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description Publicationkeyboard_double_arrow_right Article 2011Publisher:Elsevier BV Kirstin Werner; Robert F Spielhagen; Dorothea Bauch; H. Christian Hass; Evgeniya Kandiano; Katarzyna Zamelczyk;A multiproxy data set of an AMS radiocarbon dated 46 cm long sediment core from the continental margin off western Svalbard reveals multidecadal climatic variability during the past two millennia. Investigation of planktic and benthic stable isotopes, planktic foraminiferal fauna, and lithogenic parameters aims to unveil the Atlantic Water advection to the eastern Fram Strait by intensity, temperatures, and salinities. Atlantic Water has been continuously present at the site over the last 2,000 years. Superimposed on the increase in sea ice/icebergs, a strengthened intensity of Atlantic Water inflow and seasonal ice-free conditions were detected at ~ 1000 to 1200 AD, during the well-known Medieval Climate Anomaly (MCA). However, temperatures of the MCA never exceeded those of the 20th century. Since ~ 1400 AD significantly higher portions of ice rafted debris and high planktic foraminifer fluxes suggest that the site was located in the region of a seasonal highly fluctuating sea ice margin. A sharp reduction in planktic foraminifer fluxes around 800 AD and after 1730 AD indicates cool summer conditions with major influence of sea ice/icebergs. High amounts of the subpolar planktic foraminifer species Turborotalia quinqueloba in size fraction 150–250 μm indicate strengthened Atlantic Water inflow to the eastern Fram Strait already after ~ 1860 AD. Nevertheless surface conditions stayed cold well into the 20th century indicated by low planktic foraminiferal fluxes. Most likely at the beginning of the 20th century, cold conditions of the terminating Little Ice Age period persisted at the surface whereas warm and saline Atlantic Water already strengthened, hereby subsiding below the cold upper mixed layer. Surface sediments with high abundances of subpolar planktic foraminifers indicate a strong inflow of Atlantic Water providing seasonal ice-free conditions in the eastern Fram Strait during the last few decades.
Palaeogeography Pala... arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2011 . Peer-reviewedLicense: Elsevier TDMData 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.
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For further information contact us at helpdesk@openaire.euAccess Routesbronze 53 citations 53 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert Palaeogeography Pala... arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2011 . Peer-reviewedLicense: Elsevier TDMData 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=10.1016/j.palaeo.2011.05.030&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2004 GermanyPublisher:Elsevier BV Authors: Bobrov, Anatoly A.; Andreev, Andrei A.; Schirrmeister, Lutz; Siegert, Christine;Bobrov, Anatoly A.; Andreev, Andrei A.; Schirrmeister, Lutz; Siegert, Christine;Testate amoebae (Protozoa: Testacea) were studied in the Late Quaternary permafrost deposits in the Siberian Arctic (Bykovsky Peninsula of the Laptev Sea coast, 71°40′ –71°80′ N and 129°–129°30′ E). The Testacea associations studied reflect specific environmental conditions in paleocryosols, which were controlled by the local micro-relief as well as by regional climate conditions. In total, 86 species, varieties, and forms of testate amoebae were found in 38 Pleistocene and Holocene samples. The rhizopods indicate that soil conditions at ca. 53,000 14C years BP were probably rather similar to the modern cold and wet arctic tundra environment. More moisture and warmer soil conditions were relatively favorable for rhizopods ca. 45,300–43,000 14C years BP, but it was significantly drier at about 42,000 14C years BP. Drier and colder environmental conditions were also present about 39,300–35,000 14C years BP. The Late Pleistocene samples, radiocarbon dated to 33,000–12,000 years BP, are characterized by a low species diversity and density indicating that this period may have been extremely cold and dry. This conjecture is also supported by the polymorphism of some species. Hydrophilic Difflugia species (mostly obligate hydrobiotes) are broadly represented in the studied Holocene samples. The species composition and density of rhizopods in the majority of Holocene samples suggest wet and relatively warm conditions. Changes in rhizopod assemblages during the last 53,000 years were not very dramatic, mostly consisting of rare species and changes in the dominant species complexes during the Pleistocene and Holocene. However, these changes were more drastic during the Pleistocene. They were probably at least partly responsible for the disappearance of some rare testacean species such as Argynnia sp.
OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2004 . Peer-reviewedLicense: Elsevier TDMData 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=10.1016/j.palaeo.2004.02.012&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesbronze 44 citations 44 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2004 . Peer-reviewedLicense: Elsevier TDMData 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=10.1016/j.palaeo.2004.02.012&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 1989 GermanyPublisher:Elsevier BV Authors: Suess, Erwin; Whiticar, M. J.;Suess, Erwin; Whiticar, M. J.;Pore fluids extracted from near-surface sediments of the deformation front along the Oregon subduction zone have, in general, the dissolved nutrient pattern characteristic of bacterial sulfate reduction. However, in certain locations there are peculiar ammonium distributions and anomalously 13C-depleted dissolved ΣCO2. These carbon isotope and nutrient patterns are attributed to the concurrent microbially-mediated oxidation of sedimentary organic matter (POC) and methane (CH4) originating from depth. In contrast to the oxidation of sedimentary organic matter in the sulfate zone, utilization of methane as the carbon source by sulfate-reducing bacteria would generate only half as much total carbon dioxide for each mole of sulfate consumed and would not generate any dissolved ammonium. The isotopically light ΣCO2 released from methane oxidation depletes the total metabolic carbon dioxide pool. Therefore, NH4+, ΣCO2 and δ13C of interstitial carbon dioxide in these pore fluids distintcly reflect the combined contributions of each of the two carbon substrates undergoing mineralization; i.e. methane and sedimentary organic matter. By appropriately partitioning the nutrient and substrate relationships, we calculate that in the area of the marginal ridge of the Oregon subduction zone as much as 30% of the ΣCO2 in pore fluids may result from methane oxidation. The calculation also predicts that the carbon isotope signature of the carbon dioxide derived from methane is between −35‰ and −63‰ PDB. Such an isotopically light gas generated from within the accretionary complex could be the residue of a biogenic methane pool. Fluid advection is required to carry such methane from depth to the present near-surface sediments. This mechanism is consistent with large-scale, tectonically-induced fluid transport envisioned for accreted sediments of the world's convergent plate boundaries.
OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 1989 . Peer-reviewedLicense: Elsevier TDMData 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=10.1016/0031-0182(89)90033-3&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesbronze 130 citations 130 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 1989 . Peer-reviewedLicense: Elsevier TDMData 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=10.1016/0031-0182(89)90033-3&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2020 GermanyPublisher:Elsevier BV Rudenko, Оlga; Taldenkova, Еkaterina; Ovsepyan, Yaroslav; Stepanova, Аnna; Bauch, Henning A.;Highlights • Land-shelf interactions in vicinity to the Lena River delta since 6 cal. ka. • Arctic tundra and taiga zones drained by the Lena River form shelf pollen assemblages. • Warmer-than-present climatic conditions 6–4.5 cal. ka and subsequent gradual cooling. • Estuarine-like reversed (N to S) bottom current activity along submarine paleovalleys. • Principal diversion of the major Lena River outflows to the east since 0.5 cal. ka. Abstract Land-shelf interactions and related environmental changes were reconstructed for the past 6 cal. kyrs interpreting multiproxy records from the two AMS14C-dated sediment cores from the sites located to the north and northeast of the Lena River delta. Proxies used include terrestrial and aquatic palynomorphs, benthic/planktic foraminifers and ostracods paired with benthic δ18O and δ13C records of Haynesina orbiculare. The study focused on unravelling the relation between river runoff and the regional climate changes on the one hand, and its imprint on the shelf sea environment on timescales beyond the instrumental records on the other. The palynomorph records show that the Lena River outflow largely determined the composition of species associations and the magnitude of terrestrial matter influx from land. Pollen assemblages of the inner Laptev Sea shelf reflect complex pollen contribution of the Arctic tundra and remote taiga zones drained by the Lena River and indicate a vegetation response to warmer-than-present climatic conditions between 6.0 and 4.5 cal. ka and a subsequent gradual cooling. Fluvial influence in the records is manifested by (1) increases in sedimentation rates; (2) high influxes of pollen/spores and freshwater chlorophycean algae, wood and plant remains; (3) negative δ13C excursions due to the introduction of dissolved inorganic carbon (DIC) from river water. Episodes of enhanced freshwater influence in the surface water layers (fluvial events) correlate with positive benthic δ18O excursions and increasing representation of river-distal species among benthics. Altogether, this points to an estuarine-like reversed (north to south) bottom current activity along the submarine paleovalleys on the shelf. The most pronounced fluvial events are recognized at 5.3–5.9, 1.5 and <0.5 cal. ka. The oldest fluvial event coincides with the final stage of mid-Holocene climate warming. A fluvial event at 1.5 cal. ka is specifically strong at the northeastern site thus marking a direction change of the Lena River outflow at this time and the progressive protrusion of the delta. During the past 500 years distinct negative δ13C values at the northeastern site reflect enhanced riverine influence. It is therefore concluded that the unprecedented change in the δ13C trend corroborates the other evidence for a principal diversion of the major Lena River outflows into its present-day, easterly direction.
Palaeogeography Pala... arrow_drop_down OceanRep; Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2020 . Peer-reviewedLicense: Elsevier TDMadd 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.palaeo.2019.109502&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routesbronze 6 citations 6 popularity Top 10% influence Average impulse Average Powered by BIP!more_vert Palaeogeography Pala... arrow_drop_down OceanRep; Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2020 . Peer-reviewedLicense: Elsevier TDMadd 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.palaeo.2019.109502&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2020 Germany, Croatia, Croatia, ItalyPublisher:Elsevier BV Funded by:EC | GeoTwinnEC| GeoTwinnBrunović, Dea; Miko, Slobodan; Hasan, Ozren; Papatheodorou, George; Ilijanić, Nikolina; Miserocchi, Stefano; Correggiari, Annamaria; Geraga, Maria;Abstract The results of a comprehensive study of submerged paleoenvironments developed along the karstified eastern Adriatic coast during the Late Quaternary are presented in this study. The Losinj Channel is a drowned karst basin filled with sediments. A multi-proxy analysis of two sediment cores (LK-12 and LK-15) recovered from water depths of 62 and 64 m was conducted. We used magnetic susceptibility, grain size, mineralogy, XRF core scanning, organic and inorganic carbon, total nitrogen, and paleontological data, supplemented with AMS 14C dating results and high-resolution seismic data, to reconstruct the infill history of the Losinj basin during the Late Pleistocene and Holocene. Our findings include the first detailed description of the presumed Marine Isotope Stage (MIS) 5a marine sediment succession along the eastern Adriatic coast. Deposition in the brackish-to-freshwater lacustrine body (Losinj paleolake) occurred during MIS 3. Sea level lowstand that followed caused the formation of environmental conditions typical of a karst polje. The post-Last Glacial Maximum (LGM) sea level rise led to the establishment of a brackish marine lake with seawater seepage through the karstified sill at 13.7 cal kyr B.P. The transition to the present-day marine conditions commenced at 10.5 cal kyr B.P. Paleoenvironmental changes in the investigated area can be linked to the presence of a sill at −50 m depth that separates the Losinj basin from the Kvarneric Bay. The sill depth determines the isolation or inundation of the investigated basin in response to the changes in sea level. Paleoenvironments reacted sensitively to these changes, and therefore, the study area represents an ideal setting to track regional sea level and climate variabilty.
