterial, archaeal and fungal microbiomes and oil degradation potential. The bacterial, archaeal and fungal diversities were similar in oil exposed and less exposed sampling sites based on bacterial and archaeal 16S rRNA gene and fungal 5.8S rRNA gene amplicon sequencing from both DNA and RNA fractions. The number of genes participating in alkane degradation (alkB) or PAH-ring hydroxylation (PAH–RHDα) were detected by qPCR in all water and sediment samples. These numbers correlated with the number of bacterial 16S rRNA gene copies in sediment samples but not with the concentration of petroleum hydrocarbons or PAHs. This indicates that both the clean and the more polluted sites at the Baltic Sea coastal areas have a potential for petroleum hydrocarbon degradation. The active community (based on RNA) of the coastal Baltic Sea water differed largely from the total community (based on DNA). The most noticeable difference was seen in the bacterial community in the water samples were the active community was dominated by Cyanobacteria and Proteobacteria whereas in total bacterial community Actinobacteria was the most abundant phylum. The abundance, richness and diversity of Fungi present in water and sediment samples was in general lower than that of Bacteria and Archaea. Furthermore, the sampling location influenced the fungal community composition, whereas the bacterial and archaeal communities were not influenced. This may indicate that the fungal species that are adapted to the Baltic Sea environments are few and that Fungi are potentially more vulnerable to or affected by the Baltic Sea conditions than Bacteria and Archaea.
Europe PubMed Centra... arrow_drop_down Europe PubMed CentralArticle . 2019Full-Text: http://europepmc.org/articles/PMC6605675Data sources: PubMed CentralHELDA - Digital Repository of the University of HelsinkiArticle . 2019Data sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=PMC6605675&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 14 citations 14 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Europe PubMed Centra... arrow_drop_down Europe PubMed CentralArticle . 2019Full-Text: http://europepmc.org/articles/PMC6605675Data sources: PubMed CentralHELDA - Digital Repository of the University of HelsinkiArticle . 2019Data sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=PMC6605675&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type , Article 2016 United States, Switzerland, France, Finland, France, FinlandPublisher:American Association for the Advancement of Science (AAAS) Funded by:EC | nanoCAVa, AKA | Formation and growth of a..., AKA | ATMOSPHERIC SCIENCES - Pa... +16 projectsEC| nanoCAVa ,AKA| Formation and growth of atmospheric aerosol particles: from molecular to global scale ,AKA| ATMOSPHERIC SCIENCES - Particularly for determination of cluster and nanoaerosol composition ,AKA| Measurement of Nano-particle Nucelation in the Atmosphere via Cluster Ion Mass Spectrometry ,FCT| Collaboration in the CLOUD experiment ,SNSF| Investigation of new particle formation in the CLOUD chamber at CERN and the PSI smog chamber ,AKA| Nanoaerosol synthesis for bridging laboratory and field investigations of new particle formation and growth ,AKA| Formation and growth of atmospheric aerosol particles: from molecular to global scale ,FWF| Chemical Characterization of Organic Nanoparticles ,UKRI| E-Infrastructure Interconnectivity EPSRC - Chris Taylor ,AKA| Infrastructure of Environmental and Atmospheric Sciences (ATM-Science) ,SNSF| CLOUD ,SNSF| FORCE Proposal to Investigation of Secondary Organic Aerosol Formation in the PSI Smog Chamber and at CERN ,EC| ATMNUCLE ,AKA| Computational research chain from quantum chemistry to climate change / Consortium: ComQuaCC ,AKA| Nucleation of particles and ice in the atmosphere: from surface layer to upper troposphere ,SNSF| Investigation of Secondary Organic Aerosol Formation in the PSI Smog Chamber and at CERN ,UKRI| Global Aerosol Synthesis and Science Project (GASSP) to reduce the uncertainty in aerosol radiative forcing ,SNSF| Molecular Imaging of CNS-Immune System Interactions in Multiple SclerosisEimear M. Dunne; Hamish Gordon; Andreas Kürten; Joao Almeida; Jonathan Duplissy; Christina Williamson; Ismael K. Ortega; Kirsty J. Pringle; Alexey Adamov; Urs Baltensperger; Peter Barmet; Francois Benduhn; F. Bianchi; Martin Breitenlechner; Antony D. Clarke; Joachim Curtius; Josef Dommen; Neil M. Donahue; Sebastian Ehrhart; Richard C. Flagan; Alessandro Franchin; Roberto Guida; Jani Hakala; Armin Hansel; Martin Heinritzi; Tuija Jokinen; Juha Kangasluoma; Jasper Kirkby; Markku Kulmala; Agnieszka Kupc; Michael J. Lawler; Katrianne Lehtipalo; Vladimir Makhmutov; Graham Mann; Serge Mathot; Joonas Merikanto; Pasi Miettinen; Athanasios Nenes; Antti Onnela; Alexandru Rap; Carly Reddington; Francesco Riccobono; N. A. D. Richards; Matti P. Rissanen; Linda Rondo; Nina Sarnela; Siegfried Schobesberger; Kamalika Sengupta; Mario Simon; Mikko Sipilä; James N. Smith; Yuri Stozkhov; António Tomé; Jasmin Tröstl; Paul E. Wagner; Daniela Wimmer; Paul M. Winkler; Douglas R. Worsnop; Kenneth S. Carslaw;pmid: 27789796
New particle formation in the atmosphere produces around half of the cloud condensation nuclei that seed cloud droplets. Such particles have a pivotal role in determining the properties of clouds and the global radiation balance. Dunne et al. used the CLOUD (Cosmics Leaving Outdoor Droplets) chamber at CERN to construct a model of aerosol formation based on laboratory measured nucleation rates. They found that nearly all nucleation involves either ammonia or biogenic organic compounds. Furthermore in the present day atmosphere cosmic ray intensity cannot meaningfully affect climate via nucleation.Science this issue p. 1119Fundamental questions remain about the origin of newly formed atmospheric aerosol particles because data from laboratory measurements have been insufficient to build global models. In contrast gas phase chemistry models have been based on laboratory kinetics measurements for decades. We built a global model of aerosol formation by using extensive laboratory measurements of rates of nucleation involving sulfuric acid ammonia ions and organic compounds conducted in the CERN CLOUD (Cosmics Leaving Outdoor Droplets) chamber. The simulations and a comparison with atmospheric observations show that nearly all nucleation throughout the present day atmosphere involves ammonia or biogenic organic compounds in addition to sulfuric acid. A considerable fraction of nucleation involves ions but the relatively weak dependence on ion concentrations indicates that for the processes studied variations in cosmic ray intensity do not appreciably affect climate through nucleation in the present day atmosphere.U http://science.sciencemag.org/content/sci/354/6316/1119.full.pdf
Science arrow_drop_down ScienceOther literature type . Article . 2016 . Peer-reviewedCaltech AuthorsArticle . 2016 . Peer-reviewedFull-Text: https://authors.library.caltech.edu/71775/5/Global%20atmospheric%20particle%20formation.pdfData sources: Caltech AuthorsInfoscience - EPFL scientific publicationsOther literature typeData sources: Infoscience - EPFL scientific publicationsadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1126/science.aaf2649&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesbronze 276 citations 276 popularity Top 1% influence Top 10% impulse Top 1% Powered by BIP!visibility 34visibility views 34 download downloads 740 Powered bymore_vert Science arrow_drop_down ScienceOther literature type . Article . 2016 . Peer-reviewedCaltech AuthorsArticle . 2016 . Peer-reviewedFull-Text: https://authors.library.caltech.edu/71775/5/Global%20atmospheric%20particle%20formation.pdfData sources: Caltech AuthorsInfoscience - EPFL scientific publicationsOther literature typeData sources: Infoscience - EPFL scientific publicationsadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1126/science.aaf2649&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2019 EnglishPublisher:Copernicus Publications Funded by:EC | EUROCHAMP-2020, AKA | Centre of Excellence in A..., EC | QAPPAEC| EUROCHAMP-2020 ,AKA| Centre of Excellence in Atmospheric Science From Molecular and Biolocigal processes to The Global Climate ,EC| QAPPAE. Kari; E. Kari; L. Hao; A. Ylisirniö; A. Buchholz; A. Leskinen; A. Leskinen; P. Yli-Pirilä; I. Nuutinen; I. Nuutinen; K. Kuuspalo; K. Kuuspalo; J. Jokiniemi; C. L. Faiola; C. L. Faiola; S. Schobesberger; A. Virtanen;The fraction of gasoline direct-injection (GDI) vehicles comprising the total vehicle pool is projected to increase in the future. However, thorough knowledge about the influence of GDI engines on important atmospheric chemistry processes is missing – namely, their contribution to secondary organic aerosol (SOA) precursor emissions, contribution to SOA formation, and potential role in biogenic–anthropogenic interactions. The objectives of this study were to (1) characterize emissions from modern GDI vehicles and investigate their role in SOA formation chemistry and (2) investigate biogenic–anthropogenic interactions related to SOA formation from a mixture of GDI-vehicle emissions and a model biogenic compound, α-pinene. Specifically, we studied SOA formation from modern GDI-vehicle emissions during the constant-load driving. In this study we show that SOA formation from GDI-vehicle emissions was observed in each experiment. Volatile organic compounds (VOCs) measured with the proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) could account for 19 %–42 % of total SOA mass generated in each experiment. This suggests that there were lower-volatility intermediate VOCs (IVOCs) and semi-volatile organic compounds (SVOCs) in the GDI-vehicle exhaust that likely contributed to SOA production but were not detected with the instrumentation used in this study. This study also demonstrates that two distinct mechanisms caused by anthropogenic emissions suppress α-pinene SOA mass yield. The first suppressing effect was the presence of NOx. This mechanism is consistent with previous reports demonstrating suppression of biogenic SOA formation in the presence of anthropogenic emissions. Our results indicate a possible second suppressing effect, and we suggest that the presence of anthropogenic gas-phase species may have suppressed biogenic SOA formation by alterations to the gas-phase chemistry of α-pinene. This hypothesized change in oxidation pathways led to the formation of α-pinene oxidation products that most likely did not have vapor pressures low enough to partition into the particle phase. Overall, the presence of gasoline-vehicle exhaust caused a more than 50 % suppression in α-pinene SOA mass yield compared to the α-pinene SOA mass yield measured in the absence of any anthropogenic influence.
