Cirrus cloud microphysical property retrieval using lidar and radar measurements. Part I: Algorithm description and comparison with in situ data

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Abstract

A retrieval algorithm is described to estimate vertical profiles of cirrus-cloud ice water content (IWC) and general effective size Dge from combined lidar and radar measurements. In the algorithm, the lidar extinction coefficient σ is parameterized as σ = IWC[ao + (a1IDge)] and water equivalent radar reflectivity factor Ze is parameterized as Ze = C' (IWC/p1)Dbge where ao, a1, C1, and b are constants based on the assumption of a modified gamma size distribution and hexagonal ice crystals. A comparison of retrieved results from a cirrus-cloud case study with aircraft in situ measurements indicates that the algorithm can provide reliable cirrus cloud microphysical properties. A technique to estimate ice water path and layer-mean Dge is also developed using the optical depth and mean radar reflectivity factor of the cloud layer.

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Wang, Z., & Sassen, K. (2002). Cirrus cloud microphysical property retrieval using lidar and radar measurements. Part I: Algorithm description and comparison with in situ data. Journal of Applied Meteorology, 41(3), 218–229. https://doi.org/10.1175/1520-0450(2002)041<0218:CCMPRU>2.0.CO;2

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