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    How does ocean biology affect atmospheric pCO2? Theory and models

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    Article (7.201Mb)
    Figure S1: Surface preformed PO43− in the control GCMs, change in surface preformed PO43− due to Southern Ocean nutrient depletion and due to global nutrient depletion. (1.848Mb)
    Additional file information (1.760Kb)
    Date
    2008-07-22
    Author
    Marinov, Irina  Concept link
    Follows, Michael J.  Concept link
    Gnanadesikan, Anand  Concept link
    Sarmiento, Jorge L.  Concept link
    Slater, Richard D.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3663
    As published
    https://doi.org/10.1029/2007JC004598
    DOI
    10.1029/2007JC004598
    Keyword
     Carbon cycle; Preformed nutrient; Nutrient depletion 
    Abstract
    This paper examines the sensitivity of atmospheric pCO2 to changes in ocean biology that result in drawdown of nutrients at the ocean surface. We show that the global inventory of preformed nutrients is the key determinant of atmospheric pCO2 and the oceanic carbon storage due to the soft-tissue pump (OCS soft ). We develop a new theory showing that under conditions of perfect equilibrium between atmosphere and ocean, atmospheric pCO2 can be written as a sum of exponential functions of OCS soft . The theory also demonstrates how the sensitivity of atmospheric pCO2 to changes in the soft-tissue pump depends on the preformed nutrient inventory and on surface buffer chemistry. We validate our theory against simulations of nutrient depletion in a suite of realistic general circulation models (GCMs). The decrease in atmospheric pCO2 following surface nutrient depletion depends on the oceanic circulation in the models. Increasing deep ocean ventilation by increasing vertical mixing or Southern Ocean winds increases the atmospheric pCO2 sensitivity to surface nutrient forcing. Conversely, stratifying the Southern Ocean decreases the atmospheric CO2 sensitivity to surface nutrient depletion. Surface CO2 disequilibrium due to the slow gas exchange with the atmosphere acts to make atmospheric pCO2 more sensitive to nutrient depletion in high-ventilation models and less sensitive to nutrient depletion in low-ventilation models. Our findings have potentially important implications for both past and future climates.
    Description
    Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research 113 (2008): C07032, doi:10.1029/2007JC004598.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Journal of Geophysical Research 113 (2008): C07032
     

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