Efficient dissolved organic carbon production and export in the oligotrophic ocean.
Efficient dissolved organic carbon production and export in the oligotrophic ocean.
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DOI:
10.1038/s41467-017-02227-3
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发表时间:
2017-12-11
影响因子:
16.6
通讯作者:
DeVries T
中科院分区:
文献类型:
--
作者:
Roshan S;DeVries T
Biologically fixed carbon is transferred from the surface to deep ocean as sinking particles or dissolved organic carbon (DOC). DOC is estimated to account for ~20% of global export production, but the degree to which this varies regionally has not been assessed at a global scale. Here we present the first observationally based global-scale assessment of DOC production and export, obtained by combining an artificial neural network estimate of the global DOC distribution, and a data-constrained ocean circulation model. Our results demonstrate that the efficiency of DOC production and export varies more than threefold across oceanographic regions. DOC production and export display a pronounced peak in the oligotrophic subtropical oceans, where DOC accounts for roughly half of the total organic carbon export. These stratified nutrient-depleted regions are expected to expand with future warming, amplifying the role of DOC in the biological pump, and magnifying the need to improve DOC cycling in climate models. The degree of regional variability in marine dissolved organic carbon (DOC) export production is poorly constrained on a global scale. Here, the authors combine an artificial neural network and a data-constrained ocean circulation model to show that the efficiency of DOC export varies 3-fold across regions.
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