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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys. Discuss., 10, 17009-17027, 2010
© Author(s) 2010. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
09 Jul 2010
Review status
This discussion paper has been under review for the journal Atmospheric Chemistry and Physics (ACP). A final paper in ACP is not foreseen.
Suppression of warm rain by aerosols in rain-shadow areas of India
M. Konwar1, R. S. Maheskumar1, J. R. Kulkarni1, E. Freud2, B. N. Goswami1, and D. Rosenfeld2
1Indian Institute of Tropical Meteorology, Pune, 411 008, India
2The Hebrew University of Jerusalem, Jerusalem, 91904, Israel

Abstract. Aircraft observations of clouds and aerosols were conducted during the Cloud Aerosol Interaction and Precipitation Enhancement Experiment (CAIPEEX) executed by the Indian Institute of Tropical Meteorology over the Indian subcontinent during the period of May–September 2009. Existence of aerosol layer with large concentrations of cloud drop condensation nuclei extended up to heights of 4 to 5 km was observed over the rain shadow areas to the east of the Western Ghats over central India. The thick aerosol layers were observed to suppress the formation of warm rain in convective clouds up to heights of about 7 km, where mixed phase precipitation formed. This prevented clouds that did not exceed this height from precipitating significantly. This might invigorate the very deep clouds on expense of the smaller clouds. The aerosol radiative effects are suspected to decrease the surface heating and hence the available energy for propelling the convection. The net effect of the aerosols on the rainfall amounts is unknown due to the complexity of the effect, but it is suspected to be detrimental in an area where the rainfall is critical to the livelihood of the inhabitants. This requires continuation of this research.

Citation: Konwar, M., Maheskumar, R. S., Kulkarni, J. R., Freud, E., Goswami, B. N., and Rosenfeld, D.: Suppression of warm rain by aerosols in rain-shadow areas of India, Atmos. Chem. Phys. Discuss., 10, 17009-17027, doi:10.5194/acpd-10-17009-2010, 2010.
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