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Controlling Factors of the Omz in the Arabian Sea : Volume 9, Issue 5 (10/05/2012)

By Resplandy, L.

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Book Id: WPLBN0003983762
Format Type: PDF Article :
File Size: Pages 42
Reproduction Date: 2015

Title: Controlling Factors of the Omz in the Arabian Sea : Volume 9, Issue 5 (10/05/2012)  
Author: Resplandy, L.
Volume: Vol. 9, Issue 5
Language: English
Subject: Science, Biogeosciences, Discussions
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Lévy, M., Bopp, L., Echevin, V., S. S. Sarm, V. V., Kumar, D., Resplandy, L., & Pous, S. (2012). Controlling Factors of the Omz in the Arabian Sea : Volume 9, Issue 5 (10/05/2012). Retrieved from

Description: Laboratoire des Sciences du Climat et de l'Environnement (LSCE), (CEA, CNRS, UMR8212, UVSQ), IPSL, France. In-situ observations indicate that the Arabian Sea oxygen minimum zone (OMZ) is only weakly influenced by the strong seasonal cycle of ocean dynamic and biogeochemistry forced by the asian monsoon system and it is spatially decorrelated from the coastal upwelling systems where the biological production is the strongest. In this study we examine the factors controlling the seasonality and the spatial distribution of the OMZ in the Arabian Sea using a coupled bio-physical model. We find that the oxygen concentration in the OMZ displays a seasonal cycle with an amplitude of 5–15 % of the annual mean oxygen concentration. The OMZ is ventilated by lateral ventilation along the western boundary current and in the coastal undercurrent along India during the summer monsoon and by coastal downwelling and negative Ekman pumping during the fall intermonsoon and winter monsoon. This ventilation is counterbalanced by strong coastal upwelling and positive Ekman pumping of low oxygen waters at the base of the OMZ during the spring intermonsoon. Although the factors controlling the OMZ seasonality are associated with the men circulation, we find that mesoscale dynamics modulates them by limiting the vertical ventilation during winter and enhancing it through lateral advection during the rest of the year. Processes explaining the establishment and spatial distribution of the OMZ were quantified using a perturbation experiment initialised with no OMZ. As expected, the oxygen depletion is triggered by strong biological activity in central Arabian Sea during winter and in western and eastern boundary coastal upwelling systems during summer. We find that the 3-D ocean dynamic largely controls the spatial distribution of the OMZ. The eastward shift ensues from the northward lateral transport of ventilated waters along the western and eastern coasts and the advection offshore of low oxygen waters formed in the upwelling system.

Controlling factors of the OMZ in the Arabian Sea

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