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On the role of the cross equatorial flow on summer monsoon rainfall over India using NCEP/NCAR reanalysis data

DRS at CSIR-National Institute of Oceanography

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Title On the role of the cross equatorial flow on summer monsoon rainfall over India using NCEP/NCAR reanalysis data
 
Creator RameshKumar, M.R.
Shenoi, S.S.C.
Schluessel, P.
 
Subject summer
monsoons
wind data
wind speed
moisture transfer
satellites
 
Description The role of the cross equatorial flow from the southern Indian Ocean on the Indian Summer monsoon is examined using the National Centre for Environmental Prediction (NCEP)/National Centre for Atmospheric Research (NCAR) data for the period January 1982 to December 1994. A comparison of NCEP/NCAR data with the satellite data retrieved from the Special Sensor Microwave Imager (SSM/I) sensor onboard the Defense Meteorological Satellite Program (DMSP) exhibited a negative bias for the wind speeds greater than 4 m/s whereas in the case of specific humidity. SSMI values exhibited a positive bias and the precipitable water derived from the satellite data exhibited a negative bias. The NCEP reanalysis is able to depict the mean annual cycle of both the cross equatorial flow and moisture flow into the Indian subcontinent during the monsoon season, but it fails to depict these differences during excess (1983, 1988, 1994) and deficit monsoon (1982, 1986, 1987) composites. Further, it is seen that inter hemispheric flow far exceeds the excess moisture available over the Arabian Sea indicating that it is the cross equatorial flow which decides the fate of the Indian summer monsoon
 
Date 2009-01-10T11:33:47Z
2009-01-10T11:33:47Z
1999
 
Type Journal Article
 
Identifier Meteorology and Atmospheric Physics, Vol.70; 201-213p.
http://drs.nio.org/drs/handle/2264/1816
 
Language en
 
Rights Copyright [1999]. 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 Springer