All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=doajarticles::26f2c058a568c65c1abf5f1c252956bc&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=doajarticles::26f2c058a568c65c1abf5f1c252956bc&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2023 FinlandPublisher:Copernicus GmbH Funded by:AKA | Where does water go when ..., AKA | Integrated Biodiversity C..., EC | CHARTER +1 projectsAKA| Where does water go when snow melts? New spatio-temporal resolution in stable water isotopes measurements to inform cold climate hydrological modelling ,AKA| Integrated Biodiversity Conservation and Carbon Sequestration in the Changing Environment (IBC-CARBON) / Consortium: IBC-CARBON ,EC| CHARTER ,AKA| Land use as a modulator of land cover transitions and the ecosystem–atmosphere carbon balance (LANDMOD)L.-J. Meriö; L.-J. Meriö; A. Rauhala; P. Ala-aho; A. Kuzmin; P. Korpelainen; T. Kumpula; B. Kløve; H. Marttila;Detailed information on seasonal snow cover and depth is essential to the understanding of snow processes, to operational forecasting, and as input for hydrological models. Recent advances in uncrewed or unmanned aircraft systems (UASs) and structure from motion (SfM) techniques have enabled low-cost monitoring of spatial snow depth distribution in resolutions of up to a few centimeters. Here, we study the spatiotemporal variability in snow depth and interactions between snow and vegetation in different subarctic landscapes consisting of a mosaic of conifer forest, mixed forest, transitional woodland/shrub, and peatland areas. To determine the spatiotemporal variability in snow depth, we used high-resolution (50 cm) snow depth maps generated from repeated UAS–SfM surveys in the winter of 2018/2019 and a snow-free bare-ground survey after snowmelt. Due to poor subcanopy penetration with the UAS–SfM method, tree masks were utilized to remove canopy areas and the area (36 cm) immediately next to the canopy before analysis. Snow depth maps were compared to the in situ snow course and a single-point continuous ultrasonic snow depth measurement. Based on the results, the difference between the UAS–SfM survey median snow depth and single-point measurement increased for all land cover types during the snow season, from +5 cm at the beginning of the accumulation to −16 cm in coniferous forests and −32 cm in peatland during the melt period. This highlights the poor representation of point measurements in selected locations even on the subcatchment scale. The high-resolution snow depth maps agreed well with the snow course measurement, but the spatial extent and resolution of maps were substantially higher. The snow depth range (5th–95th percentiles) within different land cover types increased from 17 to 42 cm in peatlands and from 33 to 49 cm in the coniferous forest from the beginning of the snow accumulation to the melt period. Both the median snow depth and its range were found to increase with canopy density; this increase was greatest in the conifer forest area, followed by mixed forest, transitional woodland/shrub, and open peatlands. Using the high-spatial-resolution data, we found a systematic increase (2–20 cm) and then a decline in snow depth near the canopy with increasing distance (from 1 to 2.5 m) of the peak value through the snow season. This study highlights the applicability of the UAS–SfM in high-resolution monitoring of snow depth in multiple land cover types and snow–vegetation interactions in subarctic and remote areas where field data are not available or where the available data are collected using classic point measurements or snow courses.
The Cryosphere (TC) arrow_drop_down University of Oulu Repository - JultikaArticle . 2023License: CC BYData sources: University of Oulu Repository - Jultikaadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/tc-17-4363-2023&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 1 citations 1 popularity Average influence Average impulse Average Powered by BIP!more_vert The Cryosphere (TC) arrow_drop_down University of Oulu Repository - JultikaArticle . 2023License: CC BYData sources: University of Oulu Repository - Jultikaadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/tc-17-4363-2023&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2018 Finland, DenmarkPublisher:Copernicus GmbH Funded by:AKA | Biogeochemical links betw..., AKA | Nitrogen processes in the...AKA| Biogeochemical links between climate change and eutrophication in the Baltic Sea ,AKA| Nitrogen processes in the water column of the Baltic SeaT. Jilbert; T. Jilbert; E. Asmala; E. Asmala; E. Asmala; C. Schröder; R. Tiihonen; R. Tiihonen; J.-P. Myllykangas; J.-P. Myllykangas; J. J. Virtasalo; A. Kotilainen; P. Peltola; P. Ekholm; S. Hietanen; S. Hietanen;Abstract. Iron (Fe) plays a key role in sedimentary diagenetic processes in coastal systems, participating in various redox reactions and influencing the burial of organic carbon. Large amounts of Fe enter the marine environment from boreal river catchments associated with dissolved organic matter (DOM) and as colloidal Fe oxyhydroxides, principally ferrihydrite. However, the fate of this Fe pool in estuarine sediments has not been extensively studied. Here we show that flocculation processes along a salinity gradient in an estuary of the northern Baltic Sea efficiently transfer Fe and OM from the dissolved phase into particulate material that accumulates in the sediments. Flocculation of Fe and OM is partially decoupled. This is likely due to the presence of discrete colloidal ferrihydrite in the freshwater Fe pool, which responds differently from DOM to estuarine mixing. Further decoupling of Fe from OM occurs during sedimentation. While we observe a clear decline with distance offshore in the proportion of terrestrial material in the sedimentary particulate organic matter (POM) pool, the distribution of flocculated Fe in sediments is modulated by focusing effects. Labile Fe phases are most abundant at a deep site in the inner basin of the estuary, consistent with input from flocculation and subsequent focusing. The majority of the labile Fe pool is present as Fe (II), including both acid-volatile sulfur (AVS)-bound Fe and unsulfidized phases. The ubiquitous presence of unsulfidized Fe (II) throughout the sediment column suggests Fe (II)-OM complexes derived from reduction of flocculated Fe (III)-OM, while other Fe (II) phases are likely derived from the reduction of flocculated ferrihydrite. Depth-integrated rates of Fe (II) accumulation (AVS-Fe + unsulfidized Fe (II) + pyrite) for the period 1970–2015 are greater in the inner basin of the estuary with respect to a site further offshore, confirming higher rates of Fe reduction in near-shore areas. Mössbauer 57Fe spectroscopy shows that refractory Fe is composed largely of superparamagnetic Fe (III), high-spin Fe (II) in silicates, and, at one station, also oxide minerals derived from past industrial activities. Our results highlight that the cycling of Fe in boreal estuarine environments is complex, and that the partial decoupling of Fe from OM during flocculation and sedimentation is key to understanding the role of Fe in sedimentary diagenetic processes in coastal areas.
