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Effect of Tibetan snow on Indian Summer monsoon rainfall using RegCM2.5

Effect of Tibetan snow on Indian Summer monsoon rainfall using RegCM2.5. M. S. Shekhar & S. K. Dash Indian Institute of Technology Delhi Hauz Khas, New Delhi -110016 India. Workshop on Theory and use of Regional Climate Model (RegCM3). Introduction.

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Effect of Tibetan snow on Indian Summer monsoon rainfall using RegCM2.5

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  1. Effect of Tibetan snow on Indian Summer monsoon rainfall using RegCM2.5 M. S. Shekhar & S. K. Dash Indian Institute of Technology Delhi Hauz Khas, New Delhi -110016 India Workshop on Theory and use of Regional Climate Model (RegCM3)

  2. Introduction  The summer monsoon of southwest Asia is the largest anomaly of general circulation.  Interannual variations of summer monsoon rainfall affects agriculture, water resources and the economy of the country.  The slowly varying boundary conditions at the surface of earth provides required memory in the climate system to predict averaged monsoon circulation and rainfall.  There exist an inverse relationship between Indian summer monsoon rainfall and the extent of Eurasian snow cover in the preceding season.

  3. Objectives  To simulate Indian summer monsoon circulation features and Rainfall over the Indian region using RegCM2.5.  To conduct sensitivity experiments by using snow depth over Tibet to study its effect on Indian summer monsoon rainfall.

  4. Domain Information Central Latitude- 20oN Central Longitude- 80oE 115 Points along the longitudinal direction 101 Points along the latitudinal direction 55oE to 105oE and 5oS to 45oN Grid distance- 110 Km Mercator Projection Data used PSU/NCAR global 30’ resolution terrain and landuse data. Monthly OI SST available from NCEP ECMWF TOGA/WCRP uninitialized data 4 times daily

  5. Subdivisional Rainfall over India- 1994

  6. Subdivisional Rainfall over India- 1995

  7. All India Rainfall-1994 All India Rainfall-1995

  8. Conclusions The Regional Climate Model (RegCM3) is able to simulate the monsoon circulation over India reasonably well. The rainfall simulated in mm/day in Grell convection scheme is closer to the observed rainfall of the India Meteorological Department compared to the Kuo. The inverse snow-ISMR relationship is confirmed by using snow depth as the boundary condition in RegCM3. The All India rainfall is reduced by almost 20-25% in the high Tibetan snow experiment than in the control experiment.

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