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Spectral dispersion of cloud droplet size distributions and radar threshold reflectivity for drizzle

Keywords: radar threshold reflectivity,spectral dispersion,cloud droplet number concentration

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From first principles, we find that the radar threshold reflectivity between nonprecipitating clouds and precipitating clouds is strongly related to not only the cloud droplet number concentration but also the spectral dispersion of cloud droplet size distributions. The further investigation indicates that the threshold value is an increasing function of spectral dispersion and cloud droplet number concentration. These results may improve our understanding of the cloud-precipitation interaction and the aerosol indirect effect.


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