Biogeosciences; PURE... arrow_drop_down HELDA - Digital Repository of the University of HelsinkiArticle . 2018 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bg-15-1243-2018&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 51 citations 51 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Biogeosciences; PURE... arrow_drop_down HELDA - Digital Repository of the University of HelsinkiArticle . 2018 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bg-15-1243-2018&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2021 FinlandPublisher:Elsevier BV Funded by:AKA | Partial melting processes...AKA| Partial melting processes in the contact zones of layered intrusionsKimmo Kärenlampi; Jussi S. Heinonen; Asko Kontinen; Eero Hanski; Hannu Huhma;The origin of ferroan A-type granites in anorogenic tectonic settings remains a long-standing petrological puzzle. The proposed models range from extreme fractional crystallization of mantle-derived magmas to partial melting of crustal rocks, or involve combination of both. In this study, we apply whole-rock chemical and Sm-Nd isotopic compositions and thermodynamically constrained modeling (Magma Chamber Simulator, MCS) to decipher the genesis of a suite of A1-type peralkaline to peraluminous granites and associated intermediate rocks (monzodiorite-monzonite, syenite) from the southwestern margin of the Archean Karelia craton, central Finland, Fennoscandian Shield. These plutonic rocks were emplaced at ca. 2.05 Ga during an early stage of the break-up of the Karelia craton along its western margin and show trace element affinities to ocean island basalt-type magmas. The intermediate rocks show positive epsilon Nd(2050 Ma) values (+1.3 to +2.6), which are only slightly lower than the estimated contemporaneous depleted mantle value (+3.4), but much higher than average epsilon Nd(2050 Ma) of Archean TTGs (-10) in the surrounding bedrock, indicating that these rocks were essentially derived from a mantle source. The epsilon Nd(2050 Ma) values of the peralkaline and peraluminous granite samples overlap (-0.9 to +0.6 and -3.2 to +0.9, respectively) and are somewhat lower than those in the intermediate rocks, suggesting that the mafic magmas parental to granite must have assimilated some amount of older Archean continental crust during their fractionation, which is consistent with the continental crust-like trace element signatures of the granite members. The MCS modeling indicates that fractional crystallization of mantle-derived magmas can explain the major element characteristics of the intermediate rocks. The generation of the granites requires further fractional crystallization of these magmas coupled with assimilation of Archean crust. These processes took place in the middle to upper crust (-2-4 kbar, -7-15 km) and involved crystallization of large amounts of clinopyroxene, plagioclase and olivine. Our results highlight the importance of coupled FC-AFC processes in the petrogenesis of A-type magmas and support the general perception that magmas of A-type ferroan granites become more peraluminous by assimilation of crust. They further suggest that variable fractionation paths of the magmas upon the onset of assimilation may explain the broad variety of A-type felsic and intermediate igneous rocks that is often observed emplaced closely in time and space within the same igneous complex. Peer reviewed
University of Oulu R... arrow_drop_down University of Oulu Repository - JultikaArticle . 2021License: CC BYData sources: University of Oulu Repository - JultikaHELDA - Digital Repository of the University of HelsinkiArticle . 2021 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.chemer.2020.125734&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routeshybrid 7 citations 7 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert University of Oulu R... arrow_drop_down University of Oulu Repository - JultikaArticle . 2021License: CC BYData sources: University of Oulu Repository - JultikaHELDA - Digital Repository of the University of HelsinkiArticle . 2021 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.chemer.2020.125734&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type , Preprint 2020 FinlandPublisher:Copernicus GmbH Funded by:AKA | Finnish Center for Artifi..., EC | ERA-PLANET, AKA | Structure from randomizat...AKA| Finnish Center for Artificial Intelligence (FCAI) / Consortium: FCAI ,EC| ERA-PLANET ,AKA| Structure from randomizationM. Lange; H. Suominen; M. Kurppa; L. Järvi; L. Järvi; E. Oikarinen; R. Savvides; K. Puolamäki; K. Puolamäki;Running large-eddy simulations (LESs) can be burdensome and computationally too expensive from the application point of view, for example, to support urban planning. In this study, regression models are used to replicate modelled air pollutant concentrations from LES in urban boulevards. We study the performance of regression models and discuss how to detect situations where the models are applied outside their training domain and their outputs cannot be trusted. Regression models from 10 different model families are trained and a cross-validation methodology is used to evaluate their performance and to find the best set of features needed to reproduce the LES outputs. We also test the regression models on an independent testing dataset. Our results suggest that in general, log-linear regression gives the best and most robust performance on new independent data. It clearly outperforms the dummy model which would predict constant concentrations for all locations (multiplicative minimum RMSE (mRMSE) of 0.76 vs. 1.78 of the dummy model). Furthermore, we demonstrate that it is possible to detect concept drift, i.e. situations where the model is applied outside its training domain and a new LES run may be necessary to obtain reliable results. Regression models can be used to replace LES simulations in estimating air pollutant concentrations, unless higher accuracy is needed. In order to have reliable results, it is however important to do the model and feature selection carefully to avoid overfitting and to use methods to detect the concept drift.
Geoscientific Model ... arrow_drop_down Geoscientific Model DevelopmentOther literature type . Article . 2021 . Peer-reviewedLicense: CC BYGeoscientific Model Development (GMD)Other literature type . 2020Data sources: Copernicus PublicationsGeoscientific Model Development (GMD)Other literature type . 2021Data sources: Copernicus PublicationsHELDA - Digital Repository of the University of HelsinkiArticle . 2021 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkihttps://doi.org/10.5194/gmd-20...Preprint . 2020 . Peer-reviewedLicense: CC BYData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/gmd-2020-200&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 4 citations 4 popularity Top 10% influence Average impulse Average Powered by BIP!more_vert Geoscientific Model ... arrow_drop_down Geoscientific Model DevelopmentOther literature type . Article . 2021 . Peer-reviewedLicense: CC BYGeoscientific Model Development (GMD)Other literature type . 2020Data sources: Copernicus PublicationsGeoscientific Model Development (GMD)Other literature type . 2021Data sources: Copernicus PublicationsHELDA - Digital Repository of the University of HelsinkiArticle . 2021 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkihttps://doi.org/10.5194/gmd-20...Preprint . 2020 . Peer-reviewedLicense: CC BYData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/gmd-2020-200&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2020 FinlandPublisher:Royal Society of Chemistry (RSC) Funded by:AKA | Toward higher efficiencie..., AKA | From high-pressure, low-t..., AKA | Thermal unimolecular reac...AKA| Toward higher efficiencies and lower emissions using Indian-origin biofuels: Developing a predictive CFD model with well-validated reduced combustion kinetics for device-scale applications ,AKA| From high-pressure, low-temperature combustion chemistry experiments relevant to CI-engines to a synthesis of species important in OH-radical recycling reactions in atmosphere; formation and decomposition of ketohydroperoxides and hydroperoxy-aldehyd ,AKA| Thermal unimolecular reaction kinetics of stabilized Criegee intermediates (sCI): construction and utilization of time-resolved broadband cavity-enhanced absorption spectrometer for direct investigations of temperature-dependent sCI reactionsAuthors: Jari Peltola; Prasenjit Seal; Anni Inkilä; Arkke J. Eskola;Jari Peltola; Prasenjit Seal; Anni Inkilä; Arkke J. Eskola;doi: 10.1039/d0cp00302f