Repository of the Cr... arrow_drop_down Repository of the Croatian Geological SurveyArticle . 2020Data sources: Repository of the Croatian Geological SurveyOceanRep; Palaeogeography Palaeoclimatology PalaeoecologyOther literature type . Article . 2020 . Peer-reviewedLicense: Elsevier TDMCroatian Scientific Bibliography - CROSBIOther literature type . 2020Data sources: Croatian Scientific Bibliography - CROSBIadd 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.palaeo.2020.109587&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu30 citations 30 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Repository of the Cr... arrow_drop_down Repository of the Croatian Geological SurveyArticle . 2020Data sources: Repository of the Croatian Geological SurveyOceanRep; Palaeogeography Palaeoclimatology PalaeoecologyOther literature type . Article . 2020 . Peer-reviewedLicense: Elsevier TDMCroatian Scientific Bibliography - CROSBIOther literature type . 2020Data sources: Croatian Scientific Bibliography - CROSBIadd 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.palaeo.2020.109587&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2021 GermanyPublisher:Elsevier BV Zhengchuang Hui; Xuewen Zhou; Manuel Chevalier; Xiao Wei; Yanfang Pan; Yingyong Chen;Highlights: • A quantitative record of Miocene EASM from northern China was obtained. • The EASM stepwise decreased from ~17.1 Ma to 7.4 Ma and increased after ~7.4 Ma. • Middle Miocene EASM evolution is mainly regulating by temperature changes. • Palaeogeography play a key role in controlling the evolution of late Miocene EASM. Abstract The East Asian summer monsoon (EASM) precipitation is vital to hydrology, ecology and societal activities in the densely populated region of East Asia. However, its long-term evolution history and driving forces during the relatively warm Miocene remain unclear, even conflicting in some intervals. Here, we present a new, and quantitative record of EASM precipitation during Miocene using the Bayesian approach of Climate Reconstruction Software (CREST) based on pollen flora from the Tianshui Basin located on the northwestern Tibetan Plateau (TP). The results demonstrate that a strong and relatively stable EASM precipitation period occurred during the Neogene in northern China at ~17.1–13.6 Ma, which was followed by a strong and gradual decreasing period between ~13.6 and 7.4 Ma. This trend was abruptly stopped at ~7.4 Ma with the beginning of a period of large amplitude precipitation increase. The comparison analysis reveals that the gradual decrease of EASM precipitation during the period of ~17.1–7.4 Ma was primarily controlled by the global cooling, whereas the significant increase period after ~7.4 Ma was mainly related to the late Miocene uplift of the TP, supporting climate model simulations, in which both the global temperature and palaeogeography play important roles in regulating the long-term evolution of EASM precipitation.
OceanRep; Palaeogeog... arrow_drop_down OceanRep; Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2021 . Peer-reviewedLicense: CC BY NC NDServeur académique lausannoisArticle . 2021License: CC BY NC NDData sources: Serveur académique lausannoisadd 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.palaeo.2021.110609&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.euAccess Routeshybrid 13 citations 13 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert OceanRep; Palaeogeog... arrow_drop_down OceanRep; Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2021 . Peer-reviewedLicense: CC BY NC NDServeur académique lausannoisArticle . 2021License: CC BY NC NDData sources: Serveur académique lausannoisadd 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.palaeo.2021.110609&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2006 GermanyPublisher:Elsevier BV Hay, William W.; Migdisov, A.; Balukhovsky, A.N.; Wold, C.N.; Flögel, Sascha; Söding, Emanuel;A compilation of data on volumes and masses of evaporite deposits is used as the basis for reconstruction of the salinity of the ocean in the past. Chloride is tracked as the only ion essentially restricted to the ocean, and past salinities are calculated from reconstructed chlorine content of the ocean. Models for ocean salinity through the Phanerozoic are developed using maximal and minimal estimates of the volumes of existing evaporite deposits, and using constant and declining volumes of ocean water through the Phanerozoic. We conclude that there have been significant changes in the mean salinity of the ocean accompanying a general decline throughout the Phanerozoic. The greatest changes are related to major extractions of salt into the young ocean basins which developed during the Mesozoic as Pangaea broke apart. Unfortunately, the sizes of these salt deposits are also the least well known. The last major extractions of salt from the ocean occurred during the Miocene, shortly after the large scale extraction of water from the ocean to form the ice cap of Antarctica. However, these two modifications of the masses of H2O and salt in the ocean followed in sequence and did not cancel each other out. Accordingly, salinities during the Early Miocene were between 37‰ and 39‰. The Mesozoic was a time of generally declining salinity associated with the deep sea salt extractions of the North Atlantic and Gulf of Mexico (Middle to Late Jurassic) and South Atlantic (Early Cretaceous). The earliest of the major extractions of the Phanerozoic occurred during the Permian. There were few large extractions of salt during the earlier Palaeozoic. The models suggest that this was a time of relatively stable but slowly increasing salinities ranging through the upper 40‰'s into the lower 50‰'s. Higher salinities for the world ocean have profound consequences for the thermohaline circulation of the ocean in the past. In the modern ocean, with an average salinity of about 34.7‰, the density of water is only very slightly affected by cooling as it approaches the freezing point. Consequently, salinization through sea-ice formation or evaporation is usually required to make water dense enough to sink into the ocean interior. At salinities above about 40‰ water continues to become more dense as it approaches the freezing point, and salinization is not required. The energy-consuming phase changes involved in sea-ice formation and evaporation would not be required for vertical circulation in the ocean. The hypothesized major declines in salinity correspond closely to the evolution of both planktonic foraminifera and calcareous nannoplankton. Both groups were restricted to shelf regions in the Jurassic and early Cretaceous, but spread into the open ocean in the mid-Cretaceous. Their availability to inhabit the open ocean may be directly related to the decline in salinity. The Permian extraction may have created stress for marine organisms and may have been a factor contributing to the end-Permian extinction. The modeling also suggests that there was a major salinity decline from the Late Precambrian to the Cambrian, and it is tempting to speculate that this may have been a factor in the Cambrian explosion of life.
