Relationships between the global general circulation and the indian summer monsoon |
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| Authors: | M Sankar–Rao V N Lykossov E M Volodin A E Nikitin A I Degtiarev Kusuma G Rao |
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| Institution: | Department of Aerospace Engineering and Centre for Atmospheric Sciences, Indian Institute of Science, Bangalore 560012, INDIA,Department of Numerical Mathematics, USSR Academy of Sciences, Moscow, USSR,Department of Numerical Mathematics, USSR Academy of Sciences, Moscow, USSR,Hydrometeorological Centre, Moscow, USSR,Hydrometeorological Centre, Moscow, USSR,Centre for Atmospheric Sciences, Indian Institute of Science, Bangalore 560012, INDIA |
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| Abstract: | The relationships between the global general circulation and the Indian monsoon during active and break phases are investigated with the help of FGGE IIIb data.It was found that the ultralong wave component positive and negative height anomalies over Tibet are associated with active and break monsoon phases respectively. This ultralong wave component has significant effect even upto 22oN over the Indian region which is the monsoon trough region. During a monsoon break, the general circulation was found to be more turbulent in the sense that more waves become energised.It was observed that during a break, blocking prevails over the Siberian region and cold air advection takes place toward Indian region from Siberian region depressing the temperatures over the Indian region by about 1oC. During the break, the Indian region gets connected with higher latitudes by the south winds blowing from polar Soviet re-gions to the Indian region. From active to break phase the zonal component weakens by about 25% from Indian ocean area right upto Alaskan region, along the east coast of Asia. |
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