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Variability of coastal ocean processes along the west coast of India

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Title Variability of coastal ocean processes along the west coast of India
 
Creator Rao, A. D.
 
Subject Arabian Sea
Coastal circulation
Numerical modeling
Tropical cyclone
Subsurface warming
 
Description 475-484
Three-dimensional
Princeton Ocean Model (POM) is used to understand coastal ocean processes and
its variability along the west coast of India. An attempt is first made to
understand variability of the surface circulation and associated SST during
July-August 2000 and 2002 as a response of daily wind stress forcing derived
from the QSCAT winds. The coastal current reverses its direction to either
off-shore or northward if the wind reduces its strength suddenly to less than 3
ms-1 towards the coast. In this event, the coastal upwelling is
inhibited by the reversal of near shore currents and results in an increase in
the local SST. This feature is also noticed in the buoy data available for
2002. Another experiment is made to understand the dynamics in relation to the
fact of observed low-salinity plume off Gulf of Khambhat during post-monsoon
season. It is found that the freshwater discharge to the gulf from the
adjoining rivers during monsoon season is trapped in the region as the currents
are onshore. As the currents change its direction to offshore after withdrawal
of the monsoon, the confined low-salinity waters are being released to the open
ocean. Lastly, the study is made to understand the response of the ocean to
tropical cyclones in the Arabian Sea (AS). The study focuses on surface cooling
and temperature rise in the sub-surface waters and explained its mechanism
through upwelling and downwelling processes respectively. Local stratification
of the vertical temperature plays an important role for the cooling of the
surface waters and warming in the sub-surface depths. The analysis of the model
simulations and observations suggest that the extent of sub-surface warming is
directly related to the depth of the thermocline region.
 
Date 2011-01-04T08:49:36Z
2011-01-04T08:49:36Z
2010-12
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/10792
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.39(4) [December 2010]