Retrieval of Raindrop and Cloud Particle Size Distributions with 14 GHz and 95 GHz Radars

概要

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We have developed a sequential algorithm to retrieve vertical profiles of cloud and rainfall microphysical information from radar reflectivities of a 14GHz precipitation radar, and a 95GHz cloudprofiling radar. This sequential algorithm retrieves the number density N_T, the mean volume diameter D_m and the liquid water content LWC from the nearest to the farthest ranges considering the significant attenuation and Mie scattering. To avoid the accumulation of numerical errors, the retrieval is computed in adjacent ranges assuming N_T to be constant in each pair. We demonstrate that our method retrieves N_T and D_m stably, even if the raindrop size distribution is different from our assumption, or even if some bias errors are appended to the radar constant. The method is applied to collocated ground-based observation by a 14 and a 95GHz radar, and the retrieved results are evaluated by comparing them against disdrometer-derived size distributions, where the rainfall rate was from 0.1 to 4.6mm/hr. The retrieved D_m, and the disdrometer-derived D_m, agree to within 30%. The retrieved log_<10> LWC, and the disdrometer-derived log_<10> LWC, also agree to within 30% when the rainfall rate is greater than 0.5mm/hr.
社団法人日本気象学会の論文
2005-10-25