OceanRep arrow_drop_down OceanRepArticle . 2006 . Peer-reviewedFull-Text: http://oceanrep.geomar.de/3486/1/Evap.pdfData sources: OceanRepPalaeogeography Palaeoclimatology PalaeoecologyArticle . 2006 . Peer-reviewedLicense: Elsevier TDMData 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=10.1016/j.palaeo.2006.03.044&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eu185 citations 185 popularity Top 1% influence Top 10% impulse Top 10% Powered by BIP!more_vert OceanRep arrow_drop_down OceanRepArticle . 2006 . Peer-reviewedFull-Text: http://oceanrep.geomar.de/3486/1/Evap.pdfData sources: OceanRepPalaeogeography Palaeoclimatology PalaeoecologyArticle . 2006 . Peer-reviewedLicense: Elsevier TDMData 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.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2020 Germany, Spain, PortugalPublisher:Elsevier BV Mendes, Isabel; Lobo, Francisco J.; Hanebuth, Till J.J.; Lopez-Quiros, Adrian; Schönfeld, Joachim; Lebreiro, Susana; Reguera, Maria I.; Anton, Laura; Ferreira, Oscar;handle: 10261/227582 , 10400.1/16360
Sedimentological, geochemical and benthic foraminiferal proxies were used to interpret changes of depositional environments in a mud entrapment inside the Guadiana River paleo-valley, northern Gulf of Cadiz, to understand the temporal variability of fluvial flooding events and to detect patterns of latitudinal climatic variability in western Iberia. The period between ca. 5800 and ca. 1250 cal yr BP was characterized by slowly accumulating coarse-grained sediments, high content of biogenic sand components, and high abundances of shallow-water benthic foraminiferal species. After ca. 1250 cal yr BP, the sedimentary environment was dominated by fine-grained sediments, with high abundances of opportunistic benthic foraminiferal species and successful colonizers, and high values of geochemical ratios indicative of enhanced terrigenous supply. Sedimentation rates increased drastically over the last ca. 500 years. The genesis of these environments was mainly driven by the variable frequency of fluvial flooding events driven by the regional climate variability. Low terrigenous sediment input under dry conditions prevailed in the older sedimentary unit. Flood frequency and terrigenous sediment supply increased during the younger unit. The variability of the North Atlantic Oscillation at centennial scales highly influenced the sediment supply during the last ca. 500 years, with high terrigenous supply during negative NAO conditions. Our results corroborate an N-S gradient along the Atlantic Iberia during middle and late Holocene, with more humid conditions in the northwestern and drier conditions towards the southeast. The gradient weakened over the past ca. 500 years, with increased rainfalls and flood events during the Little Ice Age. This study was made possible by the CADISED (Cadiz Shelf Sediment Depocentres) survey (MARUM research cruise POS482, Germany), and was also supported by projects UID/0350/2020 CIMA of the Portuguese Science Foundation (FCT) and CGL2011-30302-C02-02 and CTM2017-88237-P of the Spanish Ministry of Economy and Competitiveness. Isabel Mendes also thanks to FCT for Research Assistant contract DL57/2016/CP1361/CT0009.
Sapientia Repositóri... arrow_drop_down Recolector de Ciencia Abierta, RECOLECTA; DIGITAL.CSICArticle . 2021 . 2020OceanRep; Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2020 . Peer-reviewedLicense: Elsevier TDMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess RoutesGreen 7 citations 7 popularity Top 10% influence Average impulse Average Powered by BIP!visibility 76visibility views 76 download downloads 49 Powered bymore_vert Sapientia Repositóri... arrow_drop_down Recolector de Ciencia Abierta, RECOLECTA; DIGITAL.CSICArticle . 2021 . 2020OceanRep; Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2020 . Peer-reviewedLicense: Elsevier TDMadd 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.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 1989 GermanyPublisher:Elsevier BV Funded by:NSF | Fluid Venting Processes i..., NSF | Processes of Sediment Lit...NSF| Fluid Venting Processes in the Oregon Accretionary Complex ,NSF| Processes of Sediment Lithification Induced by Subduction Accretion off Central Oregon and Southern WashingtonAuthors: Han, M. W.; Suess, Erwin;Han, M. W.; Suess, Erwin;Abstract Pore fluid venting associated with subduction-induced sediment deformation causes precipitation of calcium carbonate as prominent carbonate chimneys or cement in the accreted sediments across the active continental margin off Oregon and Washington. A depletion of interstitial Ca 2+ with a maximum decrease of 50% relative to seawater Ca 2+ over only 1.5m depth and reduction in porosity in the deformed sediments suggest that interstitial Ca 2+ is removed to form calcium carbonate cement. In contrast, the pore waters of the undeformed abyssal plain sediments show no depletion in dissolved Ca 2+ . They are either enriched to a maximum of 5% or show no change in dissolved Ca 2+ . Here the background level of CaCO 3 content in the sediment is only 0.1 to 1%. Calcium carbonate precipitation in the deformed sediments probably occurs as the result of upward migration and oxidation of biogenic methane and of the increase in carbonate saturation due to release of excess pore pressure during fluid venting. Upward advection of fluids at rates of 1–28 cm y −1 is predicted from diffusion-advection-reaction models applied to the downcore concentration profiles of dissolved Ca 2+ and NH 4 + in the tectonically-deformed sediments. The range of predicted flow rates is related to the type of calcium carbonate lithification; i.e. slow rates generate cement and fast rates generate chimneys. Carbonate mineral precipitation associated with pore fluid venting requires direct transfer of Ca 2+ from the oceanic basement to the accretionary complex. Such a mechanism leads us to propose that the accretionary complexes of the global plate subduction zones are a major sink for crustal Ca 2+ . A global flux of crustal Ca 2+ that is removed by carbonate mineral precipitation may be as muc3 as the hydrothermal Ca-input. This significant Ca-flux, not previously considered in the global geochemical budget, implies that pore fluid venting in subduction zones may also act as a global sink or source for other elements.
OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 1989 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess Routesbronze 67 citations 67 popularity Average influence Top 10% impulse Top 10% Powered by BIP!more_vert OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 1989 . Peer-reviewedLicense: Elsevier TDMData 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.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2004 GermanyPublisher:Elsevier BV Authors: Kandiano, Evgeniya S.; Bauch, Henning A.; Müller, A.;Kandiano, Evgeniya S.; Bauch, Henning A.; Müller, A.;Climate variability in the northeast Atlantic was investigated on glacial–interglacial and millennial time scales during the last 200 000 years, using sea surface temperature (SST) records derived from planktonic foraminiferal diversities and from Mg/Ca measurements on Globigerina bulloides. Paleoceanographical interpretations are supported by species composition analyses, benthic and planktonic isotopic data as well as records of iceberg-rafted debris (IRD). Differences of climate development are recognized for both interglacial and glacial periods. Temperature estimates indicate slightly warmer conditions (up to 2°C) during marine oxygen isotope stage (MIS) 5e than during the Holocene. In contrast to the last glaciation, when the SST minimum coincided with a minimum in solar insolation immediately before Termination I, during the penultimate glaciation a long SST minimum occurred at times of intermediate solar insolation well preceding the onset of Termination II. This discrepancy between two glacial terminations may be explained by an inherently different orbital configuration characteristic for each glacial interval. Despite these differences between the two glacial trends, the superimposed shorter-lived climatic events reveal the same order of principal steps, implying their common causal nature. A direct comparison of faunal SSTs with those retrieved from Mg/Ca analysis shows that Mg/Ca-derived temperatures follow the general glacial–interglacial trend; however, the latter appear to be largely overestimated. Supported by δ18O data in G. bulloides, which show little response to millennial-scale variability, there seems to be a need for species-dependent calibration experiments that also consider the different oceanographic settings this particular species can live in.
OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2004 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eu57 citations 57 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2004 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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description Publicationkeyboard_double_arrow_right Article 2011Publisher:Elsevier BV Kirstin Werner; Robert F Spielhagen; Dorothea Bauch; H. Christian Hass; Evgeniya Kandiano; Katarzyna Zamelczyk;A multiproxy data set of an AMS radiocarbon dated 46 cm long sediment core from the continental margin off western Svalbard reveals multidecadal climatic variability during the past two millennia. Investigation of planktic and benthic stable isotopes, planktic foraminiferal fauna, and lithogenic parameters aims to unveil the Atlantic Water advection to the eastern Fram Strait by intensity, temperatures, and salinities. Atlantic Water has been continuously present at the site over the last 2,000 years. Superimposed on the increase in sea ice/icebergs, a strengthened intensity of Atlantic Water inflow and seasonal ice-free conditions were detected at ~ 1000 to 1200 AD, during the well-known Medieval Climate Anomaly (MCA). However, temperatures of the MCA never exceeded those of the 20th century. Since ~ 1400 AD significantly higher portions of ice rafted debris and high planktic foraminifer fluxes suggest that the site was located in the region of a seasonal highly fluctuating sea ice margin. A sharp reduction in planktic foraminifer fluxes around 800 AD and after 1730 AD indicates cool summer conditions with major influence of sea ice/icebergs. High amounts of the subpolar planktic foraminifer species Turborotalia quinqueloba in size fraction 150–250 μm indicate strengthened Atlantic Water inflow to the eastern Fram Strait already after ~ 1860 AD. Nevertheless surface conditions stayed cold well into the 20th century indicated by low planktic foraminiferal fluxes. Most likely at the beginning of the 20th century, cold conditions of the terminating Little Ice Age period persisted at the surface whereas warm and saline Atlantic Water already strengthened, hereby subsiding below the cold upper mixed layer. Surface sediments with high abundances of subpolar planktic foraminifers indicate a strong inflow of Atlantic Water providing seasonal ice-free conditions in the eastern Fram Strait during the last few decades.
Palaeogeography Pala... arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2011 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess Routesbronze 53 citations 53 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert Palaeogeography Pala... arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2011 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2004 GermanyPublisher:Elsevier BV Authors: Bobrov, Anatoly A.; Andreev, Andrei A.; Schirrmeister, Lutz; Siegert, Christine;Bobrov, Anatoly A.; Andreev, Andrei A.; Schirrmeister, Lutz; Siegert, Christine;Testate amoebae (Protozoa: Testacea) were studied in the Late Quaternary permafrost deposits in the Siberian Arctic (Bykovsky Peninsula of the Laptev Sea coast, 71°40′ –71°80′ N and 129°–129°30′ E). The Testacea associations studied reflect specific environmental conditions in paleocryosols, which were controlled by the local micro-relief as well as by regional climate conditions. In total, 86 species, varieties, and forms of testate amoebae were found in 38 Pleistocene and Holocene samples. The rhizopods indicate that soil conditions at ca. 53,000 14C years BP were probably rather similar to the modern cold and wet arctic tundra environment. More moisture and warmer soil conditions were relatively favorable for rhizopods ca. 45,300–43,000 14C years BP, but it was significantly drier at about 42,000 14C years BP. Drier and colder environmental conditions were also present about 39,300–35,000 14C years BP. The Late Pleistocene samples, radiocarbon dated to 33,000–12,000 years BP, are characterized by a low species diversity and density indicating that this period may have been extremely cold and dry. This conjecture is also supported by the polymorphism of some species. Hydrophilic Difflugia species (mostly obligate hydrobiotes) are broadly represented in the studied Holocene samples. The species composition and density of rhizopods in the majority of Holocene samples suggest wet and relatively warm conditions. Changes in rhizopod assemblages during the last 53,000 years were not very dramatic, mostly consisting of rare species and changes in the dominant species complexes during the Pleistocene and Holocene. However, these changes were more drastic during the Pleistocene. They were probably at least partly responsible for the disappearance of some rare testacean species such as Argynnia sp.
OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2004 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess Routesbronze 44 citations 44 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2004 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 1989 GermanyPublisher:Elsevier BV Authors: Suess, Erwin; Whiticar, M. J.;Suess, Erwin; Whiticar, M. J.;Pore fluids extracted from near-surface sediments of the deformation front along the Oregon subduction zone have, in general, the dissolved nutrient pattern characteristic of bacterial sulfate reduction. However, in certain locations there are peculiar ammonium distributions and anomalously 13C-depleted dissolved ΣCO2. These carbon isotope and nutrient patterns are attributed to the concurrent microbially-mediated oxidation of sedimentary organic matter (POC) and methane (CH4) originating from depth. In contrast to the oxidation of sedimentary organic matter in the sulfate zone, utilization of methane as the carbon source by sulfate-reducing bacteria would generate only half as much total carbon dioxide for each mole of sulfate consumed and would not generate any dissolved ammonium. The isotopically light ΣCO2 released from methane oxidation depletes the total metabolic carbon dioxide pool. Therefore, NH4+, ΣCO2 and δ13C of interstitial carbon dioxide in these pore fluids distintcly reflect the combined contributions of each of the two carbon substrates undergoing mineralization; i.e. methane and sedimentary organic matter. By appropriately partitioning the nutrient and substrate relationships, we calculate that in the area of the marginal ridge of the Oregon subduction zone as much as 30% of the ΣCO2 in pore fluids may result from methane oxidation. The calculation also predicts that the carbon isotope signature of the carbon dioxide derived from methane is between −35‰ and −63‰ PDB. Such an isotopically light gas generated from within the accretionary complex could be the residue of a biogenic methane pool. Fluid advection is required to carry such methane from depth to the present near-surface sediments. This mechanism is consistent with large-scale, tectonically-induced fluid transport envisioned for accreted sediments of the world's convergent plate boundaries.
OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 1989 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess Routesbronze 130 citations 130 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 1989 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2020 GermanyPublisher:Elsevier BV Rudenko, Оlga; Taldenkova, Еkaterina; Ovsepyan, Yaroslav; Stepanova, Аnna; Bauch, Henning A.;Highlights • Land-shelf interactions in vicinity to the Lena River delta since 6 cal. ka. • Arctic tundra and taiga zones drained by the Lena River form shelf pollen assemblages. • Warmer-than-present climatic conditions 6–4.5 cal. ka and subsequent gradual cooling. • Estuarine-like reversed (N to S) bottom current activity along submarine paleovalleys. • Principal diversion of the major Lena River outflows to the east since 0.5 cal. ka. Abstract Land-shelf interactions and related environmental changes were reconstructed for the past 6 cal. kyrs interpreting multiproxy records from the two AMS14C-dated sediment cores from the sites located to the north and northeast of the Lena River delta. Proxies used include terrestrial and aquatic palynomorphs, benthic/planktic foraminifers and ostracods paired with benthic δ18O and δ13C records of Haynesina orbiculare. The study focused on unravelling the relation between river runoff and the regional climate changes on the one hand, and its imprint on the shelf sea environment on timescales beyond the instrumental records on the other. The palynomorph records show that the Lena River outflow largely determined the composition of species associations and the magnitude of terrestrial matter influx from land. Pollen assemblages of the inner Laptev Sea shelf reflect complex pollen contribution of the Arctic tundra and remote taiga zones drained by the Lena River and indicate a vegetation response to warmer-than-present climatic conditions between 6.0 and 4.5 cal. ka and a subsequent gradual cooling. Fluvial influence in the records is manifested by (1) increases in sedimentation rates; (2) high influxes of pollen/spores and freshwater chlorophycean algae, wood and plant remains; (3) negative δ13C excursions due to the introduction of dissolved inorganic carbon (DIC) from river water. Episodes of enhanced freshwater influence in the surface water layers (fluvial events) correlate with positive benthic δ18O excursions and increasing representation of river-distal species among benthics. Altogether, this points to an estuarine-like reversed (north to south) bottom current activity along the submarine paleovalleys on the shelf. The most pronounced fluvial events are recognized at 5.3–5.9, 1.5 and <0.5 cal. ka. The oldest fluvial event coincides with the final stage of mid-Holocene climate warming. A fluvial event at 1.5 cal. ka is specifically strong at the northeastern site thus marking a direction change of the Lena River outflow at this time and the progressive protrusion of the delta. During the past 500 years distinct negative δ13C values at the northeastern site reflect enhanced riverine influence. It is therefore concluded that the unprecedented change in the δ13C trend corroborates the other evidence for a principal diversion of the major Lena River outflows into its present-day, easterly direction.
Palaeogeography Pala... arrow_drop_down OceanRep; Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2020 . Peer-reviewedLicense: Elsevier TDMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess Routesbronze 6 citations 6 popularity Top 10% influence Average impulse Average Powered by BIP!more_vert Palaeogeography Pala... arrow_drop_down OceanRep; Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2020 . Peer-reviewedLicense: Elsevier TDMadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article , Other literature type 2020 Germany, Croatia, Croatia, ItalyPublisher:Elsevier BV Funded by:EC | GeoTwinnEC| GeoTwinnBrunović, Dea; Miko, Slobodan; Hasan, Ozren; Papatheodorou, George; Ilijanić, Nikolina; Miserocchi, Stefano; Correggiari, Annamaria; Geraga, Maria;Abstract The results of a comprehensive study of submerged paleoenvironments developed along the karstified eastern Adriatic coast during the Late Quaternary are presented in this study. The Losinj Channel is a drowned karst basin filled with sediments. A multi-proxy analysis of two sediment cores (LK-12 and LK-15) recovered from water depths of 62 and 64 m was conducted. We used magnetic susceptibility, grain size, mineralogy, XRF core scanning, organic and inorganic carbon, total nitrogen, and paleontological data, supplemented with AMS 14C dating results and high-resolution seismic data, to reconstruct the infill history of the Losinj basin during the Late Pleistocene and Holocene. Our findings include the first detailed description of the presumed Marine Isotope Stage (MIS) 5a marine sediment succession along the eastern Adriatic coast. Deposition in the brackish-to-freshwater lacustrine body (Losinj paleolake) occurred during MIS 3. Sea level lowstand that followed caused the formation of environmental conditions typical of a karst polje. The post-Last Glacial Maximum (LGM) sea level rise led to the establishment of a brackish marine lake with seawater seepage through the karstified sill at 13.7 cal kyr B.P. The transition to the present-day marine conditions commenced at 10.5 cal kyr B.P. Paleoenvironmental changes in the investigated area can be linked to the presence of a sill at −50 m depth that separates the Losinj basin from the Kvarneric Bay. The sill depth determines the isolation or inundation of the investigated basin in response to the changes in sea level. Paleoenvironments reacted sensitively to these changes, and therefore, the study area represents an ideal setting to track regional sea level and climate variabilty.
Repository of the Cr... arrow_drop_down Repository of the Croatian Geological SurveyArticle . 2020Data sources: Repository of the Croatian Geological SurveyOceanRep; Palaeogeography Palaeoclimatology PalaeoecologyOther literature type . Article . 2020 . Peer-reviewedLicense: Elsevier TDMCroatian Scientific Bibliography - CROSBIOther literature type . 2020Data sources: Croatian Scientific Bibliography - CROSBIadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eu30 citations 30 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert Repository of the Cr... arrow_drop_down Repository of the Croatian Geological SurveyArticle . 2020Data sources: Repository of the Croatian Geological SurveyOceanRep; Palaeogeography Palaeoclimatology PalaeoecologyOther literature type . Article . 2020 . Peer-reviewedLicense: Elsevier TDMCroatian Scientific Bibliography - CROSBIOther literature type . 2020Data sources: Croatian Scientific Bibliography - CROSBIadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2021 GermanyPublisher:Elsevier BV Zhengchuang Hui; Xuewen Zhou; Manuel Chevalier; Xiao Wei; Yanfang Pan; Yingyong Chen;Highlights: • A quantitative record of Miocene EASM from northern China was obtained. • The EASM stepwise decreased from ~17.1 Ma to 7.4 Ma and increased after ~7.4 Ma. • Middle Miocene EASM evolution is mainly regulating by temperature changes. • Palaeogeography play a key role in controlling the evolution of late Miocene EASM. Abstract The East Asian summer monsoon (EASM) precipitation is vital to hydrology, ecology and societal activities in the densely populated region of East Asia. However, its long-term evolution history and driving forces during the relatively warm Miocene remain unclear, even conflicting in some intervals. Here, we present a new, and quantitative record of EASM precipitation during Miocene using the Bayesian approach of Climate Reconstruction Software (CREST) based on pollen flora from the Tianshui Basin located on the northwestern Tibetan Plateau (TP). The results demonstrate that a strong and relatively stable EASM precipitation period occurred during the Neogene in northern China at ~17.1–13.6 Ma, which was followed by a strong and gradual decreasing period between ~13.6 and 7.4 Ma. This trend was abruptly stopped at ~7.4 Ma with the beginning of a period of large amplitude precipitation increase. The comparison analysis reveals that the gradual decrease of EASM precipitation during the period of ~17.1–7.4 Ma was primarily controlled by the global cooling, whereas the significant increase period after ~7.4 Ma was mainly related to the late Miocene uplift of the TP, supporting climate model simulations, in which both the global temperature and palaeogeography play important roles in regulating the long-term evolution of EASM precipitation.
