The Indian Ocean Deep Meridional Overturning Circulation in Three Ocean Reanalysis Products

Thrivikraman Pillai, Jayasankar, Murtugudde, R. and Eldho, T.I. (2019) The Indian Ocean Deep Meridional Overturning Circulation in Three Ocean Reanalysis Products. Geophysical Research Letters, 46 (21). pp. 12146-12155. ISSN 0094-8276

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The time mean Indian Ocean (IO) deep meridional overturning circulation (MOC) is compared across three ocean reanalysis products (ORAS4, GECCO2, and GFDL). The MOC stream functions obtained by vertically integrating the mass flux across a latitude-depth section in three products are found to be significantly different from each other. Detailed analysis suggests that ORAS4 delivers the best depiction of IO MOC. The inferred IO deep MOC consists of two deep and strong counterclockwise cells located south of 30°S and around 10°S, respectively. The geostrophic component along with the barotropic or external mode dominates the former, and a combination of Ekman and geostrophic components dominates the latter. GECCO2 depicts a steady decline in the northward meridional transport in the bottom layer and a consequent reduction in the MOC strength. The tropical thermocline in GECCO2 responds to this MOC variability leading to rapid and monotonic warming of the tropical IO.

Item Type: Article
Subjects: F700 Ocean Sciences
F800 Physical and Terrestrial Geographical and Environmental Sciences
Department: Faculties > Engineering and Environment > Geography and Environmental Sciences
Depositing User: Rachel Branson
Date Deposited: 31 Aug 2021 10:08
Last Modified: 31 Aug 2021 10:15

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