Dissolved Organic Carbon in the North Atlantic Meridional Overturning Circulation | Zendy

Marcos Fontela | Zendy; Maribel I. GarcíaIbáñez | Zendy; Dennis A. Hansell | Zendy; Herlé Mercier | Zendy; Fı́z F. Pérez | Zendy

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Dissolved Organic Carbon in the North Atlantic Meridional Overturning Circulation

Author(s) -

Marcos Fontela,

Maribel I. GarcíaIbáñez,

Dennis A. Hansell,

Herlé Mercier,

Fı́z F. Pérez

Publication year - 2016

Publication title -

scientific reports

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.24

H-Index - 213

ISSN - 2045-2322

DOI - 10.1038/srep26931

Subject(s) - dissolved organic carbon , oceanography , shutdown of thermohaline circulation , thermohaline circulation , north atlantic deep water , subtropics , environmental science , zonal and meridional , geology , water mass , tropical atlantic , climatology , sea surface temperature , fishery , biology

The quantitative role of the Atlantic Meridional Overturning Circulation (AMOC) in dissolved organic carbon (DOC) export is evaluated by combining DOC measurements with observed water mass transports. In the eastern subpolar North Atlantic, both upper and lower limbs of the AMOC transport high-DOC waters. Deep water formation that connects the two limbs of the AMOC results in a high downward export of non-refractory DOC (197 Tg-C·yr −1 ). Subsequent remineralization in the lower limb of the AMOC, between subpolar and subtropical latitudes, consumes 72% of the DOC exported by the whole Atlantic Ocean. The contribution of DOC to the carbon sequestration in the North Atlantic Ocean (62 Tg-C·yr −1 ) is considerable and represents almost a third of the atmospheric CO 2 uptake in the region.

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