We present a time-resolved broadband cavity-enhanced UV-absorption spectrometer apparatus that we have constructed and utilized for temperature- and pressure-dependent kinetic measurements of formaldehyde oxide (CH2OO) reactions. We also introduce and utilize a new photolytic precursor, bromoiodomethane (CH2IBr), which photolysis at 213 nm in presence of O2 produces CH2OO. Importantly, this precursor appears to be free from secondary reactions that may regenerate CH2OO in kinetic experiments. The unimolecular decomposition rate coefficient of CH2OO has been measured over wide pressure (5–400 Torr) and temperature (296–600 K) ranges and master equation simulations of the decomposition kinetics have been performed using MESMER program. The MESMER simulations of the experimental data with the calculated zero-point energy corrected transition state energy 85.9 kJ mol−1 for decomposition required no adjustment and returned 〈ΔE〉down = 123.2 × (T/298 K)0.74 cm−1 for temperature-dependent exponential-down model of the collisional energy transfer in He. A very good agreement between results of simulations and experiments is obtained. The results are compared with the previously reported unimolecular decomposition study by Stone et al. (Phys. Chem. Chem. Phys., 2018, 20, 24940–24954). Current master equation simulations suggest about 61% decomposition yield for the predominant H2 + CO2 channel, whereas the yields of two other channels, H2O + CO, and HCO + OH, are sensitive on the parameters involved in the simulations. The kinetics of CH2OO reaction with formic acid has also been investigated as function of pressure (5–150 Torr) and temperature (296–458 K). The bimolecular rate coefficient for CH2OO + HCOOH reaction shows a negative temperature dependency, decreasing from (1.0 ± 0.03) × 10−10 cm3 molecule−1 s−1 at 296 K to (0.47 ± 0.05) × 10−10 cm3 molecule−1 s−1 at 458 K with an Arrhenius activation energy of −4.9 ± 1.6 kJ mol−1, where statistical uncertainties shown are 2σ. Estimated overall uncertainty in the measured rate coefficients is about ±20%. Current bimolecular rate coefficient at room temperature agrees with the previously reported rate coefficients from the direct kinetic experiments. The reaction is found to be pressure independent over the range between 5 and 150 Torr at 296 K in He. We present a time-resolved broadband cavity-enhanced UV-absorption spectrometer apparatus that we have constructed and utilized for temperature- and pressure-dependent kinetic measurements of formaldehyde oxide (CH2OO) reactions. We also introduce and utilize a new photolytic precursor, bromoiodomethane (CH2IBr), which photolysis at 213 nm in presence of O-2 produces CH2OO. Importantly, this precursor appears to be free from secondary reactions that may regenerate CH2OO in kinetic experiments. The unimolecular decomposition rate coefficient of CH2OO has been measured over wide pressure (5-400 Torr) and temperature (296-600 K) ranges and master equation simulations of the decomposition kinetics have been performed using MESMER program. The MESMER simulations of the experimental data with the calculated zero-point energy corrected transition state energy 85.9 kJ mol(-1) for decomposition required no adjustment and returned (down) = 123.2 x (T/298 K)(0.74) cm(-1) for temperature-dependent exponential-down model of the collisional energy transfer in He. A very good agreement between results of simulations and experiments is obtained. The results are compared with the previously reported unimolecular decomposition study by Stone et al. (Phys. Chem. Chem. Phys., 2018, 20, 24940-24954). Current master equation simulations suggest about 61% decomposition yield for the predominant H-2 + CO2 channel, whereas the yields of two other channels, H2O + CO, and HCO + OH, are sensitive on the parameters involved in the simulations. The kinetics of CH2OO reaction with formic acid has also been investigated as function of pressure (5-150 Torr) and temperature (296-458 K). The bimolecular rate coefficient for CH2OO + HCOOH reaction shows a negative temperature dependency, decreasing from (1.0 +/- 0.03) x 10(-10) cm(3) molecule(-1) s(-1) at 296 K to (0.47 +/- 0.05) x 10(-10) cm(3) molecule(-1) s(-1) at 458 K with an Arrhenius activation energy of -4.9 +/- 1.6 kJ mol(-1), where statistical uncertainties shown are 2 sigma. Estimated overall uncertainty in the measured rate coefficients is about +/- 20%. Current bimolecular rate coefficient at room temperature agrees with the previously reported rate coefficients from the direct kinetic experiments. The reaction is found to be pressure independent over the range between 5 and 150 Torr at 296 K in He. Peer reviewed
Physical Chemistry C... arrow_drop_down Physical Chemistry Chemical PhysicsArticle . 2020 . Peer-reviewedLicense: CC BYData sources: CrossrefHELDA - Digital Repository of the University of HelsinkiArticle . 2020 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1039/d0cp00302f&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routeshybrid 12 citations 12 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Physical Chemistry C... arrow_drop_down Physical Chemistry Chemical PhysicsArticle . 2020 . Peer-reviewedLicense: CC BYData sources: CrossrefHELDA - Digital Repository of the University of HelsinkiArticle . 2020 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1039/d0cp00302f&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2018 GermanyPublisher:Wiley Funded by:AKA | Past climate change recor...AKA| Past climate change recorded by annually laminated lake sedimentsMarkus Czymzik; Eeva Haltia; Saija Saarni; Timo Saarinen; Achim Brauer;doi: 10.1111/bor.12315
Sediment microfacies, geochemical μ‐XRF and X‐ray density analyses were conducted on varved sediments from Lake Kortejärvi (eastern Finland) covering the last 2700 years. The varves comprise couplets of detrital and organic sub‐layers throughout the complete time‐span. Based on their microfacies and stratigraphical position within a varve as well as comparisons with local discharge and meteorological data, thicker detrital layers are interpreted to reflect intensified snow‐melt floods following more humid winters. Detailed comparisons with monthly to annually resolved North Atlantic Oscillation (NAO) indices back to AD 1049 (901 a BP) suggest that multidecadal increases in snow‐melt layer thickness tend to be connected with a more positive phase of the NAO and, consequently, warmer winters. In contrast, distinct centennial intervals of thicker snow‐melt layers from −40 to 170, 280 to 460 and 1900 to 2300 a BP as well as around 2600 a BP do not consistently correspond to a particular NAO phase, but coincide with extended sea‐ice margins and a colder North Atlantic climate, causing intensified and southward shifted westerly cyclones. Our results point to a differential modification of North Atlantic winter hydroclimate working on varying time scales.
GFZ German Research ... arrow_drop_down GFZ German Research Centre for GeosciencesArticle . 2018Data sources: GFZ German Research Centre for GeosciencesGFZ German Research Centre for GeosciencesArticle . 2018Data sources: GFZ German Research Centre for Geosciencesadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1111/bor.12315&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu6 citations 6 popularity Top 10% influence Average impulse Average Powered by BIP!more_vert GFZ German Research ... arrow_drop_down GFZ German Research Centre for GeosciencesArticle . 2018Data sources: GFZ German Research Centre for GeosciencesGFZ German Research Centre for GeosciencesArticle . 2018Data sources: GFZ German Research Centre for Geosciencesadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1111/bor.12315&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2021Funded by:AKA | Global health risks relat...AKA| Global health risks related to atmospheric composition and weather / Consortium: GLORIAAuthors: Marko Korhonen; Jouni Jaakkola;Marko Korhonen; Jouni Jaakkola;AbstractWe studied globally representative data to quantify how daily fine particulate matter (PM2.5) concentrations influence both daily stock market returns and volatility. Time-series analysis was applied on 47 city-level environmental and economic datasets and meta-analysis of the city-specific estimates was used to generate a global summary effect estimate. We found that, on average, a 10 μg/m3 increase in PM2.5 reduces same day returns by 1.2% (regression coefficient: − 0.012, 95% confidence interval: − 0.021, − 0.003) Based on a meta-regression, these associations are stronger in areas where the average PM2.5 concentrations are lower, the mean returns are higher, and where the local stock market capitalization is low. Our results suggest that a 10 μg/m3 increase in PM2.5 exposure increases stock market volatility by 0.2% (regression coefficient 0.002, 95% CI 0.000, 0.004), but the city-specific estimates were heterogeneous. Meta-regression analysis did not explain much of the between-city heterogeneity. Our results provide global evidence that short-term exposure to air pollution both reduces daily stock market returns and increases volatility.
