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The Microphysical Characteristics of Wintertime cold clouds in North China

Advances in Atmospheric Sciences 2022年第12期39卷 2056-2070页

作者： Xuexu WU Minghuai WANG Delong ZHAO Daniel ROSENFELD Yannian ZHU Yuanmou DU Wei ZHOU Ping TIAN Jiujiang SHENG Fei WANG Deping DING School of Atmospheric Sciences Nanjing UniversityNanjing 210023China Joint International Research Laboratory of Atmospheric and Earth System Sciences&Institute for Climate and Global Change Research Nanjing UniversityNanjing 210023China Beijing Weather Modification Office Beijing 100089China Institute of Earth Sciences The Hebrew University of JerusalemJerusalem 91904Israel

The microphysical characteristics of wintertime cold clouds in North China were investigated from 22 aircraft observation flights from 2014 to 2017,2020,and *** clouds were generated by mesoscale weather systems with little orographic *** the mixed-phase temperature range(–40℃to 0℃),the average fraction of liquid,mixedphase,and ice cloud was 4.9%,23.3%,and 71.8%,respectively,and the probability distribution of ice mass fraction was a half-U-shape,suggesting that ice cloud was the primary cloud *** wintertime mixed-phase clouds in North China were characterized by large cloud droplet number concentration,small liquid water content(LWC),and small effective diameter of cloud *** main reason for larger cloud droplet number concentration and smaller effective diameter of cloud droplets was the heavy pollution in winter in North China,while for smaller LWC was the lower temperature during flights and the difference in air mass *** the temperature increasing,cloud droplet number concentration,LWC,and the size of ice particles increased,but ice number concentration and effective diameter of cloud droplets decreased,similar to other mid-latitude regions,indicating the similarity in the temperature dependence of cloud properties of mixed-phase *** variation of the cloud properties and ice habit at different temperatures indicated the operation of the aggregation and riming processes,which were commonly present in the wintertime mixed-phase *** study fills a gap in the aircraft observation of wintertime cold clouds in North China.

关键词： cold clouds aircraft observation microphysical character North China

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