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  • Frontiers  (2)
  • AMS (American Meteorological Society)  (1)
  • Association for the Sciences of Limnology and Oceanography  (1)
  • 1
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    Momentum balance in zonal flows and resonance of baroclinic Rossby waves (1999)
    AMS (American Meteorological Society)
    In:  Journal of Physical Oceanography, 29 . pp. 1666-1681.
    Details
    Publication Date: 2020-08-04
    Description: Wind-driven flow in a baroclinic quasigeostrophic channel with simple bottom topography is studied in a model with reduced physics and degrees of freedom as an analogy to the Antarctic Circumpolar Current. For a sinusoidal topography an approximate analytical solution is found using a low-order spectral model. Resonance of baroclinic Rossby waves can lead to different flow regimes of which one is a blocked state, where most of the momentum, imparted to the fluid by the wind stress, is transferred to the earth by bottom form stress. For some parameter values there are both resonant and nonresonant solutions to the model equations. It is shown that these results of the low-order model apply also to a more complicated spectral model with sinusoidal but also with Gaussian ridge topography. The steady states of these models are found numerically using a continuation algorithm. In the case of the ridge topography, the resonant and nonresonant steady states coexist over a wide range of topography heights.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1175/1520-0485(1999)029〈1666:MBIZFA〉2.0.CO;2
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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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
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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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)
  • 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
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    PAPER (OA)
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