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Abstract:
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Evolution of mini warm pool in the Arabian Sea just before the onset of southwest
monsoon and behavior of SST in the vicinity of weather systems formed during the
premonsoon, southwest monsoon and post monsoon seasons were studied using TMI SST
data. The Arabian Sea mini warm pool is formed about three weeks ahead of onset of
southwest monsoon. Maximum SST is found about one week ahead of monsoon onset and
then the warm pool gradually dissipated. Generally, a low-pressure system is formed when
the SST exceeds a certain threshold value for the formation of the system. Daily SST values
are examined both in Arabian sea and Bay of Bengal to bring out the quantity of increase in
SST just before the formation of the system, quantity of rapid decrease in SST during the
formation of the system and the number of days required for returning to normal SST.
Many cases were examined for pre-monsoon, southwest monsoon and post monsoon
seasons to understand the behavior of SST pattern. It is found that the SST increases about
3° C just before the formation of the system and decreases about 4° C during the formation
within 2 to 3 days and takes about 4 to 6 days to return to normal SST pattern. However,
the SST pattern depends on the weather system |