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Air-sea coupling during the tropical cyclones in the Indian Ocean: A case study using satellite observations

DRS at CSIR-National Institute of Oceanography

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Title Air-sea coupling during the tropical cyclones in the Indian Ocean: A case study using satellite observations
 
Creator Subrahmanyam, B.
Murty, V.S.N.
Sharp, R.J.
O'Brien, J.J.
 
Subject air-sea cupling
meteorology
hurricanes
mixed layer depth
surface salinity
remote sensing
surface temperature
mixing processes
 
Description In the years 1999 and 2001,three intense tropical cyclones formed over the northern Indian Ocean - two over the Bay of Bengal during 15 -19 and 25 -29 October, 1999 and one over the Arabian Sea during 21 -28 May, 2001. We examined the thermal, salinity and circulation responses at the sea surface due to these severe cyclones in order to understand the air-sea coupling using data from satellite measurements and model simulations. It is found that the Sea Surface Temperature (SST) cooled by about 0.5 degrees - 0.8 degrees in the Bay of Bengal and 2 degrees in the Arabian Sea. In the Bay of Bengal, this cooling took place beneath the cyclone center whereas in the Arabian Sea, the cooling occurred behind the cyclone only a few days later. This contrasting oceanic response resulted mainly from the salinity stratification in the Bay of Bengal and thermal stratification in the Arabian Sea and the associated mixing processes. In particular, the cyclones moved over the region of low salinity and smaller mixed layer depth with a distinct mixed layer deepening to the left side of the cyclone track. It is envisaged that daily satellite estimates of SST and Sea Surface Salinity (SSS)using Outgoing Longwave Radiation (OLR) and model simulated mixed layer depth would be useful for the study of tropical cyclones and prediction of their path over the northern Indian Ocean.
 
Date 2008-02-22T06:39:47Z
2008-02-22T06:39:47Z
2005
 
Type Journal Article
 
Identifier Pure and applied geophysics, Vol.132; 1643-1672p.
http://drs.nio.org/drs/handle/2264/1023
 
Language en
 
Rights Copyright [2005]. It is tried to respect the rights of the copyright holders to the best of the knowledge. If it is brought to our notice by copyright holder that the rights are voilated then the item would be withdrawn.
 
Publisher Birkhauser Verlag