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    Dissolved organic carbon pools and export from the coastal ocean

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    Barr-n_et_al-2015-Global_Biogeochemical_Cycles.pdf
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    Type
    Article
    Authors
    Barrón, Cristina
    Duarte, Carlos M. cc
    KAUST Department
    Biological and Environmental Sciences and Engineering (BESE) Division
    Marine Science Program
    Red Sea Research Center (RSRC)
    Date
    2015-10-21
    Online Publication Date
    2015-10-21
    Print Publication Date
    2015-10
    Permanent link to this record
    http://hdl.handle.net/10754/582468
    
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    Abstract
    The distribution of dissolved organic carbon (DOC) concentration across coastal waters was characterized based on the compilation of 3510 individual estimates of DOC in coastal waters worldwide. We estimated the DOC concentration in the coastal waters that directly exchange with open ocean waters in two different ways, as the DOC concentration at the edge of the shelf break and as the DOC concentration in coastal waters with salinity close to the average salinity in the open ocean. Using these estimates of DOC concentration in the coastal waters that directly exchange with open ocean waters, the mean DOC concentration in the open ocean and the estimated volume of water annually exchanged between coastal and open ocean, we estimated a median ± SE (and average ± SE) global DOC export from coastal to open ocean waters ranging from 4.4 ± 1.0 Pg C yr−1 to 27.0 ± 1.8 Pg C yr−1 (7.0 ± 5.8 Pg C yr−1 to 29.0 ± 8.0 Pg C yr−1) depending on the global hydrological exchange. These values correspond to a median and mean median (and average) range between 14.7 ± 3.3 to 90.0 ± 6.0 (23.3 ± 19.3 to 96.7 ± 26.7) Gg C yr−1 per km of shelf break, which is consistent with the range between 1.4 to 66.1 Gg C yr−1 per km of shelf break of available regional estimates of DOC export. The estimated global DOC export from coastal to open ocean waters is also consistent with independent estimates of the net metabolic balance of the coastal ocean. The DOC export from the coastal to the open ocean is likely to be a sizeable flux and is likely to be an important term in the carbon budget of the open ocean, potentially providing an important subsidy to support heterotrophic activity in the open ocean.
    Citation
    Dissolved organic carbon pools and export from the coastal ocean 2015, 29 (10):1725 Global Biogeochemical Cycles
    Publisher
    American Geophysical Union (AGU)
    Journal
    Global Biogeochemical Cycles
    DOI
    10.1002/2014GB005056
    Additional Links
    http://doi.wiley.com/10.1002/2014GB005056
    ae974a485f413a2113503eed53cd6c53
    10.1002/2014GB005056
    Scopus Count
    Collections
    Articles; Biological and Environmental Science and Engineering (BESE) Division; Red Sea Research Center (RSRC); Marine Science Program

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