Threshold radar reflectivity for drizzling clouds

Details Threshold radar reflectivity for drizzling clouds Threshold radar reflectivity for drizzling clouds

Feb 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3503807l&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 3, CiteID L03807

Physics

9

Atmospheric Processes: Remote Sensing, Global Change: Remote Sensing (1855), Atmospheric Processes: Clouds And Aerosols, Global Change: Atmosphere (0315, 0325), Atmospheric Composition And Structure: Cloud Physics And Chemistry

Scientific paper

Empirical studies have suggested the existence of a threshold radar reflectivity between nonprecipitating and precipitating clouds; however, there has been neither a rigorous theoretical basis for the threshold reflectivity nor a sound explanation as to why empirically determined threshold reflectivities differ among studies. Here we present a theory for the threshold reflectivity by relating it to the autoconversion process. This theory not only demonstrates the sharp transition from cloud to rain when the radar reflectivity exceeds some value (threshold reflectivity) but also reveals that the threshold reflectivity is an increasing function of the cloud droplet concentration. The dependence of threshold reflectivity on droplet concentration suggests that the differences in empirically determined threshold reflectivity arise from the differences in droplet concentration. The favorable agreement with measurements collected over a wide range of conditions further provides observational support for the theoretical formulation. The results have many potential applications, especially to remote sensing of cloud properties and studies of the second aerosol indirect effect.

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