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Thermohaline structure of an inverse estuary - The Gulf of Kachchh: Measurements and model simulations

DRS at CSIR-National Institute of Oceanography

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Title Thermohaline structure of an inverse estuary - The Gulf of Kachchh: Measurements and model simulations
 
Creator Vethamony, P.
Babu, M.T.
Ramanamurty, M.V.
Saran, A.K.
Joseph, A.
Sudheesh, K.
Patgaonkar, R.S.
Jayakumar, S.
 
Subject Arabian Sea
Thermohaline structure
 
Description The Gulf of Kachchh (GoK) is situated in the northeastern Arabian Sea. The presence of several industries along its coastal belt makes GoK a highly sensitive coastal ecosystem. In the present study, an attempt is made for the first time to study GoK thermohaline structure and its variability, based on field measurements and model simulations. Though GoK is considered as a well-mixed system, the study reveals that only the central Gulf is well mixed. Vertical gradients in temperature and salinity fields are noticed in the eastern Gulf, where a cold and high saline tongue is observed in the subsurface layers. Salinity indicates the characteristic feature of an inverse estuary with low values (37.20 psu) near the mouth and high values (40.0 psu) near the head of the Gulf. The model simulated temperature and salinity fields exhibit semidiurnal oscillations similar to that of field observations. Model results show warm, less saline waters advecting from the east during ebb forming a transition zone, which oscillates with tides. A high salinity tongue is seen in the bottom layer, indicating a westward flowing bottom current. The transient zone acts as an dynamic barrier, and plays a vital role in the pollutant transport.
 
Date 2007-06-20T02:49:15Z
2007-06-20T02:49:15Z
2007
 
Type Journal Article
 
Identifier Marine Pollution Bulletin, Vol. 54(6), 697-707pp.
http://drs.nio.org/drs/handle/2264/620
 
Language en
 
Rights An edited version of this is published by Elsevier. Copyright Elsevier[2007]
 
Format 2305072 bytes
application/pdf
 
Publisher Elsevier