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    Global assessment of ocean carbon export by combining satellite observations and food-web models

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    Date
    2014-03-10
    Author
    Siegel, David A.  Concept link
    Buesseler, Ken O.  Concept link
    Doney, Scott C.  Concept link
    Sailley, Sevrine F.  Concept link
    Behrenfeld, Michael J.  Concept link
    Boyd, Philip W.  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/6668
    As published
    https://doi.org/10.1002/2013GB004743
    DOI
    10.1002/2013GB004743
    Keyword
     Carbon cycle; Biological pump; Carbon export; Remote sensing; Food webs 
    Abstract
    The export of organic carbon from the surface ocean by sinking particles is an important, yet highly uncertain, component of the global carbon cycle. Here we introduce a mechanistic assessment of the global ocean carbon export using satellite observations, including determinations of net primary production and the slope of the particle size spectrum, to drive a food-web model that estimates the production of sinking zooplankton feces and algal aggregates comprising the sinking particle flux at the base of the euphotic zone. The synthesis of observations and models reveals fundamentally different and ecologically consistent regional-scale patterns in export and export efficiency not found in previous global carbon export assessments. The model reproduces regional-scale particle export field observations and predicts a climatological mean global carbon export from the euphotic zone of ~6 Pg C yr−1. Global export estimates show small variation (typically < 10%) to factor of 2 changes in model parameter values. The model is also robust to the choices of the satellite data products used and enables interannual changes to be quantified. The present synthesis of observations and models provides a path for quantifying the ocean's biological pump.
    Description
    Author Posting. © American Geophysical Union, 2014. 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 28 (2014): 181-196, doi:10.1002/2013GB004743.
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    • Marine Chemistry and Geochemistry (MC&G)
    Suggested Citation
    Global Biogeochemical Cycles 28 (2014): 181-196
     

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