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Modeling the barrier-layer formation in the South-Eastern Arabian Sea

DRS at CSIR-National Institute of Oceanography

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Title Modeling the barrier-layer formation in the South-Eastern Arabian Sea
 
Creator Durand, F.
Shankar, D.
DeBoyer Montegut, C.
Shenoi, S.S.C.
Blanke, B.
Madec, G.
 
Subject Indian Ocean
Mixed layer
Air-sea interaction
Lakshadweep Sea
ARMEX
Bay of Bengal
West India Coastal Current
Upper ocean processes
Rossby waves
 
Description The effect of salinity on the formation of the barrier layer (BL) in the South-Eastern Arabian Sea (SEAS) is investigated using an ocean general circulation model. In accordance with previous studies, the runoff distribution and the India-Sri Lanka passage have a strong impact on the realism of the salinity simulated in the area at seasonal time scales. The model simulates a BL pattern in fairly good agreement with available observations. Eulerian and Lagrangian approaches show that the BL is formed by two complementary processes, the arrival of low-salinity surface waters that are cooled en route to the SEAS and downwelling of waters mostly local to the SEAS in the subsurface layers. The surface waters are partly of Bay-of-Bengal origin and are partly from the SEAS, but are cooled east and south of Sri Lanka in the model. That the downwelled subsurface waters are warm and are not cooled leads to temperature inversions in the BL. The main forcing for this appears to be remotely-forced planetary waves.
Department of Ocean Development
Department of Science and Technology
Indo-French Programme on Weather and Climate
 
Date 2006-04-06T07:45:29Z
2006-04-06T07:45:29Z
2007
 
Type Journal Article
 
Identifier Journal of Climate, vol.20(10), 2109-2120p.
http://drs.nio.org/drs/handle/2264/43
 
Language en
 
Format 3713865 bytes
application/pdf
 
Publisher American Meteorological Society