P1.30

**A technique for computing hydrometeor effective radius in bins of a gamma distribution**

**Lewis Grasso**, CIRA/Colorado State Univ., Fort Collins, CO; and M. Sengupta and D. T. Lindsey

As part of the Geostationary Operational Environmental Satellite R (GOES-R) and National Polar-Orbiting Operational Environmental Satellite System Preparatory Project (NPP) risk reduction activities at the Cooperative Institute for Research in the Atmosphere (CIRA), we have proposed to create synthetic imagery in advance of the launch of an instrument. To produce synthetic imagery in ice clouds, scattering of solar radiation in ice crystals has to be accounted for while computing brightness temperatures. Scattering and absorption properties of inhomogenous ice crystals can be computed using anomalous diffraction theory. Also geometric ray tracing methods can be used to compute the same optical properties. This paper discusses the results arising from using different computation methods as well as the impact of different averaging methods to account for crystal size distributions. For example, computing the effective radius within bins of a gamma distribution of particle sizes.

Poster Session 1, Retrievals and Cloud Products

**Monday, 30 January 2006, 2:30 PM-2:30 PM**, Exhibit Hall A2** Previous paper Next paper
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