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On the diurnal ranges of sea surface temperature (SST) in the north Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title On the diurnal ranges of sea surface temperature (SST) in the north Indian Ocean
 
Creator Shenoi, S.S.C.
Nasnodkar, N.
Rajesh, G.
Joseph, K.J.
Suresh, I.
Almeida, A.M.
 
Subject sea surface temperature
Indian Ocean
diurnal range
monsoon
 
Description This paper describes the variability in the diurnal range of SST in the north Indian Ocean using in situ measurements and tests the suitability of simple regression models in estimating the diurnal range. SST measurements obtained from 1556 drifting and 25 moored buoys were used to determine the diurnal range of SSTs. The magnitude of diurnal range of SST was highest in spring and lowest in summer monsoon. Except in spring, nearly 75-80 % of the observations reported diurnal range below 0.5 degrees C. The distributions of the magnitudes of diurnal warming across the three basins of north Indian Ocean (Arabian Sea, Bay of Bengal and Equatorial Indian Ocean) were similar except for the differences between the Arabian Sea and the other two basins during November-February (winter monsoon) and May. The magnitude of diurnal warming that depended on the location of temperature sensor below the water level varied with seasons. In spring, the magnitude of diurnal warming diminished drastically with the increase in the depth of temperature sensor. The diurnal range estimated using the drifting buoy data was higher than the diurnal range estimated using moored buoys fitted with temperature sensors at greater depths. A simple regression model based on the peak solar radiation and average wind speed was good enough to estimate the diurnal range of SST at approx. 1.0 m in the north Indian Ocean during most of the seasons except under low wind-high solar radiation conditions that occur mostly during spring. The additional information on the rate of precipitation is found to be redundant for the estimation of the magnitude of diurnal warming at those depths.
 
Date 2009-11-10T11:29:14Z
2009-11-10T11:29:14Z
2009
 
Type Journal Article
 
Identifier Journal of Earth System Science, vol.118(5); 483-496
http://drs.nio.org/drs/handle/2264/3432
 
Language en
 
Publisher Indian Academy of Sciences