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Observed variations in air-sea exchange processes over Somali basin during monsoons 1988 and 1991

Nagar, SG and Iyer, U and Seetaramayya, P (2005) Observed variations in air-sea exchange processes over Somali basin during monsoons 1988 and 1991. Journal of Atmospheric and Ocean Science, 10 (1). pp. 43-60.

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Abstract

In the north Indian Ocean, the Somali basin off the East coast of Africa (0°-15°N and 50°E-70°E) is well known for cold eddy pools and gyres during the height of the northern summer monsoon (July-September). One such well-known cold gyre that generally encircles this region is known as the "Great Whirl". This Great Whirl is generally observed over an area 4°N-10°N, 52°E-58°E during August and September. The sea surface temperature (SST) at its centre ranges between 22 and 25°C depending upon the monsoon wind forcing. In this article, we report two case studies regarding the variability of the surface marine meteorological parameters and the surface fluxes over the Somali basin using three-hourly surface marine meteorological data collected under the Joint INDO-USSR Monsoon Experiment during August and September MONSOON-88 and MONSOON-91. The observations have shown that the centres of the Great Whirl are observed almost at the same location (i.e., 8.1°N, 56.2°E in 1988 and 8.7°N, 55.9°E in 1991) for both the years. These centres are in close agreement with Beatty et al. (BEATTY, W.H. III, BRUCE, J.G. and GUTHRIE, R.C., 1981, Circulation and oceanographic properties in the Somali basin as observed during the 1979 southwest monsoon, Report No. TR-258) and Wirth et al. (WIRTH, A., WILLEBRAND, J. and SCHOTT, F., 2002, Variability of the Great Whirl from observations and models. Deep Sea Research, 49, pp. 1279-1295.). The average winds over the Great Whirl are stronger during 1988 (210°/13ms-1) than in 1991 (230°/10ms-1). The average values of sensible heat flux at the centre of the Great Whirl are -5 and -10 Wm-2 and the corresponding values of latent heat flux are 125 and 50Wm-2 during 1988 and 1991, respectively.

Item Type: Article
Additional Information: Copyright of this article belongs to Taylor & Francis
Uncontrolled Keywords: air-sea interaction; monsoon; surface flux; warm pool, Indian Ocean; Somali Basin
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 18 Apr 2015 08:15
Last Modified: 18 Apr 2015 08:15
URI: http://moeseprints.incois.gov.in/id/eprint/1426

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