High-resolution modeling of the Eastern Tropical Pacific oxygen minimum zone: Sensitivity to the tropical oceanic circulation.

Montes, Ivonne, Dewitte, Boris, Gutknecht, Elodie, Paulmier, Aurélien, Dadou, Isabelle, Oschlies, Andreas and Garçon, Véronique (2014) High-resolution modeling of the Eastern Tropical Pacific oxygen minimum zone: Sensitivity to the tropical oceanic circulation. Open Access Journal of Geophysical Research: Oceans, 119 (8). pp. 5515-5532. DOI 10.1002/2014JC009858.

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Abstract

The connection between the equatorial mean circulation and the oxygen minimum zone (OMZ) in the Eastern Tropical Pacific is investigated through sensitivity experiments with a high-resolution coupled physical-biogeochemical model. A validation against in situ observations indicates a realistic simulation of the vertical and horizontal oxygen distribution by the model. Two sets of climatological open-boundary conditions for the physical variables, which differ slightly with respect to the intensity and vertical structure of the Equatorial Current System, are shown to lead to contrasting characteristics of the simulated OMZ dynamics. From a Lagrangian perspective, the mean differences near the coast originate to a large extent from the different transport of deoxygenated waters by the secondary Tsuchiya Jet (secondary Southern Subsurface Countercurrent, sSSCC). The O2 budget further indicates a large difference in the balance between tendency terms, with advection exhibiting the largest difference between both simulations, which is shown to result from both linear and nonlinear advection. At regional scale, we also find that the variability of the physical contribution to the rate of O2 change is one order of magnitude larger than the variability associated with the biogeochemical contribution, which originates from internal high-frequency variability. Overall our study illustrates the large sensitivity of the OMZ dynamics to the equatorial circulation.

Document Type: Article
Additional Information: WOS:000342519500046
Keywords: OMZ; Eastern Tropical Pacific; Equatorial Current System
Research affiliation: OceanRep > SFB 754 > A2
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-BM Biogeochemical Modeling
OceanRep > SFB 754 > B1
OceanRep > The Future Ocean - Cluster of Excellence
OceanRep > SFB 754
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1002/2014JC009858
ISSN: 2169-9275
Projects: SFB754, EUR-OCEANS, Future Ocean
Date Deposited: 03 Sep 2014 09:37
Last Modified: 26 Feb 2018 12:27
URI: http://oceanrep.geomar.de/id/eprint/25545

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