Major role of the equatorial current system in setting oxygen levels in the eastern tropical Atlantic Ocean: a high-resolution model study.

Duteil, Olaf , Schwarzkopf, Franziska U. , Böning, Claus W. and Oschlies, Andreas (2014) Major role of the equatorial current system in setting oxygen levels in the eastern tropical Atlantic Ocean: a high-resolution model study. Open Access Geophysical Research Letters, 41 . pp. 2033-2040. DOI 10.1002/2013GL058888.

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Abstract

Understanding the causes of the observed expansion of tropical ocean's oxygen minimum zones (OMZs) is hampered by large biases in the representation of oxygen distribution in climate models, pointing to incorrectly represented mechanisms. Here we assess the oxygen budget in a global biogeochemical circulation model, focusing on the Atlantic Ocean. While a coarse (0.5°) configuration displays the common bias of too large and too intense OMZs, the oxygen concentration in an eddying (0.1°) configuration is higher and closer to observations. This improvement is traced to a stronger oxygen supply by a more realistic representation of the equatorial and off-equatorial undercurrents, outweighing the concurrent increase in oxygen consumption associated with the stronger nutrient supply. The sensitivity of the eastern tropical Atlantic oxygen budget to the equatorial current intensity suggests that temporal changes in the eastward oxygen transport from the well-oxygenated western boundary region might partly explain variations in the OMZs.

Document Type: Article
Additional Information: WOS:000334264900030
Keywords: oxygen minimum zone; tropical Atlantic ocean; equatorial current system; high resolution modeling; biogeochemical modeling
Research affiliation: OceanRep > SFB 754 > A2
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
OceanRep > SFB 754
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2013GL058888
ISSN: 0094-8276
Projects: SFB754
Expeditions/Models/Experiments:
Date Deposited: 23 Jan 2014 09:08
Last Modified: 10 Apr 2017 08:40
URI: http://oceanrep.geomar.de/id/eprint/23188

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