OceanRep; Palaeogeog... arrow_drop_down OceanRep; Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2021 . Peer-reviewedLicense: CC BY NC NDServeur académique lausannoisArticle . 2021License: CC BY NC NDData sources: Serveur académique lausannoisadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.euAccess Routeshybrid 13 citations 13 popularity Top 10% influence Average impulse Top 10% Powered by BIP!more_vert OceanRep; Palaeogeog... arrow_drop_down OceanRep; Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2021 . Peer-reviewedLicense: CC BY NC NDServeur académique lausannoisArticle . 2021License: CC BY NC NDData sources: Serveur académique lausannoisadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2006 GermanyPublisher:Elsevier BV Hay, William W.; Migdisov, A.; Balukhovsky, A.N.; Wold, C.N.; Flögel, Sascha; Söding, Emanuel;A compilation of data on volumes and masses of evaporite deposits is used as the basis for reconstruction of the salinity of the ocean in the past. Chloride is tracked as the only ion essentially restricted to the ocean, and past salinities are calculated from reconstructed chlorine content of the ocean. Models for ocean salinity through the Phanerozoic are developed using maximal and minimal estimates of the volumes of existing evaporite deposits, and using constant and declining volumes of ocean water through the Phanerozoic. We conclude that there have been significant changes in the mean salinity of the ocean accompanying a general decline throughout the Phanerozoic. The greatest changes are related to major extractions of salt into the young ocean basins which developed during the Mesozoic as Pangaea broke apart. Unfortunately, the sizes of these salt deposits are also the least well known. The last major extractions of salt from the ocean occurred during the Miocene, shortly after the large scale extraction of water from the ocean to form the ice cap of Antarctica. However, these two modifications of the masses of H2O and salt in the ocean followed in sequence and did not cancel each other out. Accordingly, salinities during the Early Miocene were between 37‰ and 39‰. The Mesozoic was a time of generally declining salinity associated with the deep sea salt extractions of the North Atlantic and Gulf of Mexico (Middle to Late Jurassic) and South Atlantic (Early Cretaceous). The earliest of the major extractions of the Phanerozoic occurred during the Permian. There were few large extractions of salt during the earlier Palaeozoic. The models suggest that this was a time of relatively stable but slowly increasing salinities ranging through the upper 40‰'s into the lower 50‰'s. Higher salinities for the world ocean have profound consequences for the thermohaline circulation of the ocean in the past. In the modern ocean, with an average salinity of about 34.7‰, the density of water is only very slightly affected by cooling as it approaches the freezing point. Consequently, salinization through sea-ice formation or evaporation is usually required to make water dense enough to sink into the ocean interior. At salinities above about 40‰ water continues to become more dense as it approaches the freezing point, and salinization is not required. The energy-consuming phase changes involved in sea-ice formation and evaporation would not be required for vertical circulation in the ocean. The hypothesized major declines in salinity correspond closely to the evolution of both planktonic foraminifera and calcareous nannoplankton. Both groups were restricted to shelf regions in the Jurassic and early Cretaceous, but spread into the open ocean in the mid-Cretaceous. Their availability to inhabit the open ocean may be directly related to the decline in salinity. The Permian extraction may have created stress for marine organisms and may have been a factor contributing to the end-Permian extinction. The modeling also suggests that there was a major salinity decline from the Late Precambrian to the Cambrian, and it is tempting to speculate that this may have been a factor in the Cambrian explosion of life.
OceanRep arrow_drop_down OceanRepArticle . 2006 . Peer-reviewedFull-Text: http://oceanrep.geomar.de/3486/1/Evap.pdfData sources: OceanRepPalaeogeography Palaeoclimatology PalaeoecologyArticle . 2006 . Peer-reviewedLicense: Elsevier TDMData 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.
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For further information contact us at helpdesk@openaire.eu185 citations 185 popularity Top 1% influence Top 10% impulse Top 10% Powered by BIP!more_vert OceanRep arrow_drop_down OceanRepArticle . 2006 . Peer-reviewedFull-Text: http://oceanrep.geomar.de/3486/1/Evap.pdfData sources: OceanRepPalaeogeography Palaeoclimatology PalaeoecologyArticle . 2006 . Peer-reviewedLicense: Elsevier TDMData 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.
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For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2020 Germany, Spain, PortugalPublisher:Elsevier BV Mendes, Isabel; Lobo, Francisco J.; Hanebuth, Till J.J.; Lopez-Quiros, Adrian; Schönfeld, Joachim; Lebreiro, Susana; Reguera, Maria I.; Anton, Laura; Ferreira, Oscar;handle: 10261/227582 , 10400.1/16360
Sedimentological, geochemical and benthic foraminiferal proxies were used to interpret changes of depositional environments in a mud entrapment inside the Guadiana River paleo-valley, northern Gulf of Cadiz, to understand the temporal variability of fluvial flooding events and to detect patterns of latitudinal climatic variability in western Iberia. The period between ca. 5800 and ca. 1250 cal yr BP was characterized by slowly accumulating coarse-grained sediments, high content of biogenic sand components, and high abundances of shallow-water benthic foraminiferal species. After ca. 1250 cal yr BP, the sedimentary environment was dominated by fine-grained sediments, with high abundances of opportunistic benthic foraminiferal species and successful colonizers, and high values of geochemical ratios indicative of enhanced terrigenous supply. Sedimentation rates increased drastically over the last ca. 500 years. The genesis of these environments was mainly driven by the variable frequency of fluvial flooding events driven by the regional climate variability. Low terrigenous sediment input under dry conditions prevailed in the older sedimentary unit. Flood frequency and terrigenous sediment supply increased during the younger unit. The variability of the North Atlantic Oscillation at centennial scales highly influenced the sediment supply during the last ca. 500 years, with high terrigenous supply during negative NAO conditions. Our results corroborate an N-S gradient along the Atlantic Iberia during middle and late Holocene, with more humid conditions in the northwestern and drier conditions towards the southeast. The gradient weakened over the past ca. 500 years, with increased rainfalls and flood events during the Little Ice Age. This study was made possible by the CADISED (Cadiz Shelf Sediment Depocentres) survey (MARUM research cruise POS482, Germany), and was also supported by projects UID/0350/2020 CIMA of the Portuguese Science Foundation (FCT) and CGL2011-30302-C02-02 and CTM2017-88237-P of the Spanish Ministry of Economy and Competitiveness. Isabel Mendes also thanks to FCT for Research Assistant contract DL57/2016/CP1361/CT0009.
Sapientia Repositóri... arrow_drop_down Recolector de Ciencia Abierta, RECOLECTA; DIGITAL.CSICArticle . 2021 . 2020OceanRep; Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2020 . Peer-reviewedLicense: Elsevier TDMadd 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.
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For further information contact us at helpdesk@openaire.euAccess RoutesGreen 7 citations 7 popularity Top 10% influence Average impulse Average Powered by BIP!visibility 76visibility views 76 download downloads 49 Powered bymore_vert Sapientia Repositóri... arrow_drop_down Recolector de Ciencia Abierta, RECOLECTA; DIGITAL.CSICArticle . 2021 . 2020OceanRep; Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2020 . Peer-reviewedLicense: Elsevier TDMadd 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.palaeo.2020.109900&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 1989 GermanyPublisher:Elsevier BV Funded by:NSF | Fluid Venting Processes i..., NSF | Processes of Sediment Lit...NSF| Fluid Venting Processes in the Oregon Accretionary Complex ,NSF| Processes of Sediment Lithification Induced by Subduction Accretion off Central Oregon and Southern WashingtonAuthors: Han, M. W.; Suess, Erwin;Han, M. W.; Suess, Erwin;Abstract Pore fluid venting associated with subduction-induced sediment deformation causes precipitation of calcium carbonate as prominent carbonate chimneys or cement in the accreted sediments across the active continental margin off Oregon and Washington. A depletion of interstitial Ca 2+ with a maximum decrease of 50% relative to seawater Ca 2+ over only 1.5m depth and reduction in porosity in the deformed sediments suggest that interstitial Ca 2+ is removed to form calcium carbonate cement. In contrast, the pore waters of the undeformed abyssal plain sediments show no depletion in dissolved Ca 2+ . They are either enriched to a maximum of 5% or show no change in dissolved Ca 2+ . Here the background level of CaCO 3 content in the sediment is only 0.1 to 1%. Calcium carbonate precipitation in the deformed sediments probably occurs as the result of upward migration and oxidation of biogenic methane and of the increase in carbonate saturation due to release of excess pore pressure during fluid venting. Upward advection of fluids at rates of 1–28 cm y −1 is predicted from diffusion-advection-reaction models applied to the downcore concentration profiles of dissolved Ca 2+ and NH 4 + in the tectonically-deformed sediments. The range of predicted flow rates is related to the type of calcium carbonate lithification; i.e. slow rates generate cement and fast rates generate chimneys. Carbonate mineral precipitation associated with pore fluid venting requires direct transfer of Ca 2+ from the oceanic basement to the accretionary complex. Such a mechanism leads us to propose that the accretionary complexes of the global plate subduction zones are a major sink for crustal Ca 2+ . A global flux of crustal Ca 2+ that is removed by carbonate mineral precipitation may be as muc3 as the hydrothermal Ca-input. This significant Ca-flux, not previously considered in the global geochemical budget, implies that pore fluid venting in subduction zones may also act as a global sink or source for other elements.
OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 1989 . Peer-reviewedLicense: Elsevier TDMData 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.
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For further information contact us at helpdesk@openaire.euAccess Routesbronze 67 citations 67 popularity Average influence Top 10% impulse Top 10% Powered by BIP!more_vert OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 1989 . Peer-reviewedLicense: Elsevier TDMData 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=10.1016/0031-0182(89)90032-1&type=result"></script>'); --> </script>
For further information contact us at helpdesk@openaire.eudescription Publicationkeyboard_double_arrow_right Article 2004 GermanyPublisher:Elsevier BV Authors: Kandiano, Evgeniya S.; Bauch, Henning A.; Müller, A.;Kandiano, Evgeniya S.; Bauch, Henning A.; Müller, A.;Climate variability in the northeast Atlantic was investigated on glacial–interglacial and millennial time scales during the last 200 000 years, using sea surface temperature (SST) records derived from planktonic foraminiferal diversities and from Mg/Ca measurements on Globigerina bulloides. Paleoceanographical interpretations are supported by species composition analyses, benthic and planktonic isotopic data as well as records of iceberg-rafted debris (IRD). Differences of climate development are recognized for both interglacial and glacial periods. Temperature estimates indicate slightly warmer conditions (up to 2°C) during marine oxygen isotope stage (MIS) 5e than during the Holocene. In contrast to the last glaciation, when the SST minimum coincided with a minimum in solar insolation immediately before Termination I, during the penultimate glaciation a long SST minimum occurred at times of intermediate solar insolation well preceding the onset of Termination II. This discrepancy between two glacial terminations may be explained by an inherently different orbital configuration characteristic for each glacial interval. Despite these differences between the two glacial trends, the superimposed shorter-lived climatic events reveal the same order of principal steps, implying their common causal nature. A direct comparison of faunal SSTs with those retrieved from Mg/Ca analysis shows that Mg/Ca-derived temperatures follow the general glacial–interglacial trend; however, the latter appear to be largely overestimated. Supported by δ18O data in G. bulloides, which show little response to millennial-scale variability, there seems to be a need for species-dependent calibration experiments that also consider the different oceanographic settings this particular species can live in.
OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2004 . Peer-reviewedLicense: Elsevier TDMData sources: Crossrefadd ClaimPlease grant OpenAIRE to access and update your ORCID works.This Research product is the result of merged Research products in OpenAIRE.
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For further information contact us at helpdesk@openaire.eu57 citations 57 popularity Top 10% influence Top 10% impulse Top 10% Powered by BIP!more_vert OceanRep arrow_drop_down Palaeogeography Palaeoclimatology PalaeoecologyArticle . 2004 . Peer-reviewedLicense: Elsevier TDMData 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.
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