Scientific Reports; ... arrow_drop_down Scientific Reports; OpenAPC Global InitiativeArticle . Conference object . 2021 . Peer-reviewedLicense: CC BYadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1038/s41598-021-88041-w&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 1 citations 1 popularity Average influence Average impulse Average Powered by BIP!more_vert Scientific Reports; ... arrow_drop_down Scientific Reports; OpenAPC Global InitiativeArticle . Conference object . 2021 . Peer-reviewedLicense: CC BYadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1038/s41598-021-88041-w&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu
Loading
description Publicationkeyboard_double_arrow_right Article 2019 Finland EnglishPublisher:Public Library of Science (PLoS) Funded by:AKA | Multilevel assessment of ..., AKA | Multilevel assessment of ...AKA| Multilevel assessment of sustainable oil spill response measures and their impact on Arctic and subarctic marine environments (OILRES) / Consortium: OILRES ,AKA| Multilevel assessment of sustainable oil spill response measures and their impact on Arctic and subarctic marine environments (OILRES) / Consortium: OILRESMiettinen, Hanna; Bomberg, Malin; Nyyssönen, Mari; Reunamo, Anna; Jørgensen, Kirsten S.; Vikman, Minna;pmc: PMC6605675
pmid: 31265451
Two long-term potentially oil exposed Baltic Sea coastal sites near old oil refineries and harbours were compared to nearby less exposed sites in terms of bacterial, archaeal and fungal microbiomes and oil degradation potential. The bacterial, archaeal and fungal diversities were similar in oil exposed and less exposed sampling sites based on bacterial and archaeal 16S rRNA gene and fungal 5.8S rRNA gene amplicon sequencing from both DNA and RNA fractions. The number of genes participating in alkane degradation (alkB) or PAH-ring hydroxylation (PAH–RHDα) were detected by qPCR in all water and sediment samples. These numbers correlated with the number of bacterial 16S rRNA gene copies in sediment samples but not with the concentration of petroleum hydrocarbons or PAHs. This indicates that both the clean and the more polluted sites at the Baltic Sea coastal areas have a potential for petroleum hydrocarbon degradation. The active community (based on RNA) of the coastal Baltic Sea water differed largely from the total community (based on DNA). The most noticeable difference was seen in the bacterial community in the water samples were the active community was dominated by Cyanobacteria and Proteobacteria whereas in total bacterial community Actinobacteria was the most abundant phylum. The abundance, richness and diversity of Fungi present in water and sediment samples was in general lower than that of Bacteria and Archaea. Furthermore, the sampling location influenced the fungal community composition, whereas the bacterial and archaeal communities were not influenced. This may indicate that the fungal species that are adapted to the Baltic Sea environments are few and that Fungi are potentially more vulnerable to or affected by the Baltic Sea conditions than Bacteria and Archaea.
Europe PubMed Centra... arrow_drop_down Europe PubMed CentralArticle . 2019Full-Text: http://europepmc.org/articles/PMC6605675Data sources: PubMed CentralHELDA - Digital Repository of the University of HelsinkiArticle . 2019Data sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=PMC6605675&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 14 citations 14 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Europe PubMed Centra... arrow_drop_down Europe PubMed CentralArticle . 2019Full-Text: http://europepmc.org/articles/PMC6605675Data sources: PubMed CentralHELDA - Digital Repository of the University of HelsinkiArticle . 2019Data sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=PMC6605675&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Other literature type , Article 2016 United States, Switzerland, France, Finland, France, FinlandPublisher:American Association for the Advancement of Science (AAAS) Funded by:EC | nanoCAVa, AKA | Formation and growth of a..., AKA | ATMOSPHERIC SCIENCES - Pa... +16 projectsEC| nanoCAVa ,AKA| Formation and growth of atmospheric aerosol particles: from molecular to global scale ,AKA| ATMOSPHERIC SCIENCES - Particularly for determination of cluster and nanoaerosol composition ,AKA| Measurement of Nano-particle Nucelation in the Atmosphere via Cluster Ion Mass Spectrometry ,FCT| Collaboration in the CLOUD experiment ,SNSF| Investigation of new particle formation in the CLOUD chamber at CERN and the PSI smog chamber ,AKA| Nanoaerosol synthesis for bridging laboratory and field investigations of new particle formation and growth ,AKA| Formation and growth of atmospheric aerosol particles: from molecular to global scale ,FWF| Chemical Characterization of Organic Nanoparticles ,UKRI| E-Infrastructure Interconnectivity EPSRC - Chris Taylor ,AKA| Infrastructure of Environmental and Atmospheric Sciences (ATM-Science) ,SNSF| CLOUD ,SNSF| FORCE Proposal to Investigation of Secondary Organic Aerosol Formation in the PSI Smog Chamber and at CERN ,EC| ATMNUCLE ,AKA| Computational research chain from quantum chemistry to climate change / Consortium: ComQuaCC ,AKA| Nucleation of particles and ice in the atmosphere: from surface layer to upper troposphere ,SNSF| Investigation of Secondary Organic Aerosol Formation in the PSI Smog Chamber and at CERN ,UKRI| Global Aerosol Synthesis and Science Project (GASSP) to reduce the uncertainty in aerosol radiative forcing ,SNSF| Molecular Imaging of CNS-Immune System Interactions in Multiple SclerosisEimear M. Dunne; Hamish Gordon; Andreas Kürten; Joao Almeida; Jonathan Duplissy; Christina Williamson; Ismael K. Ortega; Kirsty J. Pringle; Alexey Adamov; Urs Baltensperger; Peter Barmet; Francois Benduhn; F. Bianchi; Martin Breitenlechner; Antony D. Clarke; Joachim Curtius; Josef Dommen; Neil M. Donahue; Sebastian Ehrhart; Richard C. Flagan; Alessandro Franchin; Roberto Guida; Jani Hakala; Armin Hansel; Martin Heinritzi; Tuija Jokinen; Juha Kangasluoma; Jasper Kirkby; Markku Kulmala; Agnieszka Kupc; Michael J. Lawler; Katrianne Lehtipalo; Vladimir Makhmutov; Graham Mann; Serge Mathot; Joonas Merikanto; Pasi Miettinen; Athanasios Nenes; Antti Onnela; Alexandru Rap; Carly Reddington; Francesco Riccobono; N. A. D. Richards; Matti P. Rissanen; Linda Rondo; Nina Sarnela; Siegfried Schobesberger; Kamalika Sengupta; Mario Simon; Mikko Sipilä; James N. Smith; Yuri Stozkhov; António Tomé; Jasmin Tröstl; Paul E. Wagner; Daniela Wimmer; Paul M. Winkler; Douglas R. Worsnop; Kenneth S. Carslaw;pmid: 27789796
New particle formation in the atmosphere produces around half of the cloud condensation nuclei that seed cloud droplets. Such particles have a pivotal role in determining the properties of clouds and the global radiation balance. Dunne et al. used the CLOUD (Cosmics Leaving Outdoor Droplets) chamber at CERN to construct a model of aerosol formation based on laboratory measured nucleation rates. They found that nearly all nucleation involves either ammonia or biogenic organic compounds. Furthermore in the present day atmosphere cosmic ray intensity cannot meaningfully affect climate via nucleation.Science this issue p. 1119Fundamental questions remain about the origin of newly formed atmospheric aerosol particles because data from laboratory measurements have been insufficient to build global models. In contrast gas phase chemistry models have been based on laboratory kinetics measurements for decades. We built a global model of aerosol formation by using extensive laboratory measurements of rates of nucleation involving sulfuric acid ammonia ions and organic compounds conducted in the CERN CLOUD (Cosmics Leaving Outdoor Droplets) chamber. The simulations and a comparison with atmospheric observations show that nearly all nucleation throughout the present day atmosphere involves ammonia or biogenic organic compounds in addition to sulfuric acid. A considerable fraction of nucleation involves ions but the relatively weak dependence on ion concentrations indicates that for the processes studied variations in cosmic ray intensity do not appreciably affect climate through nucleation in the present day atmosphere.U http://science.sciencemag.org/content/sci/354/6316/1119.full.pdf
Science arrow_drop_down ScienceOther literature type . Article . 2016 . Peer-reviewedCaltech AuthorsArticle . 2016 . Peer-reviewedFull-Text: https://authors.library.caltech.edu/71775/5/Global%20atmospheric%20particle%20formation.pdfData sources: Caltech AuthorsInfoscience - EPFL scientific publicationsOther literature typeData sources: Infoscience - EPFL scientific publicationsadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1126/science.aaf2649&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesbronze 276 citations 276 popularity Top 1% influence Top 10% impulse Top 1% Powered by BIP!visibility 34visibility views 34 download downloads 740 Powered bymore_vert Science arrow_drop_down ScienceOther literature type . Article . 2016 . Peer-reviewedCaltech AuthorsArticle . 2016 . Peer-reviewedFull-Text: https://authors.library.caltech.edu/71775/5/Global%20atmospheric%20particle%20formation.pdfData sources: Caltech AuthorsInfoscience - EPFL scientific publicationsOther literature typeData sources: Infoscience - EPFL scientific publicationsadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1126/science.aaf2649&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2019 EnglishPublisher:Copernicus Publications Funded by:EC | EUROCHAMP-2020, AKA | Centre of Excellence in A..., EC | QAPPAEC| EUROCHAMP-2020 ,AKA| Centre of Excellence in Atmospheric Science From Molecular and Biolocigal processes to The Global Climate ,EC| QAPPAE. Kari; E. Kari; L. Hao; A. Ylisirniö; A. Buchholz; A. Leskinen; A. Leskinen; P. Yli-Pirilä; I. Nuutinen; I. Nuutinen; K. Kuuspalo; K. Kuuspalo; J. Jokiniemi; C. L. Faiola; C. L. Faiola; S. Schobesberger; A. Virtanen;The fraction of gasoline direct-injection (GDI) vehicles comprising the total vehicle pool is projected to increase in the future. However, thorough knowledge about the influence of GDI engines on important atmospheric chemistry processes is missing – namely, their contribution to secondary organic aerosol (SOA) precursor emissions, contribution to SOA formation, and potential role in biogenic–anthropogenic interactions. The objectives of this study were to (1) characterize emissions from modern GDI vehicles and investigate their role in SOA formation chemistry and (2) investigate biogenic–anthropogenic interactions related to SOA formation from a mixture of GDI-vehicle emissions and a model biogenic compound, α-pinene. Specifically, we studied SOA formation from modern GDI-vehicle emissions during the constant-load driving. In this study we show that SOA formation from GDI-vehicle emissions was observed in each experiment. Volatile organic compounds (VOCs) measured with the proton-transfer-reaction time-of-flight mass spectrometer (PTR-ToF-MS) could account for 19 %–42 % of total SOA mass generated in each experiment. This suggests that there were lower-volatility intermediate VOCs (IVOCs) and semi-volatile organic compounds (SVOCs) in the GDI-vehicle exhaust that likely contributed to SOA production but were not detected with the instrumentation used in this study. This study also demonstrates that two distinct mechanisms caused by anthropogenic emissions suppress α-pinene SOA mass yield. The first suppressing effect was the presence of NOx. This mechanism is consistent with previous reports demonstrating suppression of biogenic SOA formation in the presence of anthropogenic emissions. Our results indicate a possible second suppressing effect, and we suggest that the presence of anthropogenic gas-phase species may have suppressed biogenic SOA formation by alterations to the gas-phase chemistry of α-pinene. This hypothesized change in oxidation pathways led to the formation of α-pinene oxidation products that most likely did not have vapor pressures low enough to partition into the particle phase. Overall, the presence of gasoline-vehicle exhaust caused a more than 50 % suppression in α-pinene SOA mass yield compared to the α-pinene SOA mass yield measured in the absence of any anthropogenic influence.
