Seasonal variability of the temperature field off the south-west coast of India |
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| Authors: | Satish R Shetye |
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| Institution: | (1) Physical Oceanography Division, National Institute of Oceanography, Dona Paula, 403 004 Goa, India |
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| Abstract: | The temperature field in the coastal region off south-west India exhibits a wellmarked annual cycle. Around March the isotherms
develop an upward tilt near the coast. The magnitude of the tilt increases continuously till August, then decreases and vanishes
in November. To check the hypothesis that this feature is in response to the local wind, we have used the resultant wind data
to determine the annual march of the wind stress. It is found that though weak during November–March, the monthly-mean longshore
component of the wind stress is always conducive to coastal upwelling and follows a pattern similar to that of the isotherm
tilt. We interpret this result to indicate that coastal processes in the area during April–October are controlled by the longshore
component of the local wind stress in accordance with the classical model for a coastal upwelling system. During November–March,
when the wind stress is weak, it appears that the influence of the longshore density gradient, which persists at the surface
during this period, dominates over the effect of the wind. |
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| Keywords: | Temperature field Indian coastal region wind stress coastal upwelling Ekman-Thorade model wind-forcing thermohaline forcing advective field |
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