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Comparative Analysis of the Characteristics of rainy Season raindrop Size Distributions in Two Typical Regions of the Tibetan Plateau

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Advances in Atmospheric Sciences 2022年第7期39卷 1062-1078页

作者： Gaili WANG Ran LI Jisong SUN Xiangde XU Renran ZHOU Liping LIU State Key Laboratory of Severe Weather Chinese Academy of Meteorological ScienceBeijing 100081China

Mêdog and Nagqu are two typical regions of the Tibetan Plateau with different geographical locations and climate *** differences may lead to discrepancies in the raindrop size distributions(DSDs)and precipitation microphysical processes between the two *** paper investigates discrepancies in the DSDs using disdrometer data obtained during the rainy season in Mêdog and *** DSD characteristics are studied under five different rainfall rate categories and two precipitation types(stratiform and convective).For the total datasets,the number concentrations of drops with diameters D>0.6(Drainfall rate categories show that Nagqu has a larger(lower)mass-weighted mean diameter D_(m)(normalized intercept parameter,lgNw)than Mêdog *** difference in D_(m)between Nagqu and Mêdog increases with the rainfall *** clusters in Nagqu could be identified as continental-like,while convective precipitation in Mêdog could be classified as *** relationships between the shape factorμand slope parameterΛof the gamma distribution model,the radar reflectivity Z,and the rainfall rate R are also ***,the possible causative mechanism for the notable DSD variation between the two regions during the rainy season is illustrated using reanalysis data and automated weather station *** rain processes are mainly responsible for the lower concentrations of larger drops observed in Nagqu,whereas warm rain prevails in Mêdog,producing abundant small drops.

关键词： raindrop size distribution Tibetan Plateau continental-like maritime-like warm rain cold rain

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