All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=doajarticles::26f2c058a568c65c1abf5f1c252956bc&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 0 citations 0 popularity Average influence Average impulse Average Powered by BIP!more_vert All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=doajarticles::26f2c058a568c65c1abf5f1c252956bc&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2023 FinlandPublisher:Copernicus GmbH Funded by:AKA | Where does water go when ..., AKA | Integrated Biodiversity C..., EC | CHARTER +1 projectsAKA| Where does water go when snow melts? New spatio-temporal resolution in stable water isotopes measurements to inform cold climate hydrological modelling ,AKA| Integrated Biodiversity Conservation and Carbon Sequestration in the Changing Environment (IBC-CARBON) / Consortium: IBC-CARBON ,EC| CHARTER ,AKA| Land use as a modulator of land cover transitions and the ecosystem–atmosphere carbon balance (LANDMOD)L.-J. Meriö; L.-J. Meriö; A. Rauhala; P. Ala-aho; A. Kuzmin; P. Korpelainen; T. Kumpula; B. Kløve; H. Marttila;Detailed information on seasonal snow cover and depth is essential to the understanding of snow processes, to operational forecasting, and as input for hydrological models. Recent advances in uncrewed or unmanned aircraft systems (UASs) and structure from motion (SfM) techniques have enabled low-cost monitoring of spatial snow depth distribution in resolutions of up to a few centimeters. Here, we study the spatiotemporal variability in snow depth and interactions between snow and vegetation in different subarctic landscapes consisting of a mosaic of conifer forest, mixed forest, transitional woodland/shrub, and peatland areas. To determine the spatiotemporal variability in snow depth, we used high-resolution (50 cm) snow depth maps generated from repeated UAS–SfM surveys in the winter of 2018/2019 and a snow-free bare-ground survey after snowmelt. Due to poor subcanopy penetration with the UAS–SfM method, tree masks were utilized to remove canopy areas and the area (36 cm) immediately next to the canopy before analysis. Snow depth maps were compared to the in situ snow course and a single-point continuous ultrasonic snow depth measurement. Based on the results, the difference between the UAS–SfM survey median snow depth and single-point measurement increased for all land cover types during the snow season, from +5 cm at the beginning of the accumulation to −16 cm in coniferous forests and −32 cm in peatland during the melt period. This highlights the poor representation of point measurements in selected locations even on the subcatchment scale. The high-resolution snow depth maps agreed well with the snow course measurement, but the spatial extent and resolution of maps were substantially higher. The snow depth range (5th–95th percentiles) within different land cover types increased from 17 to 42 cm in peatlands and from 33 to 49 cm in the coniferous forest from the beginning of the snow accumulation to the melt period. Both the median snow depth and its range were found to increase with canopy density; this increase was greatest in the conifer forest area, followed by mixed forest, transitional woodland/shrub, and open peatlands. Using the high-spatial-resolution data, we found a systematic increase (2–20 cm) and then a decline in snow depth near the canopy with increasing distance (from 1 to 2.5 m) of the peak value through the snow season. This study highlights the applicability of the UAS–SfM in high-resolution monitoring of snow depth in multiple land cover types and snow–vegetation interactions in subarctic and remote areas where field data are not available or where the available data are collected using classic point measurements or snow courses.
The Cryosphere (TC) arrow_drop_down University of Oulu Repository - JultikaArticle . 2023License: CC BYData sources: University of Oulu Repository - Jultikaadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/tc-17-4363-2023&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 1 citations 1 popularity Average influence Average impulse Average Powered by BIP!more_vert The Cryosphere (TC) arrow_drop_down University of Oulu Repository - JultikaArticle . 2023License: CC BYData sources: University of Oulu Repository - Jultikaadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/tc-17-4363-2023&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2018 Finland, DenmarkPublisher:Copernicus GmbH Funded by:AKA | Biogeochemical links betw..., AKA | Nitrogen processes in the...AKA| Biogeochemical links between climate change and eutrophication in the Baltic Sea ,AKA| Nitrogen processes in the water column of the Baltic SeaT. Jilbert; T. Jilbert; E. Asmala; E. Asmala; E. Asmala; C. Schröder; R. Tiihonen; R. Tiihonen; J.-P. Myllykangas; J.-P. Myllykangas; J. J. Virtasalo; A. Kotilainen; P. Peltola; P. Ekholm; S. Hietanen; S. Hietanen;Abstract. Iron (Fe) plays a key role in sedimentary diagenetic processes in coastal systems, participating in various redox reactions and influencing the burial of organic carbon. Large amounts of Fe enter the marine environment from boreal river catchments associated with dissolved organic matter (DOM) and as colloidal Fe oxyhydroxides, principally ferrihydrite. However, the fate of this Fe pool in estuarine sediments has not been extensively studied. Here we show that flocculation processes along a salinity gradient in an estuary of the northern Baltic Sea efficiently transfer Fe and OM from the dissolved phase into particulate material that accumulates in the sediments. Flocculation of Fe and OM is partially decoupled. This is likely due to the presence of discrete colloidal ferrihydrite in the freshwater Fe pool, which responds differently from DOM to estuarine mixing. Further decoupling of Fe from OM occurs during sedimentation. While we observe a clear decline with distance offshore in the proportion of terrestrial material in the sedimentary particulate organic matter (POM) pool, the distribution of flocculated Fe in sediments is modulated by focusing effects. Labile Fe phases are most abundant at a deep site in the inner basin of the estuary, consistent with input from flocculation and subsequent focusing. The majority of the labile Fe pool is present as Fe (II), including both acid-volatile sulfur (AVS)-bound Fe and unsulfidized phases. The ubiquitous presence of unsulfidized Fe (II) throughout the sediment column suggests Fe (II)-OM complexes derived from reduction of flocculated Fe (III)-OM, while other Fe (II) phases are likely derived from the reduction of flocculated ferrihydrite. Depth-integrated rates of Fe (II) accumulation (AVS-Fe + unsulfidized Fe (II) + pyrite) for the period 1970–2015 are greater in the inner basin of the estuary with respect to a site further offshore, confirming higher rates of Fe reduction in near-shore areas. Mössbauer 57Fe spectroscopy shows that refractory Fe is composed largely of superparamagnetic Fe (III), high-spin Fe (II) in silicates, and, at one station, also oxide minerals derived from past industrial activities. Our results highlight that the cycling of Fe in boreal estuarine environments is complex, and that the partial decoupling of Fe from OM during flocculation and sedimentation is key to understanding the role of Fe in sedimentary diagenetic processes in coastal areas.
