The warm pool in the Indian Ocean |
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| Authors: | P N Vinayachandran S R Shetye |
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| Institution: | (1) National Institute of Oceanography, 403 004 Dona Paula, Goa, India;(2) Centre for Atmospheric Sciences, Indian Institute of Science, 560 012 Bangalore, India |
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| Abstract: | The structure of the warm pool (region with temperature greater than 28°C) in the equatorial Indian Ocean is examined and
compared with its counterpart in the Pacific Ocean using the climatology of Levitus. Though the Pacific warm pool is larger
and warmer, a peculiarity of the pool in the Indian Ocean is its seasonal variation. The surface area of the pool changes
from 24 × 106 km2 in April to 8 × 106 km2 in September due to interaction with the southwest monsoon. The annual cycles of sea surface temperature at locations covered
by the pool during at least a part of the year show the following modes: (i) a cycle with no significant variation (observed
in the western equatorial Pacific and central and eastern equatorial Indian Ocean), (ii) a single maximum/minimum (northern
and southern part of the Pacific warm pool and the south Indian Ocean), (iii) two maxima/minima (Arabian Sea, western equatorial
Indian Ocean and southern Bay of Bengal), and (iv) a rapid rise, a steady phase and a rapid fall (northern Bay of Bengal). |
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| Keywords: | Warm pool equatorial Pacific Ocean equatorial Indian Ocean sea surface temperature annual cycle |
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