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Title: Study of snow monsoon relationship and changes in rainfall and temperature characteristics in India
Researcher: Ashu Mamgain
Guide(s): Parth Sarthi, P
Dash, S K
Keywords: snow monsoon
Upload Date: 9-Jan-2013
University: Teri University
Completed Date: August 2011
Abstract: 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.
Pagination: 200p.
Appears in Departments:Centre for Energy and Environment

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01_title.pdfAttached File78.43 kBAdobe PDFView/Open
02_declaration.pdf62.39 kBAdobe PDFView/Open
03_certificate.pdf64.67 kBAdobe PDFView/Open
04_research comittee.pdf63.19 kBAdobe PDFView/Open
05_acknowledgements.pdf59.22 kBAdobe PDFView/Open
06_table of contents.pdf121.01 kBAdobe PDFView/Open
07_list of tables.pdf114.77 kBAdobe PDFView/Open
08_list of figures.pdf212.03 kBAdobe PDFView/Open
09_acronyms.pdf91.56 kBAdobe PDFView/Open
10_abbreviations.pdf141.33 kBAdobe PDFView/Open
11_abstract.pdf79.05 kBAdobe PDFView/Open
12_chapter 1.pdf227.67 kBAdobe PDFView/Open
13_chapter 2.pdf1.52 MBAdobe PDFView/Open
14_chapter 3.pdf4.99 MBAdobe PDFView/Open
15_chapter 4.pdf3.15 MBAdobe PDFView/Open
16_chapter 5.pdf1.67 MBAdobe PDFView/Open
17_chapter 6.pdf104.52 kBAdobe PDFView/Open
18_appendix.pdf303.1 kBAdobe PDFView/Open
19_references.pdf269.64 kBAdobe PDFView/Open

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