Biogeosciences; PURE... arrow_drop_down HELDA - Digital Repository of the University of HelsinkiArticle . 2018 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bg-15-1243-2018&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 51 citations 51 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Biogeosciences; PURE... arrow_drop_down HELDA - Digital Repository of the University of HelsinkiArticle . 2018 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/bg-15-1243-2018&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2021 FinlandPublisher:Elsevier BV Funded by:AKA | Partial melting processes...AKA| Partial melting processes in the contact zones of layered intrusionsKimmo Kärenlampi; Jussi S. Heinonen; Asko Kontinen; Eero Hanski; Hannu Huhma;The origin of ferroan A-type granites in anorogenic tectonic settings remains a long-standing petrological puzzle. The proposed models range from extreme fractional crystallization of mantle-derived magmas to partial melting of crustal rocks, or involve combination of both. In this study, we apply whole-rock chemical and Sm-Nd isotopic compositions and thermodynamically constrained modeling (Magma Chamber Simulator, MCS) to decipher the genesis of a suite of A1-type peralkaline to peraluminous granites and associated intermediate rocks (monzodiorite-monzonite, syenite) from the southwestern margin of the Archean Karelia craton, central Finland, Fennoscandian Shield. These plutonic rocks were emplaced at ca. 2.05 Ga during an early stage of the break-up of the Karelia craton along its western margin and show trace element affinities to ocean island basalt-type magmas. The intermediate rocks show positive epsilon Nd(2050 Ma) values (+1.3 to +2.6), which are only slightly lower than the estimated contemporaneous depleted mantle value (+3.4), but much higher than average epsilon Nd(2050 Ma) of Archean TTGs (-10) in the surrounding bedrock, indicating that these rocks were essentially derived from a mantle source. The epsilon Nd(2050 Ma) values of the peralkaline and peraluminous granite samples overlap (-0.9 to +0.6 and -3.2 to +0.9, respectively) and are somewhat lower than those in the intermediate rocks, suggesting that the mafic magmas parental to granite must have assimilated some amount of older Archean continental crust during their fractionation, which is consistent with the continental crust-like trace element signatures of the granite members. The MCS modeling indicates that fractional crystallization of mantle-derived magmas can explain the major element characteristics of the intermediate rocks. The generation of the granites requires further fractional crystallization of these magmas coupled with assimilation of Archean crust. These processes took place in the middle to upper crust (-2-4 kbar, -7-15 km) and involved crystallization of large amounts of clinopyroxene, plagioclase and olivine. Our results highlight the importance of coupled FC-AFC processes in the petrogenesis of A-type magmas and support the general perception that magmas of A-type ferroan granites become more peraluminous by assimilation of crust. They further suggest that variable fractionation paths of the magmas upon the onset of assimilation may explain the broad variety of A-type felsic and intermediate igneous rocks that is often observed emplaced closely in time and space within the same igneous complex. Peer reviewed
University of Oulu R... arrow_drop_down University of Oulu Repository - JultikaArticle . 2021License: CC BYData sources: University of Oulu Repository - JultikaHELDA - Digital Repository of the University of HelsinkiArticle . 2021 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.chemer.2020.125734&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routeshybrid 7 citations 7 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert University of Oulu R... arrow_drop_down University of Oulu Repository - JultikaArticle . 2021License: CC BYData sources: University of Oulu Repository - JultikaHELDA - Digital Repository of the University of HelsinkiArticle . 2021 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1016/j.chemer.2020.125734&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type , Preprint 2020 FinlandPublisher:Copernicus GmbH Funded by:AKA | Finnish Center for Artifi..., EC | ERA-PLANET, AKA | Structure from randomizat...AKA| Finnish Center for Artificial Intelligence (FCAI) / Consortium: FCAI ,EC| ERA-PLANET ,AKA| Structure from randomizationM. Lange; H. Suominen; M. Kurppa; L. Järvi; L. Järvi; E. Oikarinen; R. Savvides; K. Puolamäki; K. Puolamäki;Running large-eddy simulations (LESs) can be burdensome and computationally too expensive from the application point of view, for example, to support urban planning. In this study, regression models are used to replicate modelled air pollutant concentrations from LES in urban boulevards. We study the performance of regression models and discuss how to detect situations where the models are applied outside their training domain and their outputs cannot be trusted. Regression models from 10 different model families are trained and a cross-validation methodology is used to evaluate their performance and to find the best set of features needed to reproduce the LES outputs. We also test the regression models on an independent testing dataset. Our results suggest that in general, log-linear regression gives the best and most robust performance on new independent data. It clearly outperforms the dummy model which would predict constant concentrations for all locations (multiplicative minimum RMSE (mRMSE) of 0.76 vs. 1.78 of the dummy model). Furthermore, we demonstrate that it is possible to detect concept drift, i.e. situations where the model is applied outside its training domain and a new LES run may be necessary to obtain reliable results. Regression models can be used to replace LES simulations in estimating air pollutant concentrations, unless higher accuracy is needed. In order to have reliable results, it is however important to do the model and feature selection carefully to avoid overfitting and to use methods to detect the concept drift.
Geoscientific Model ... arrow_drop_down Geoscientific Model DevelopmentOther literature type . Article . 2021 . Peer-reviewedLicense: CC BYGeoscientific Model Development (GMD)Other literature type . 2020Data sources: Copernicus PublicationsGeoscientific Model Development (GMD)Other literature type . 2021Data sources: Copernicus PublicationsHELDA - Digital Repository of the University of HelsinkiArticle . 2021 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkihttps://doi.org/10.5194/gmd-20...Preprint . 2020 . Peer-reviewedLicense: CC BYData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/gmd-2020-200&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesgold 4 citations 4 popularity Top 10% influence Average impulse Average Powered by BIP!more_vert Geoscientific Model ... arrow_drop_down Geoscientific Model DevelopmentOther literature type . Article . 2021 . Peer-reviewedLicense: CC BYGeoscientific Model Development (GMD)Other literature type . 2020Data sources: Copernicus PublicationsGeoscientific Model Development (GMD)Other literature type . 2021Data sources: Copernicus PublicationsHELDA - Digital Repository of the University of HelsinkiArticle . 2021 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkihttps://doi.org/10.5194/gmd-20...Preprint . 2020 . Peer-reviewedLicense: CC BYData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.5194/gmd-2020-200&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2020 FinlandPublisher:Royal Society of Chemistry (RSC) Funded by:AKA | Toward higher efficiencie..., AKA | From high-pressure, low-t..., AKA | Thermal unimolecular reac...AKA| Toward higher efficiencies and lower emissions using Indian-origin biofuels: Developing a predictive CFD model with well-validated reduced combustion kinetics for device-scale applications ,AKA| From high-pressure, low-temperature combustion chemistry experiments relevant to CI-engines to a synthesis of species important in OH-radical recycling reactions in atmosphere; formation and decomposition of ketohydroperoxides and hydroperoxy-aldehyd ,AKA| Thermal unimolecular reaction kinetics of stabilized Criegee intermediates (sCI): construction and utilization of time-resolved broadband cavity-enhanced absorption spectrometer for direct investigations of temperature-dependent sCI reactionsAuthors: Jari Peltola; Prasenjit Seal; Anni Inkilä; Arkke J. Eskola;Jari Peltola; Prasenjit Seal; Anni Inkilä; Arkke J. Eskola;doi: 10.1039/d0cp00302f
