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69 Research products, page 1 of 7

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  • Open Access English
    Authors: 
    Mogollón, J. M.; Dale, A. W.; Fossing, H.; Regnier, P.;
    Project: EC | BONUS+ (217246)

    Arkona Basin (southwestern Baltic Sea) is a seasonally-hypoxic basin characterized by the presence of free methane gas in its youngest organic-rich muddy stratum. Through the use of reactive transport models, this study tracks the development of the methane geochemistry in Arkona Basin as this muddy sediment became deposited during the last 8 kyr. Four cores are modeled each pertaining to a unique geochemical scenario according to their respective contemporary geochemical profiles. Ultimately the thickness of the muddy sediment and the flux of particulate organic carbon are crucial in determining the advent of both methanogenesis and free methane gas, the timescales over which methanogenesis takes over as a dominant reaction pathway for organic matter degradation, and the timescales required for free methane gas to form.

  • Open Access English
    Authors: 
    Karlsson, Mikael; Gilek, Michael; Lundberg, Cecilia;
    Publisher: Springer International Publishing
  • Open Access English
    Authors: 
    Asanti, Tuomas;
    Publisher: Yrkeshögskolan Arcada
    Country: Finland

    The aim of this thesis was to study how small logistics sector and fish sector companies in Kymenlaakso region have experienced the effects of Russia’s counter-sanctions. The main research questions in the study were “Have the Russia’s counter-sanctions affected companies’ businesses in Kymenlaakso region?”, “What kind of effect(s) have the companies identified and encountered?”, “What measures have companies taken regarding the situation?” and “Have the companies tried to find new markets for their products or services?”. The primary research method in this study was a semi-structured interview. The author of this thesis interviewed professionals and experts from different companies from the chosen sectors during spring 2015. The findings show that small companies in the logistics sector and fish sector have experienced either direct or indirect effects that have been caused by the counter-sanctions. Main challenges for the fish sector are decreases in producer prices and tightened competition in the European Union area. The logistics sector has experienced difficulties due to tightened liquidity conditions. There have also been bankruptcies in the logistics sector directly caused by the counter-sanctions. Companies in both sectors have been forced to look for alternative markets, postpone investments and lay-off or terminate personnel. Scepticism and uncertainty regarding trade with Russian customers and companies have emerged. On a national level, Finland’s container balance has been negatively affected partly due to the counter-sanctions. The scope of this study is limited to small fish sector and logistics sector companies in Kymenlaakso region. Also, due to the qualitative nature of the primary research method the findings of this study are not generalizable to the public. Tämän opinnäytetyön tarkoituksena oli tarkastella sitä miten pienet logistiikka –ja kalasektorin yritykset Kymenlaakson alueella ovat kokeneet Venäjän asettamien vastapakotteiden vaikutukset. Opinnäytetyön tutkimuskysymykset olivat ”Ovatko Venäjän vastapakotteet vaikuttaneet yritysten toimintaan Kymenlaakson alueella?”, ”Millaisia vaikutuksia yritykset ovat kohdanneet ja identifioineet?”, ”Mitä toimenpiteitä yritykset ovat tehneet tilanteeseen liittyen?” ja ”Ovatko yritykset pyrkineet löytämään tuotteilleen tai palveluilleen uusia markkinoita?”. Tämän opinnäytetyön ensisijainen tutkimusmenetelmä oli semistrukturoitu haastattelu. Opinnäytetyön tekijä haastatteli asiantuntijoita sekä ammattilaisia valituilta sektoreilta kevään 2015 aikana. Tulokset näyttävät, että pienet logistiikka –ja kalasektorin yritykset ovat kohdanneet joko suoria tai epäsuoria vastapakotteiden aiheuttamia vaikutuksia. Keskeisimmät haasteet kalasektorilla johtuvat tuottajahintojen laskusta sekä kiristyneestä kilpailuista Euroopan Union alueella. Logistiikkasektorilla on kohdannut vaikeuksia, jotka ovat johtuneet yritysten hankaloituneesta likviditeettitilanteesta. Myös vastapakotteiden suoraan aiheuttamia konkursseja on havaittu. Molempien sektorien yritykset ovat joutuneet etsimään tuotteilleen tai palveluilleen uusia markkinoita, viivästyttämään investointeja sekä lomauttamaan tai irtisanomaan henkilöstöä. Skeptisyys sekä epävarmuus kaupankäynnissä venäläisten asiakkaiden sekä yritysten kanssa on noussut esiin. Kansallisella tasolla vastapakotteilla on osaltaan ollut negatiivinen vaikutus Suomen konttitasapainoon. Tämän opinnäytetyö on rajoitettu tarkastelemaan pieniä logistiikka – ja kalasektorin yrityksiä Kymenlaakson alueella. Lisäksi, johtuen kvalitatiivisesta tutkimusmenetelmästä tämän opinnäytetyön tuloksia ei voida pitää yleistettävinä muihin yrityksiin.

  • Open Access English
    Authors: 
    Ssebugere, Patrick;
    Publisher: Lappeenranta University of Technology
    Country: Finland

    This thesis describes the occurrence and sources of selected persistent organic pollutants (POPs) such as polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs) and hexachlorocyclohexanes (HCHs) in the northern watershed of Lake Victoria. Sediments and fish were collected from three highly polluted embayments (i.e. Murchison Bay, Napoleon Gulf and Thurston Bay) of the lake. The analysis for PCDD/Fs, PCBs and PBDEs was done using a high resolution mass spectrometer coupled to a gas chromatograph (GC), and a GC equipped with an electron capture detector was used for HCHs. Total (Σ) PCDD/Fs, PCBs and PBDEs in sediments ranged from 3.19 to 478, 313 to 4325 and 60.8 to 179 pg g-1 dry weight (dw), respectively. The highest concentrations of pollutants were found at sites close to industrial areas and wastewater discharge points. The maximum concentrations of PCDD/Fs, PCBs, PBDEs and HCHs in fish muscle homogenates were 49, 779, 495 and 45,900 pg g-1 wet weight (ww), respectively. The concentrations of the pollutants in Nile perch (Lates niloticus) were significantly greater than those in Nile tilapia (Oreochromis niloticus), possibly due to differences in trophic level and dietary feeding habits among fish species. World Health Organization-toxic equivalency quotient (WHO2005-TEQ) values in the sediments were up to 4.24 pg g-1 dw for PCDD/Fs and 0.55 pg TEQ g-1 dw for the 12 dioxin-like PCBs (dl-PCBs). 23.1% of the samples from the Napoleon Gulf were above the interim sediment quality guideline value of 0.85 pg WHO-TEQ g-1 dw set by the Canadian Council for Ministers of the Environment. The WHO2005-TEQs in fish were 0.001-0.16 pg g-1 for PCDD/Fs and 0.001-0.31 pg g-1 ww for dl- PCBs. The TEQ values were within a permissible level of 3.5 pg g−1 ww recommended by the European Commission. Based on the Commission set TEQs and minimum risk level criteria formulated by the Agency for Toxic Substances and Disease Registry, the consumption of fish from Lake Victoria gives no indication of health risks associated to PCDD/Fs and PCBs. Principal component analysis (PCA) indicated that anthropogenic activities such as agricultural straw open burning, medical waste incinerators and municipal solid waste combustors were the major sources of PCDD/Fs in the watershed of Lake Victoria. The ratios of α-/γ-HCH varied from 0.89 to 1.68 suggesting that the highest HCH residues mainly came from earlier usage and fresh γ-HCH (lindane). In the present study, the concentration of POPs in fish were not significantly related to those in sediments, and the biota sediment accumulation factor (BSAF) concept was found to be a poor predictor of the bioavailability and bioaccumulation of environmental pollutants.

  • Open Access English
    Authors: 
    Dinh, Ngoc Thi;
    Publisher: Yrkeshögskolan Novia
    Country: Finland

    Purpose: Identify impacts of Song Bung 4 Hydropower project to diversity and hydrology; Criticise on mitigation practice and impacts. Method: Screen of impacts from records of other projects and mitigations; Compare with identified impacts and mitigation practices. Findings: Direct lost of some species; environmental flow is not implemented regularly; higher fish yield in reservoir; threaten migratory fish

  • Open Access
    Authors: 
    Lochte, Karin;
    Publisher: PANGAEA
    Country: Germany
  • Open Access English
    Authors: 
    Pham, Thanh Huyen;
    Publisher: Satakunnan ammattikorkeakoulu
    Country: Finland

    Analyzing and improving marketing strategies of Thien Hong Joint Stock company - a newborn company in the field of sea freight forwarding service in Vietnam. This thesis focused on the 4Ps (product, price, placement, promotion) in marketing strategy, how to apply the theory of services marketing in a business to business company and a special industry effectively.

  • English
    Authors: 
    Spilling, Kristian;
    Publisher: PANGAEA - Data Publisher for Earth & Environmental Science
    Project: AKA | Changing phytoplankton co... (259164), EC | ASSEMBLE (227799)

    In an enclosure experiment, we employed two levels of inorganic NP ratios (10 and 5) for three distinct plankton communities collected along the coast of central Chile (33ºS). Each combination of community and NP level was replicated three times. The experiment lasted 12 days, and the data set include inorganic nutrients (NO3, PO4, DSi), particular organic carbon (POC), nitrogen (PON) and phosphorus (POP), Chlorophyll a, a range of fluorescence based measurements such as photochemical efficiency (Fv/Fm) and community data. The primary effect of the NP treatment was related to different concentrations of NO3, which directly influenced the biomass of phytoplankton. Additionally, low inorganic NP ratio reduced the seston NP and Chl a-C ratios, and there were some effects on the plankton community composition, e.g. benefitting Synechococcus spp in some communities.

  • Open Access English
    Authors: 
    Gustafsson, Erik; Hagens, Mathilde; Sun, Xiaole; Reed, Daniel C.; Humborg, Christoph; Slomp, Caroline P.; Gustafsson, Bo G.;
    Project: EC | PHOXY (278364), NWO | Response of the Iron Biog... (11124)

    Enhanced release of alkalinity from the seafloor, principally driven by anaerobic degradation of organic matter under low-oxygen conditions and associated secondary redox reactions, can increase the carbon dioxide (CO2) buffering capacity of seawater and therefore oceanic CO2 uptake. The Baltic Sea has undergone severe changes in oxygenation state and total alkalinity (TA) over the past decades. The link between these concurrent changes has not yet been investigated in detail. A recent system-wide TA budget constructed for the past 50 years using BALTSEM, a coupled physical–biogeochemical model for the whole Baltic Sea area revealed an unknown TA source. Here we use BALTSEM in combination with observational data and one-dimensional reactive-transport modeling of sedimentary processes in the Fårö Deep, a deep Baltic Sea basin, to test whether sulfate (SO42-) reduction coupled to iron (Fe) sulfide burial can explain the missing TA source in the Baltic Proper. We calculated that this burial can account for up to 26 % of the missing source in this basin, with the remaining TA possibly originating from unknown river inputs or submarine groundwater discharge. We also show that temporal variability in the input of Fe to the sediments since the 1970s drives changes in sulfur (S) burial in the Fårö Deep, suggesting that Fe availability is the ultimate limiting factor for TA generation under anoxic conditions. The implementation of projected climate change and two nutrient load scenarios for the 21st century in BALTSEM shows that reducing nutrient loads will improve deep water oxygen conditions, but at the expense of lower surface water TA concentrations, CO2 buffering capacities and faster acidification. When these changes additionally lead to a decrease in Fe inputs to the sediment of the deep basins, anaerobic TA generation will be reduced even further, thus exacerbating acidification. This work highlights that Fe dynamics plays a key role in the release of TA from sediments where Fe sulfide formation is limited by Fe availability, as exemplified by the Baltic Sea. Moreover, it demonstrates that burial of Fe sulfides should be included in TA budgets of low-oxygen basins.

  • Open Access
    Authors: 
    Barrett, P. J.;
    Publisher: PANGAEA
    Country: Germany
Advanced search in Research products
Research products
arrow_drop_down
Searching FieldsTerms
Any field
arrow_drop_down
includes
arrow_drop_down
Include:
The following results are related to European Marine Science. Are you interested to view more results? Visit OpenAIRE - Explore.
69 Research products, page 1 of 7
  • Open Access English
    Authors: 
    Mogollón, J. M.; Dale, A. W.; Fossing, H.; Regnier, P.;
    Project: EC | BONUS+ (217246)

    Arkona Basin (southwestern Baltic Sea) is a seasonally-hypoxic basin characterized by the presence of free methane gas in its youngest organic-rich muddy stratum. Through the use of reactive transport models, this study tracks the development of the methane geochemistry in Arkona Basin as this muddy sediment became deposited during the last 8 kyr. Four cores are modeled each pertaining to a unique geochemical scenario according to their respective contemporary geochemical profiles. Ultimately the thickness of the muddy sediment and the flux of particulate organic carbon are crucial in determining the advent of both methanogenesis and free methane gas, the timescales over which methanogenesis takes over as a dominant reaction pathway for organic matter degradation, and the timescales required for free methane gas to form.

  • Open Access English
    Authors: 
    Karlsson, Mikael; Gilek, Michael; Lundberg, Cecilia;
    Publisher: Springer International Publishing
  • Open Access English
    Authors: 
    Asanti, Tuomas;
    Publisher: Yrkeshögskolan Arcada
    Country: Finland

    The aim of this thesis was to study how small logistics sector and fish sector companies in Kymenlaakso region have experienced the effects of Russia’s counter-sanctions. The main research questions in the study were “Have the Russia’s counter-sanctions affected companies’ businesses in Kymenlaakso region?”, “What kind of effect(s) have the companies identified and encountered?”, “What measures have companies taken regarding the situation?” and “Have the companies tried to find new markets for their products or services?”. The primary research method in this study was a semi-structured interview. The author of this thesis interviewed professionals and experts from different companies from the chosen sectors during spring 2015. The findings show that small companies in the logistics sector and fish sector have experienced either direct or indirect effects that have been caused by the counter-sanctions. Main challenges for the fish sector are decreases in producer prices and tightened competition in the European Union area. The logistics sector has experienced difficulties due to tightened liquidity conditions. There have also been bankruptcies in the logistics sector directly caused by the counter-sanctions. Companies in both sectors have been forced to look for alternative markets, postpone investments and lay-off or terminate personnel. Scepticism and uncertainty regarding trade with Russian customers and companies have emerged. On a national level, Finland’s container balance has been negatively affected partly due to the counter-sanctions. The scope of this study is limited to small fish sector and logistics sector companies in Kymenlaakso region. Also, due to the qualitative nature of the primary research method the findings of this study are not generalizable to the public. Tämän opinnäytetyön tarkoituksena oli tarkastella sitä miten pienet logistiikka –ja kalasektorin yritykset Kymenlaakson alueella ovat kokeneet Venäjän asettamien vastapakotteiden vaikutukset. Opinnäytetyön tutkimuskysymykset olivat ”Ovatko Venäjän vastapakotteet vaikuttaneet yritysten toimintaan Kymenlaakson alueella?”, ”Millaisia vaikutuksia yritykset ovat kohdanneet ja identifioineet?”, ”Mitä toimenpiteitä yritykset ovat tehneet tilanteeseen liittyen?” ja ”Ovatko yritykset pyrkineet löytämään tuotteilleen tai palveluilleen uusia markkinoita?”. Tämän opinnäytetyön ensisijainen tutkimusmenetelmä oli semistrukturoitu haastattelu. Opinnäytetyön tekijä haastatteli asiantuntijoita sekä ammattilaisia valituilta sektoreilta kevään 2015 aikana. Tulokset näyttävät, että pienet logistiikka –ja kalasektorin yritykset ovat kohdanneet joko suoria tai epäsuoria vastapakotteiden aiheuttamia vaikutuksia. Keskeisimmät haasteet kalasektorilla johtuvat tuottajahintojen laskusta sekä kiristyneestä kilpailuista Euroopan Union alueella. Logistiikkasektorilla on kohdannut vaikeuksia, jotka ovat johtuneet yritysten hankaloituneesta likviditeettitilanteesta. Myös vastapakotteiden suoraan aiheuttamia konkursseja on havaittu. Molempien sektorien yritykset ovat joutuneet etsimään tuotteilleen tai palveluilleen uusia markkinoita, viivästyttämään investointeja sekä lomauttamaan tai irtisanomaan henkilöstöä. Skeptisyys sekä epävarmuus kaupankäynnissä venäläisten asiakkaiden sekä yritysten kanssa on noussut esiin. Kansallisella tasolla vastapakotteilla on osaltaan ollut negatiivinen vaikutus Suomen konttitasapainoon. Tämän opinnäytetyö on rajoitettu tarkastelemaan pieniä logistiikka – ja kalasektorin yrityksiä Kymenlaakson alueella. Lisäksi, johtuen kvalitatiivisesta tutkimusmenetelmästä tämän opinnäytetyön tuloksia ei voida pitää yleistettävinä muihin yrityksiin.

  • Open Access English
    Authors: 
    Ssebugere, Patrick;
    Publisher: Lappeenranta University of Technology
    Country: Finland

    This thesis describes the occurrence and sources of selected persistent organic pollutants (POPs) such as polychlorinated dibenzo-p-dioxins (PCDDs), polychlorinated dibenzofurans (PCDFs), polychlorinated biphenyls (PCBs), polybrominated diphenyl ethers (PBDEs) and hexachlorocyclohexanes (HCHs) in the northern watershed of Lake Victoria. Sediments and fish were collected from three highly polluted embayments (i.e. Murchison Bay, Napoleon Gulf and Thurston Bay) of the lake. The analysis for PCDD/Fs, PCBs and PBDEs was done using a high resolution mass spectrometer coupled to a gas chromatograph (GC), and a GC equipped with an electron capture detector was used for HCHs. Total (Σ) PCDD/Fs, PCBs and PBDEs in sediments ranged from 3.19 to 478, 313 to 4325 and 60.8 to 179 pg g-1 dry weight (dw), respectively. The highest concentrations of pollutants were found at sites close to industrial areas and wastewater discharge points. The maximum concentrations of PCDD/Fs, PCBs, PBDEs and HCHs in fish muscle homogenates were 49, 779, 495 and 45,900 pg g-1 wet weight (ww), respectively. The concentrations of the pollutants in Nile perch (Lates niloticus) were significantly greater than those in Nile tilapia (Oreochromis niloticus), possibly due to differences in trophic level and dietary feeding habits among fish species. World Health Organization-toxic equivalency quotient (WHO2005-TEQ) values in the sediments were up to 4.24 pg g-1 dw for PCDD/Fs and 0.55 pg TEQ g-1 dw for the 12 dioxin-like PCBs (dl-PCBs). 23.1% of the samples from the Napoleon Gulf were above the interim sediment quality guideline value of 0.85 pg WHO-TEQ g-1 dw set by the Canadian Council for Ministers of the Environment. The WHO2005-TEQs in fish were 0.001-0.16 pg g-1 for PCDD/Fs and 0.001-0.31 pg g-1 ww for dl- PCBs. The TEQ values were within a permissible level of 3.5 pg g−1 ww recommended by the European Commission. Based on the Commission set TEQs and minimum risk level criteria formulated by the Agency for Toxic Substances and Disease Registry, the consumption of fish from Lake Victoria gives no indication of health risks associated to PCDD/Fs and PCBs. Principal component analysis (PCA) indicated that anthropogenic activities such as agricultural straw open burning, medical waste incinerators and municipal solid waste combustors were the major sources of PCDD/Fs in the watershed of Lake Victoria. The ratios of α-/γ-HCH varied from 0.89 to 1.68 suggesting that the highest HCH residues mainly came from earlier usage and fresh γ-HCH (lindane). In the present study, the concentration of POPs in fish were not significantly related to those in sediments, and the biota sediment accumulation factor (BSAF) concept was found to be a poor predictor of the bioavailability and bioaccumulation of environmental pollutants.

