AbstractThe Weather Research and Forecast (WRF) model coupled with a spectral bin microphysical (SBM) scheme is used to investigate aerosol effects on cloud microphysics and precipitation over the Indian peninsular region. The main emphasis of the study is in comparing simulated cloud microphysical structure with in situ aircraft observations from the Cloud Aerosol Interaction and Precipitation Enhancement Experiment (CAIPEEX). Aerosol-cloud interaction over the rain shadow region is investigated with observed and simulated size distribution spectra of water drops and ice particles in monsoon clouds. It is shown that size distributions as well as other microphysical characteristics obtained from simulations such as liquid water content, cloud droplet effective radius, cloud droplet number concentration and thermodynamic parameters are in good agreement with the observations. It is seen that in clouds with high CCN concentrations, snow and graupel size distribution spectra were broader, compared to clouds with low concentrations of CCN, mainly due to enhanced riming in the presence of large number of droplets with a diameter of 10 μm - 30 μm. Hallet – Mossop ice multiplication process is illustrated to have an impact on snow and graupel mass. The changes in CCN concentrations have a strong effect on cloud properties over the domain, amounts of cloud water as well as on the glaciation of the clouds, but the effects on surface precipitation are small when averaged over a large area. Overall enhancement of cold phase cloud processes in the high CCN case contributed to slight enhancement (5%) in domain averaged surface precipitation.
Journal of the Atmospheric Sciences – American Meteorological Society
Published: Jul 18, 2017
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