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Annual and interannual variation of precipitation over the tropical Indian Ocean

DRS at CSIR-National Institute of Oceanography

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Title Annual and interannual variation of precipitation over the tropical Indian Ocean
 
Creator RameshKumar, M.R.
Prasad, T.G.
 
Subject atmospheric precipitations
rainfall
seasonal variations
annual variations
monsoons
 
Description The annual and interannual variability of precipitation over the tropical Indian Ocean is studied for the period June 1986 to December 1990 using the data retrieved from the Indian National Satellite (INSAT). The seasonal and annual rainfall over the Bay of Bengal was found to be about 2-3 times the Arabian Sea values. Harmonic analysis of the monthly mean rainfall showed that the annual wave has its largest amplitude in the northern Bay of Bengal, where the amplitude exceeds 250 mm/month, and the lowest amplitudes are found in the western Indian Ocean, especially off the Arabian and east African coasts. The INSAT and GEOS Precipitation Index (GPI) rainfall estimates correlated reasonably well with the island rainfall data, with correlation coefficients of 0.83 and 0.78, respectively, whereas the special sensor microwave imager (SSMI) rainfall estimates had the lowest correlation (r - 0.64) with the island rainfall data. A comparison of the mean annual estimates by the three methods showed that the GPI rainfall estimates were higher than the INSAT and SSMI estimates by 16% and 41%, respectively, for the Indian Ocean area. The INSAT, GPI, and SSMI rainfall estimates document significant variations (both annual and seasonal) for all the study areas, with the Indian Ocean area exhibiting area exhibiting maximum variability during the summer monsoon (June, July and August) season
 
Date 2009-01-12T11:10:07Z
2009-01-12T11:10:07Z
1997
 
Type Journal Article
 
Identifier Journal of Geophysical Research (C: Oceans), Vol.102; 18519-18527p.
http://drs.nio.org/drs/handle/2264/2100
 
Language en
 
Rights Copyright [1997]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher American Geophysical Union