Origin of intraseasonal variability of circulation in the tropical central Indian Ocean

Sengupta, Debasis and Senan, Retish and Goswami, BN (2001) Origin of intraseasonal variability of circulation in the tropical central Indian Ocean. In: Geophysical Research Letters, 28 (7). pp. 1267-1270.

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Abstract

Observed upper ocean currents south of Sri Lanka exhibit large, irregular fluctuations with periods of days to weeks.An ocean model driven by daily surface winds is able to reproduce the observed fluctuations. We find from model experiments that low frequency (30-50 day) intraseasonal variability (ISV) arises when Rossby waves radiated from the eastern boundary are amplified by hydrodynamic instability in the eastern and central Indian Ocean. High frequency (10-15 day) ISV is forced directly by ISV of the wind field in the eastern Indian Ocean. In spite of the contribution from instability, the ocean circulation south of Sri Lanka is a deterministic response to wind forcing.

Item Type:	Journal Article
Publication:	Geophysical Research Letters
Publisher:	American Geophysical Union
Additional Information:	Copyright of this article belongs to American Geophysical Union.
Department/Centre:	Division of Mechanical Sciences > Centre for Atmospheric & Oceanic Sciences
Date Deposited:	09 Sep 2004
Last Modified:	19 Sep 2010 04:16
URI:	http://eprints.iisc.ac.in/id/eprint/1942

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