We present a time-resolved broadband cavity-enhanced UV-absorption spectrometer apparatus that we have constructed and utilized for temperature- and pressure-dependent kinetic measurements of formaldehyde oxide (CH2OO) reactions. We also introduce and utilize a new photolytic precursor, bromoiodomethane (CH2IBr), which photolysis at 213 nm in presence of O2 produces CH2OO. Importantly, this precursor appears to be free from secondary reactions that may regenerate CH2OO in kinetic experiments. The unimolecular decomposition rate coefficient of CH2OO has been measured over wide pressure (5–400 Torr) and temperature (296–600 K) ranges and master equation simulations of the decomposition kinetics have been performed using MESMER program. The MESMER simulations of the experimental data with the calculated zero-point energy corrected transition state energy 85.9 kJ mol−1 for decomposition required no adjustment and returned 〈ΔE〉down = 123.2 × (T/298 K)0.74 cm−1 for temperature-dependent exponential-down model of the collisional energy transfer in He. A very good agreement between results of simulations and experiments is obtained. The results are compared with the previously reported unimolecular decomposition study by Stone et al. (Phys. Chem. Chem. Phys., 2018, 20, 24940–24954). Current master equation simulations suggest about 61% decomposition yield for the predominant H2 + CO2 channel, whereas the yields of two other channels, H2O + CO, and HCO + OH, are sensitive on the parameters involved in the simulations. The kinetics of CH2OO reaction with formic acid has also been investigated as function of pressure (5–150 Torr) and temperature (296–458 K). The bimolecular rate coefficient for CH2OO + HCOOH reaction shows a negative temperature dependency, decreasing from (1.0 ± 0.03) × 10−10 cm3 molecule−1 s−1 at 296 K to (0.47 ± 0.05) × 10−10 cm3 molecule−1 s−1 at 458 K with an Arrhenius activation energy of −4.9 ± 1.6 kJ mol−1, where statistical uncertainties shown are 2σ. Estimated overall uncertainty in the measured rate coefficients is about ±20%. Current bimolecular rate coefficient at room temperature agrees with the previously reported rate coefficients from the direct kinetic experiments. The reaction is found to be pressure independent over the range between 5 and 150 Torr at 296 K in He. We present a time-resolved broadband cavity-enhanced UV-absorption spectrometer apparatus that we have constructed and utilized for temperature- and pressure-dependent kinetic measurements of formaldehyde oxide (CH2OO) reactions. We also introduce and utilize a new photolytic precursor, bromoiodomethane (CH2IBr), which photolysis at 213 nm in presence of O-2 produces CH2OO. Importantly, this precursor appears to be free from secondary reactions that may regenerate CH2OO in kinetic experiments. The unimolecular decomposition rate coefficient of CH2OO has been measured over wide pressure (5-400 Torr) and temperature (296-600 K) ranges and master equation simulations of the decomposition kinetics have been performed using MESMER program. The MESMER simulations of the experimental data with the calculated zero-point energy corrected transition state energy 85.9 kJ mol(-1) for decomposition required no adjustment and returned (down) = 123.2 x (T/298 K)(0.74) cm(-1) for temperature-dependent exponential-down model of the collisional energy transfer in He. A very good agreement between results of simulations and experiments is obtained. The results are compared with the previously reported unimolecular decomposition study by Stone et al. (Phys. Chem. Chem. Phys., 2018, 20, 24940-24954). Current master equation simulations suggest about 61% decomposition yield for the predominant H-2 + CO2 channel, whereas the yields of two other channels, H2O + CO, and HCO + OH, are sensitive on the parameters involved in the simulations. The kinetics of CH2OO reaction with formic acid has also been investigated as function of pressure (5-150 Torr) and temperature (296-458 K). The bimolecular rate coefficient for CH2OO + HCOOH reaction shows a negative temperature dependency, decreasing from (1.0 +/- 0.03) x 10(-10) cm(3) molecule(-1) s(-1) at 296 K to (0.47 +/- 0.05) x 10(-10) cm(3) molecule(-1) s(-1) at 458 K with an Arrhenius activation energy of -4.9 +/- 1.6 kJ mol(-1), where statistical uncertainties shown are 2 sigma. Estimated overall uncertainty in the measured rate coefficients is about +/- 20%. Current bimolecular rate coefficient at room temperature agrees with the previously reported rate coefficients from the direct kinetic experiments. The reaction is found to be pressure independent over the range between 5 and 150 Torr at 296 K in He. Peer reviewed
Physical Chemistry C... arrow_drop_down Physical Chemistry Chemical PhysicsArticle . 2020 . Peer-reviewedLicense: CC BYData sources: CrossrefHELDA - Digital Repository of the University of HelsinkiArticle . 2020 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1039/d0cp00302f&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routeshybrid 12 citations 12 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Physical Chemistry C... arrow_drop_down Physical Chemistry Chemical PhysicsArticle . 2020 . Peer-reviewedLicense: CC BYData sources: CrossrefHELDA - Digital Repository of the University of HelsinkiArticle . 2020 . Peer-reviewedData sources: HELDA - Digital Repository of the University of Helsinkiadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1039/d0cp00302f&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2018 GermanyPublisher:Wiley Funded by:AKA | Past climate change recor...AKA| Past climate change recorded by annually laminated lake sedimentsMarkus Czymzik; Eeva Haltia; Saija Saarni; Timo Saarinen; Achim Brauer;doi: 10.1111/bor.12315
Sediment microfacies, geochemical μ‐XRF and X‐ray density analyses were conducted on varved sediments from Lake Kortejärvi (eastern Finland) covering the last 2700 years. The varves comprise couplets of detrital and organic sub‐layers throughout the complete time‐span. Based on their microfacies and stratigraphical position within a varve as well as comparisons with local discharge and meteorological data, thicker detrital layers are interpreted to reflect intensified snow‐melt floods following more humid winters. Detailed comparisons with monthly to annually resolved North Atlantic Oscillation (NAO) indices back to AD 1049 (901 a BP) suggest that multidecadal increases in snow‐melt layer thickness tend to be connected with a more positive phase of the NAO and, consequently, warmer winters. In contrast, distinct centennial intervals of thicker snow‐melt layers from −40 to 170, 280 to 460 and 1900 to 2300 a BP as well as around 2600 a BP do not consistently correspond to a particular NAO phase, but coincide with extended sea‐ice margins and a colder North Atlantic climate, causing intensified and southward shifted westerly cyclones. Our results point to a differential modification of North Atlantic winter hydroclimate working on varying time scales.
GFZ German Research ... arrow_drop_down GFZ German Research Centre for GeosciencesArticle . 2018Data sources: GFZ German Research Centre for GeosciencesGFZ German Research Centre for GeosciencesArticle . 2018Data sources: GFZ German Research Centre for Geosciencesadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1111/bor.12315&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu6 citations 6 popularity Top 10% influence Average impulse Average Powered by BIP!more_vert GFZ German Research ... arrow_drop_down GFZ German Research Centre for GeosciencesArticle . 2018Data sources: GFZ German Research Centre for GeosciencesGFZ German Research Centre for GeosciencesArticle . 2018Data sources: GFZ German Research Centre for Geosciencesadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1111/bor.12315&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2021Funded by:AKA | Global health risks relat...AKA| Global health risks related to atmospheric composition and weather / Consortium: GLORIAAuthors: Marko Korhonen; Jouni Jaakkola;Marko Korhonen; Jouni Jaakkola;AbstractWe studied globally representative data to quantify how daily fine particulate matter (PM2.5) concentrations influence both daily stock market returns and volatility. Time-series analysis was applied on 47 city-level environmental and economic datasets and meta-analysis of the city-specific estimates was used to generate a global summary effect estimate. We found that, on average, a 10 μg/m3 increase in PM2.5 reduces same day returns by 1.2% (regression coefficient: − 0.012, 95% confidence interval: − 0.021, − 0.003) Based on a meta-regression, these associations are stronger in areas where the average PM2.5 concentrations are lower, the mean returns are higher, and where the local stock market capitalization is low. Our results suggest that a 10 μg/m3 increase in PM2.5 exposure increases stock market volatility by 0.2% (regression coefficient 0.002, 95% CI 0.000, 0.004), but the city-specific estimates were heterogeneous. Meta-regression analysis did not explain much of the between-city heterogeneity. Our results provide global evidence that short-term exposure to air pollution both reduces daily stock market returns and increases volatility.
Scientific Reports; ... arrow_drop_down Scientific Reports; OpenAPC Global InitiativeArticle . Conference object . 2021 . Peer-reviewedLicense: CC BYadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1038/s41598-021-88041-w&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess RoutesGreen gold 1 citations 1 popularity Average influence Average impulse Average Powered by BIP!more_vert Scientific Reports; ... arrow_drop_down Scientific Reports; OpenAPC Global InitiativeArticle . Conference object . 2021 . Peer-reviewedLicense: CC BYadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.This Research product is the result of merged Research products in OpenAIRE.
You have already added works in your ORCID record related to the merged Research product.All Research productsarrow_drop_down <script type="text/javascript"> <!-- document.write('<div id="oa_widget"></div>'); document.write('<script type="text/javascript" src="https://www.openaire.eu/index.php?option=com_openaire&view=widget&format=raw&projectId=10.1038/s41598-021-88041-w&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu