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  • Frontiers  (2)
  • Association for the Sciences of Limnology and Oceanography  (1)
  • Copernicus Publications  (1)
  • 1
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    Emergent interactive effects of climate change and contaminants in coastal and ocean ecosystems (2022)
    Frontiers
    Details
    Publication Date: 2024-02-07
    Description: The effects of climate change (CC) on contaminants and their potential consequences to marine ecosystem services and human wellbeing are of paramount importance, as they pose overlapping risks. Here, we discuss how the interaction between CC and contaminants leads to poorly constrained impacts that affects the sensitivity of organisms to contamination leading to impaired ecosystem function, services and risk assessment evaluations. Climate drivers, such as ocean warming, ocean deoxygenation, changes in circulation, ocean acidification, and extreme events interact with trace metals, organic pollutants, excess nutrients, and radionuclides in a complex manner. Overall, the holistic consideration of the pollutants-climate change nexus has significant knowledge gaps, but will be important in understanding the fate, transport, speciation, bioavailability, toxicity, and inventories of contaminants. Greater focus on these uncertainties would facilitate improved predictions of future changes in the global biogeochemical cycling of contaminants and both human health and marine ecosystems.
    Type: Article , PeerReviewed
    Format: text
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    IMPACT OF DIATOM Si:N STOICHIOMETRY ON MARINE PRODUCTION AND PARTICLE EXPORT IN A GLOBAL MODEL (2012)
    Association for the Sciences of Limnology and Oceanography
    In:  EPIC32012 ASLO Aquatic Sciences Meeting, Japan, 2012-07-08-2012-07-13Shiga, Japan, Association for the Sciences of Limnology and Oceanography
    Details
    Publication Date: 2019-07-17
    Description: Diatoms play an essential role in marine biogeochemical cycles by their large contribution to primary production and particle export. Under nutrient limitation, diatom biomass often exhibits large deviations from the Redfield ratio. Here a biogeochemical ocean general circulation model is applied to investigate the influence of variations in diatom stoichiometry. The ecosystem model allows for variable Chl:C:N:Si stoichiometry in phytoplankton biomass regulated by light and availability of macronutrients (nitrate, silicic acid) and iron. Two size classes of phytoplankton are considered with the larger representing diatoms. After 5 years of simulation, the surface distributions of both phytoplankton groups are in a reasonable cyclostationary state. Compared to the ‘steady’ state, a sensitivity simulation with fixed diatom stoichiometry for Si:N of 1.2:1 showed a slight shift from small phytoplankton to diatoms leading to a shift in primary production between two groups. Total primary and export production were conservative, indicating a tendency for compensation. In the Southern Ocean, less opal production and decreased particle export ratio of Si:N resulted in raising silicic acid to the south of Subantarctic Front elucidating the importance of decoupling of different elemental cycles.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Conference , notRev
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    PAPER (OA)
  • 3
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    A skill assessment of the biogeochemical model REcoM2 coupled to the Finite Element Sea Ice–Ocean Model (FESOM 1.3) (2014)
    Copernicus Publications
    In:  EPIC3Geoscientific Model Development, Copernicus Publications, 7(6), pp. 2769-2802
    Details
    Publication Date: 2014-11-27
    Description: In coupled biogeochmical–ocean models, the choice of numerical schemes in the ocean circulation component can have a large influence on the distribution of the biological tracers. Biogeochemical models are traditionally coupled to ocean general circulation models (OGCMs), which are based on dynamical cores employing quasi-regular meshes, and therefore utilize limited spatial resolution in a global setting. An alternative approach is to use an unstructured-mesh ocean model, which allows variable mesh resolution. Here, we present initial results of a coupling between the Finite Element Sea Ice–Ocean Model (FESOM) and the biogeochemical model REcoM2 (Regulated Ecosystem Model 2), with special focus on the Southern Ocean. Surface fields of nutrients, chlorophyll a and net primary production (NPP) were compared to available data sets with a focus on spatial distribution and seasonal cycle. The model produces realistic spatial distributions, especially regarding NPP and chlorophyll a, whereas the iron concentration becomes too low in the Pacific Ocean. The modelled NPP is 32.5 Pg C yr−1 and the export production 6.1 Pg C yr−1, which is lower than satellite-based estimates, mainly due to excessive iron limitation in the Pacific along with too little coastal production. The model performs well in the Southern Ocean, though the assessment here is hindered by the lower availability of observations. The modelled NPP is 3.1 Pg C yr−1 in the Southern Ocean and the export production 1.1 Pg C yr−1. All in all, the combination of a circulation model on an unstructured grid with a biogeochemical–ocean model shows similar performance to other models at non-eddy-permitting resolution. It is well suited for studies of the Southern Ocean, but on the global scale deficiencies in the Pacific Ocean would have to be taken into account.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
    Format: application/zip
    Location Call Number Limitation Availability
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    PAPER (OA)
  • 4
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    Emergent interactive effects of climate change and contaminants in coastal and ocean ecosystems (2022)
    Frontiers
    In:  EPIC3Frontiers in Marine Science, Frontiers, 9, pp. 936109-936109, ISSN: 2296-7745
    Details
    Publication Date: 2024-03-03
    Description: The effects of climate change (CC) on contaminants and their potential consequences to marine ecosystem services and human wellbeing are of paramount importance, as they pose overlapping risks. Here, we discuss how the interaction between CC and contaminants leads to poorly constrained impacts that affects the sensitivity of organisms to contamination leading to impaired ecosystem function, services and risk assessment evaluations. Climate drivers, such as ocean warming, ocean deoxygenation, changes in circulation, ocean acidification, and extreme events interact with trace metals, organic pollutants, excess nutrients, and radionuclides in a complex manner. Overall, the holistic consideration of the pollutants-climate change nexus has significant knowledge gaps, but will be important in understanding the fate, transport, speciation, bioavailability, toxicity, and inventories of contaminants. Greater focus on these uncertainties would facilitate improved predictions of future changes in the global biogeochemical cycling of contaminants and both human health and marine ecosystems.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    PAPER (OA)
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