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Recent changes in the circulation parameters and their association with Indian summer monsoon rainfall

Bansod, SD and Singh, HN and Patil, SD and Singh, N (2012) Recent changes in the circulation parameters and their association with Indian summer monsoon rainfall. Journal of Atmospheric and Solar-Terrestrial Physics, 77. pp. 248-253.

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Abstract

The phenomena of Earth's climate system and its associated rainfall are mainly driven by the changes in various circulation parameters embedded with the local atmospheric instability. An attempt has been made in the present study to examine the recent changes in four selected regional circulation parameters viz., zonal wind at 200hPa level over Tibetan Anticyclone region (TA U200), zonal wind at 100hPa over peninsular India i.e. Tropical Easterly Jet (TEJ U100), meridional wind (Somali Jet) at 850hPa over Somali Coast (SJ V850) and meridional wind at 850hPa over Arabian Sea (AS V850) using NCEP/NCAR reanalysis dataset during the period 1949-2008. The influences of these circulation parameters in the Indian summer monsoon rainfall (ISMR) have also been brought out. AS V850 and TEJ U100 show decreasing tendency which in turn leads to the weakening of the moisture transport mechanism over the Indian sub-continent during the monsoon season whereas the other parameters TA U200 and SJ V850 show increasing tendency. TEJ U100 shows highly significant decreasing trends throughout the monsoon months and season with a very strong positive relationship with ISMR. The intensity of the TA U200 on monthly scale seems to have less impact as compared to the other circulation parameters on ISMR during the warming scenario though it plays a vital role in modulating the general atmospheric circulation.

Item Type: Article
Additional Information: Copyright of this article belongs to Elsevier.
Uncontrolled Keywords: 850-hPa; Arabian Sea; Atmospheric circulation; Data sets; Earth's climate; Indian summer monsoon rainfall; Meridional winds; Moisture transport; Monsoon season; Monthly scale; NCEP/NCAR; Reanalysis; Regional circulation; Tibetans; Tropical Easterly Jet; Zonal wind, Atmospheric thermodynamics; Climatology; Global warming; Wind, Rain
Subjects: Meteorology and Climatology
Depositing User: IITM Library
Date Deposited: 21 Dec 2013 06:29
Last Modified: 21 Dec 2013 06:29
URI: http://moeseprints.incois.gov.in/id/eprint/522

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