Shallow overturning circulation of the Western Indian Ocean.

Schott, Friedrich (2005) Shallow overturning circulation of the Western Indian Ocean. Philosophical Transactions of The Royal Society A: Mathematical Physical and Engineering Sciences, 363 (1826). pp. 143-149. DOI 10.1098/rsta.2004.1483.

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Abstract

The Indian Ocean differs from the other two oceans in not possessing an eastern equatorial upwelling regime. Instead, the upwelling occurs dominantly in the northwestern Arabian Sea and, to a lesser degree, around the Indian subcontinent. Subduction, on the other hand, occurs dominantly in the Southern Hemisphere. The result is a shallow Cross–Equatorial Cell connecting both regimes. The northward flow at thermocline levels occurs as part of the Somali Current and the southward upper–layer return flow is carried by the Ekman transports that are directed southward in both hemispheres. The main forcing is by the Southwest Monsoon that overwhelms the effects of the Northeast Monsoon and is the cause for the annual mean Northern Hemisphere upwelling and southward Ekman transports. In the Southern Hemisphere, the annual mean upwelling at the northern rim of the Southeast Trades causes a zonally extended open–ocean upwelling regime that is apparent in isopycnal doming in the 3–12○ S band; it drives a shallow Subtropical Cell.

Document Type: Article
Keywords: ocean circulation, cross-equatorial flow, meridional overturning, Indian Ocean
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
Refereed: Yes
Open Access Journal?: No
DOI etc.: 10.1098/rsta.2004.1483
ISSN: 0080-4614
Date Deposited: 03 Dec 2008 16:50
Last Modified: 08 Aug 2019 11:58
URI: http://oceanrep.geomar.de/id/eprint/4028

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