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Theoretical and Applied Climatology

, Volume 133, Issue 3–4, pp 957–972 | Cite as

Sensitivity of convective precipitation to soil moisture and vegetation during break spell of Indian summer monsoon

  • Govindan Kutty
  • S. Sandeep
  • Vinodkumar
  • Sreejith Nhaloor
Original Paper
  • 222 Downloads

Abstract

Indian summer monsoon rainfall is characterized by large intra-seasonal fluctuations in the form of active and break spells in rainfall. This study investigates the role of soil moisture and vegetation on 30-h precipitation forecasts during the break monsoon period using Weather Research and Forecast (WRF) model. The working hypothesis is that reduced rainfall, clear skies, and wet soil condition during the break monsoon period enhance land-atmosphere coupling over central India. Sensitivity experiments are conducted with modified initial soil moisture and vegetation. The results suggest that an increase in antecedent soil moisture would lead to an increase in precipitation, in general. The precipitation over the core monsoon region has increased by enhancing forest cover in the model simulations. Parameters such as Lifting Condensation Level, Level of Free Convection, and Convective Available Potential Energy indicate favorable atmospheric conditions for convection over forests, when wet soil conditions prevail. On spatial scales, the precipitation is more sensitive to soil moisture conditions over northeastern parts of India. Strong horizontal gradient in soil moisture and orographic uplift along the upslopes of Himalaya enhanced rainfall over the east of Indian subcontinent.

Notes

Acknowledgments

The research was supported primarily by the Indian Institute of Space Science and Technology. The authors thank the Indian Institute of Tropical Meteorology, Pune for providing computational resources.

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Copyright information

© Springer-Verlag GmbH Austria 2017

Authors and Affiliations

  1. 1.Department of Earth and Space ScienceIndian Institute of Space Science and TechnologyValiamalaIndia
  2. 2.Center for Prototype Climate ModelingNew York University Abu DhabiAbu DhabiUnited Arab Emirates
  3. 3.Bureau of MeteorologyMelbourneAustralia

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