Variability of the Great Whirl from Observations and Models

Wirth, A., Willebrand, Jürgen and Schott, Friedrich (2002) Variability of the Great Whirl from Observations and Models Deep-Sea Research Part II-Topical Studies in Oceanography, 49 (7). pp. 1279-1295. DOI 10.1016/S0967-0645(01)00165-5.

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Abstract

Observations from cruises in the Arabian Sea and data from satellites are interpreted using different realizations of a multi-level primitive equation model and an eddy-permitting reduced-gravity shallow water model of the Indian Ocean. The focus is on the interannual circulation variability of the Arabian Sea, and especially of the meridional location of the Great Whirl (GW). The results suggest that the variability in the western Arabian Sea is not only due to the interannual variability in the wind field, but that a substantial part is caused by the chaotic nature of the ocean dynamics. Decreasing the friction coefficient from 1000 to 500m2s-1 in a 19o numerical reduced-gravity model, the variance of the GW location increases dramatically, and the mean position moves southward by one degree. In the eddy-permitting experiments analyzed, both mechanisms appear to determine the GW location at the onset of the GW dynamics in late summer.

Document Type: Article
Keywords: Physical Oceanography; Oceanography; SOMALI CURRENT; INTERANNUAL VARIABILITY; MONSOON RESPONSE; SUMMER MONSOON; SYSTEM
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-TM Theory and Modeling
OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-PO Physical Oceanography
OceanRep > Institute for Marine Science Kiel
Refereed: Yes
DOI etc.: 10.1016/S0967-0645(01)00165-5
ISSN: 0967-0645
Projects: WOCE
Date Deposited: 18 Feb 2008 17:25
Last Modified: 12 Oct 2016 09:25
URI: http://eprints.uni-kiel.de/id/eprint/8286

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