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Study of snow monsoon relationship and changes in rainfall and temperature characteristics in India

Shodhganga@INFLIBNET

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Title Study of snow monsoon relationship and changes in rainfall and temperature characteristics in India
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Contributor Parth Sarthi, P
Dash, S K
 
Subject snow monsoon
rainfall
 
Description In the recent past, there are indications of changes in the surface air temperature, extreme weather events, snow and Indian summer monsoon. This thesis analyses the above weather phenomena based on observed data and climate model simulations for the present as well as the near future. Earlier studies show a strong negative relationship between Eurasian snow cover/depth and Indian summer monsoon rainfall. Limitations of such studies are that both the parameters snow and rainfall were seasonally averaged over large areas. Indian summer monsoon has its own characteristics of evolution such as onset, active, break and withdrawal phases which have been studied extensively. However, the evolution of Eurasian snow is yet to be examined. Further, it is interesting to explore the characteristics of evolution of snow over the different regions of Eurasia and their relationship with the evolution characteristics of summer monsoon. In this thesis, a detailed examination has been done on the starting and the ending dates of snowfall over different regions of Eurasia and attempts have been made to explore any relationship with onset of Indian summer monsoon. It is observed that the regions where snowfall starts early, it ends late. Further, in those regions maximum snow depth also occurs late. In some years, more snowfall in East Eurasia is followed by less snowfall in West Eurasia. Also snow depths particularly in the northernmost and southwest regions of East Eurasia are opposite in phase. The results of this study indicate a weak relationship between snow starting dates in Eurasia and summer monsoon onset dates in the Kerala coast. However, the relationship between the northernmost Eurasian snow depth and the summer monsoon precipitation in the Peninsular India is significant. Today, regional weather/climate models are increasingly used to study several atmospheric phenomena. The Regional Climate Model, RegCM3 has been successfully integrated to simulate the salient features of Indian summer monsoon circulation and rainfall. In this thesis, multi-member simulations are performed to identify and remove the systematic errors in the model. Changes in the frequency of extreme rainfall events simulated by RegCM3 are also examined. RegCM3 has well simulated rainfall over the Central India. Dry bias is observed over Central India and wet over Northwest and Peninsular India. Shift in mean sea level pressure is observed over the foothills of the Himalayas and Tibet.
References p.181-200, Appendix p.169-179
 
Date 2013-01-09T12:38:19Z
2013-01-09T12:38:19Z
2013-01-09
n.d.
August 2011
n.d.
 
Type Ph.D.
 
Identifier http://hdl.handle.net/10603/6304
 
Language English
 
Relation -
 
Rights university
 
Format 200p.
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None
 
Coverage Environmental Science
 
Publisher New Delhi
Teri University
Centre for Energy and Environment
 
Source INFLIBNET