  • Open Access English
    Authors: 
    Dinh, Ngoc Thi;
    Publisher: Yrkeshögskolan Novia
    Country: Finland

    Purpose: Identify impacts of Song Bung 4 Hydropower project to diversity and hydrology; Criticise on mitigation practice and impacts. Method: Screen of impacts from records of other projects and mitigations; Compare with identified impacts and mitigation practices. Findings: Direct lost of some species; environmental flow is not implemented regularly; higher fish yield in reservoir; threaten migratory fish

  • Open Access
    Authors: 
    Lochte, Karin;
    Publisher: PANGAEA
    Country: Germany
  • Open Access English
    Authors: 
    Pham, Thanh Huyen;
    Publisher: Satakunnan ammattikorkeakoulu
    Country: Finland

    Analyzing and improving marketing strategies of Thien Hong Joint Stock company - a newborn company in the field of sea freight forwarding service in Vietnam. This thesis focused on the 4Ps (product, price, placement, promotion) in marketing strategy, how to apply the theory of services marketing in a business to business company and a special industry effectively.

  • English
    Authors: 
    Spilling, Kristian;
    Publisher: PANGAEA - Data Publisher for Earth & Environmental Science
    Project: AKA | Changing phytoplankton co... (259164), EC | ASSEMBLE (227799)

    In an enclosure experiment, we employed two levels of inorganic NP ratios (10 and 5) for three distinct plankton communities collected along the coast of central Chile (33ºS). Each combination of community and NP level was replicated three times. The experiment lasted 12 days, and the data set include inorganic nutrients (NO3, PO4, DSi), particular organic carbon (POC), nitrogen (PON) and phosphorus (POP), Chlorophyll a, a range of fluorescence based measurements such as photochemical efficiency (Fv/Fm) and community data. The primary effect of the NP treatment was related to different concentrations of NO3, which directly influenced the biomass of phytoplankton. Additionally, low inorganic NP ratio reduced the seston NP and Chl a-C ratios, and there were some effects on the plankton community composition, e.g. benefitting Synechococcus spp in some communities.

  • Open Access English
    Authors: 
    Gustafsson, Erik; Hagens, Mathilde; Sun, Xiaole; Reed, Daniel C.; Humborg, Christoph; Slomp, Caroline P.; Gustafsson, Bo G.;
    Project: EC | PHOXY (278364), NWO | Response of the Iron Biog... (11124)

    Enhanced release of alkalinity from the seafloor, principally driven by anaerobic degradation of organic matter under low-oxygen conditions and associated secondary redox reactions, can increase the carbon dioxide (CO2) buffering capacity of seawater and therefore oceanic CO2 uptake. The Baltic Sea has undergone severe changes in oxygenation state and total alkalinity (TA) over the past decades. The link between these concurrent changes has not yet been investigated in detail. A recent system-wide TA budget constructed for the past 50 years using BALTSEM, a coupled physical–biogeochemical model for the whole Baltic Sea area revealed an unknown TA source. Here we use BALTSEM in combination with observational data and one-dimensional reactive-transport modeling of sedimentary processes in the Fårö Deep, a deep Baltic Sea basin, to test whether sulfate (SO42-) reduction coupled to iron (Fe) sulfide burial can explain the missing TA source in the Baltic Proper. We calculated that this burial can account for up to 26 % of the missing source in this basin, with the remaining TA possibly originating from unknown river inputs or submarine groundwater discharge. We also show that temporal variability in the input of Fe to the sediments since the 1970s drives changes in sulfur (S) burial in the Fårö Deep, suggesting that Fe availability is the ultimate limiting factor for TA generation under anoxic conditions. The implementation of projected climate change and two nutrient load scenarios for the 21st century in BALTSEM shows that reducing nutrient loads will improve deep water oxygen conditions, but at the expense of lower surface water TA concentrations, CO2 buffering capacities and faster acidification. When these changes additionally lead to a decrease in Fe inputs to the sediment of the deep basins, anaerobic TA generation will be reduced even further, thus exacerbating acidification. This work highlights that Fe dynamics plays a key role in the release of TA from sediments where Fe sulfide formation is limited by Fe availability, as exemplified by the Baltic Sea. Moreover, it demonstrates that burial of Fe sulfides should be included in TA budgets of low-oxygen basins.

  • Open Access
    Authors: 
    Barrett, P. J.;
    Publisher: PANGAEA
    Country: Germany