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    Impact of circulation on export production, dissolved organic matter, and dissolved oxygen in the ocean : results from Phase II of the Ocean Carbon-cycle Model Intercomparison Project (OCMIP-2)

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    2006GB002857.pdf (495.8Kb)
    Date
    2007-08-08
    Author
    Najjar, Raymond G.  Concept link
    Jin, X.  Concept link
    Louanchi, F.  Concept link
    Aumont, Olivier  Concept link
    Caldeira, Ken  Concept link
    Doney, Scott C.  Concept link
    Dutay, J.-C.  Concept link
    Follows, Michael J.  Concept link
    Gruber, Nicolas  Concept link
    Joos, Fortunat  Concept link
    Lindsay, Keith  Concept link
    Maier-Reimer, Ernst  Concept link
    Matear, Richard J.  Concept link
    Matsumoto, K.  Concept link
    Monfray, Patrick  Concept link
    Mouchet, Anne  Concept link
    Orr, James C.  Concept link
    Plattner, Gian-Kasper  Concept link
    Sarmiento, Jorge L.  Concept link
    Schlitzer, Reiner  Concept link
    Slater, Richard D.  Concept link
    Weirig, Marie-France  Concept link
    Yamanaka, Yasuhiro  Concept link
    Yool, Andrew  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3405
    As published
    https://doi.org/10.1029/2006GB002857
    DOI
    10.1029/2006GB002857
    Keyword
     Export production; Numerical modeling; Ocean circulation 
    Abstract
    Results are presented of export production, dissolved organic matter (DOM) and dissolved oxygen simulated by 12 global ocean models participating in the second phase of the Ocean Carbon-cycle Model Intercomparison Project. A common, simple biogeochemical model is utilized in different coarse-resolution ocean circulation models. The model mean (±1σ) downward flux of organic matter across 75 m depth is 17 ± 6 Pg C yr−1. Model means of globally averaged particle export, the fraction of total export in dissolved form, surface semilabile dissolved organic carbon (DOC), and seasonal net outgassing (SNO) of oxygen are in good agreement with observation-based estimates, but particle export and surface DOC are too high in the tropics. There is a high sensitivity of the results to circulation, as evidenced by (1) the correlation of surface DOC and export with circulation metrics, including chlorofluorocarbon inventory and deep-ocean radiocarbon, (2) very large intermodel differences in Southern Ocean export, and (3) greater export production, fraction of export as DOM, and SNO in models with explicit mixed layer physics. However, deep-ocean oxygen, which varies widely among the models, is poorly correlated with other model indices. Cross-model means of several biogeochemical metrics show better agreement with observation-based estimates when restricted to those models that best simulate deep-ocean radiocarbon. Overall, the results emphasize the importance of physical processes in marine biogeochemical modeling and suggest that the development of circulation models can be accelerated by evaluating them with marine biogeochemical metrics.
    Description
    Author Posting. © American Geophysical Union, 2007. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Global Biogeochemical Cycles 21 (2007): GB3007, doi:10.1029/2006GB002857.
    Collections
    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Global Biogeochemical Cycles 21 (2007): GB3007
     

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