An accurate description of the physical characteristics of coexisting rain and snow near the freezing level is important not only to cloud and regional forecast models but also to the retrieval of precipitation from satellite passive and active microwave measurements.  The assumptions about the particle size distributions and fall speed relations used in bulk microphysics parameterizations are similar to those required to determine the absorption, scattering, and extinction coefficients within radiative transfer calculations.

This project uses data from a vertically pointing radar and a PARSIVEL disdrometer. The PARSIVEL is a ground-based instrument that is designed to simultaneously measure the fall speed and size of particles up to 24.5 mm in diameter.  A classification methodology based on particle size and fall speed properties is used to separate rain particles from snow particles to study the detailed characteristics of mixed precipitation.

Precipitation Processes

           Melting Layer and Mixed Precipitation

           Contrasts between Surface Rainfall Associated with Different Precipitation Structures

           Vertical Profile of Precipitation

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