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  • Nature Publishing Group  (3)
  • Wiley  (2)
  • AMER GEOPHYSICAL UNION  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Carbon cycle Marine manipulations (2007)
    [s.l.] : Nature Publishing Group
    Nature 450 (2007), S. 491-492 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Marine phytoplankton are major players in the carbon cycle, accounting for about 50% of the global biological uptake of carbon dioxide. Near the ocean surface, these single-celled organisms use light energy to convert CO2 into organic molecules for building cellular structures and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/450491a
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Marine microorganisms and global nutrient cycles (2005)
    [s.l.] : Nature Publishing Group
    Nature 437 (2005), S. 349-355 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The way that nutrients cycle through atmospheric, terrestrial, oceanic and associated biotic reservoirs can constrain rates of biological production and help structure ecosystems on land and in the sea. On a global scale, cycling of nutrients also affects the concentration of atmospheric carbon ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature04159
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    Paper (German National Licenses)
    Fulltext
  • 3
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    The influence of salinity and temperature covariation on the photophysiological characteristics of Antarctic sea ice microalgae (1992)
    Wiley
    In:  Journal of Phycology, 28 (6). pp. 746-756.
    Details
    Publication Date: 2017-11-29
    Description: The responses of sea ice microalgae to variation in ambient irradiance (0 to 150 μE · m−2· s−1), temperature (–6° to + 6° C), and salinity (0 to 100 ppt) were tested to determine whether these variables act independently or in concert to influence rates of microalgal photosynthesis. The photosynthetic efficiency and maximum photosynthetic rate for sea ice microalgae increased as a function of incubation temperature between -6° and + 6° C. Furthermore, photosynthetic efficiency, maximum photosynthetic rate, and quantum yield were greatest at salinities between SO and 50 ppt. In contrast, the mean specific absorption coefficients were lowest near seawater salinities, and the saturating irradiance, Is, appeared to be inversely proportional to salinity. Results also suggest that the effects of salinity on the growth of sea ice microalgae are independent of those elicited by temperature or light, and that the functional relationship between salinity and light or temperature is multiplicative. This information is essential to the proper formulation of algorithms used to describe algal growth in environments where light, temperature, and salinity are changing simultaneously, such as within sea ice or within the water column at the marginal ice edge zone.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1111/j.0022-3646.1992.00746.x
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 4
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    Magnitude of oceanic nitrogen fixation influenced by the nutrient uptake ratio of phytoplankton (2010)
    Nature Publishing Group
    In:  Nature Geoscience, 3 (6). pp. 412-416.
    Details
    Publication Date: 2017-12-21
    Description: The elemental stoichiometry of sea water and particulate organic matter is remarkably similar. This observation led Redfield to hypothesize that the oceanic ratio of nitrate to phosphate is controlled by the remineralization of phytoplankton biomass1. The Redfield ratio is used universally to quantitatively link the marine nitrogen and phosphorus cycles in numerous biogeochemical applications2,3,4. Yet, empirical and theoretical studies show that the ratio of nitrogen to phosphorus in phytoplankton varies greatly with taxa5,6 and growth conditions7,8,9. Here we present a dynamic five-box ecosystem model showing that non-Redfield utilization of dissolved nitrogen and phosphorus by non-nitrogen-fixing phytoplankton controls the magnitude and distribution of nitrogen fixation. In our simulations, systems dominated by rapidly growing phytoplankton with low nitrogen to phosphorus uptake ratios reduce the phosphorus available for nitrogen fixation. In contrast, in systems dominated by slow-growing phytoplankton with high nitrogen to phosphorus uptake ratios nitrogen deficits are enhanced, and nitrogen fixation is promoted. We show that estimates of nitrogen fixation are up to fourfold too high when non-Redfield uptake stoichiometries are ignored. We suggest that the relative abundance of fast- and slow-growing phytoplankton controls the amount of new nitrogen added to the ocean.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1038/NGEO856
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 5
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    Insignificant buffering capacity of Antarctic shelf carbonates (2013)
    AGU (American Geophysical Union) | Wiley
    In:  Global Biogeochemical Cycles, 27 (1). pp. 11-20.
    Details
    Publication Date: 2016-05-02
    Description: We combined data sets of measured sedimentary calcium carbonate (CaCO3) and satellite-derived pelagic primary production to parameterize the relation between CaCO3 content on the Antarctic shelves and primary production in the overlying water column. CaCO3 content predicted in this way was in good agreement with the measured data. The parameterization was then used to chart CaCO3 content on the Antarctic shelves all around the Antarctic, using the satellite-derived primary production. The total inventory of CaCO3 in the bioturbated layer of Antarctic shelf sediments was estimated to be 0.5 Pg C. This quantity is comparable to the total CO2 uptake by the Southern Ocean in only one to a few years (dependent on the uptake estimate and area considered), indicating that the dissolution of these carbonates will neither delay ocean acidification in this area nor augment the Southern Ocean CO2 uptake capacity.
    Type: Article , PeerReviewed
    Format: text
    DOI: 10.1029/2011GB004211
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 6
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    Insignificant buffering capacity of Antarctic shelf carbonates (2013)
    AMER GEOPHYSICAL UNION
    In:  EPIC3Global Biogeochemical Cycles, AMER GEOPHYSICAL UNION, 27, pp. 1-10, ISSN: 0886-6236
    Details
    Publication Date: 2019-07-17
    Description: We combined data sets of measured sedimentary calcium carbonate (CaCO3) and satellite-derived pelagic primary production to parameterize the relation between CaCO3 content on the Antarctic shelves and primary production in the overlying water column. CaCO3 content predicted in this way was in good agreement with the measured data. The parameterization was then used to chart CaCO3 content on the Antarctic shelves all around the Antarctic, using the satellite-derived primary production. The total inventory of CaCO3 in the bioturbated layer of Antarctic shelf sediments was estimated to be 0.5 Pg C. This quantity is comparable to the total CO2 uptake by the Southern Ocean in only one to a few years (dependent on the uptake estimate and area considered), indicating that the dissolution of these carbonates will neither delay ocean acidification in this area nor augment the Southern Ocean CO2 uptake capacity.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
    Format: application/pdf
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