Aircraft Measurements of the Microphysical Properties of Stratiform Clouds with Embedded Convection

查看全文 作　　者：Tuanjie [1]HOU;Hengchi [1,2]LEI;Youjiang [3]HE;Jiefan [1]YANG;Zhen [1]ZHAO;Zhaoxia [1]HU

机构地区：[1]Laboratory of Cloud-Precipitation Physics and Severe Storms,Institute of Atmospheric Physics,Chinese Academy of Sciences,Beijing 100029,China;[2]Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters,Nanjing University of Information Science and Technology,Nanjing 210044,China;[3]Institute of Atmospheric Environment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China

出　　处：《Advances in Atmospheric Sciences》索引2021年第38卷第6期,共17页

基　　金：the National Key Research and Development Program of China(Grant Nos.2019YFC1510300 and 2018YFC1507900);the National Natural Science Foundation of China(Grant Nos.41575131). 摘　　要：The presence of embedded convection in stratiform clouds strongly affects ice microphysical properties and precipitation formation.In situ aircraft measurements,including upward and downward spirals and horizontal penetrations,were performed within both embedded convective cells and stratiform regions of a mixedphase stratiform cloud system on 22 May 2017.Supercooled liquid water measurements,particle size distributions,and particle habits in different cloud regions were discussed with the intent of characterizing the riming process and determining how particle size distributions vary from convective to stratiform regions.Significant amounts of supercooled liquid water,with maxima up to 0.6 g m−3,were observed between−3℃ and−6℃ in the embedded convective cells while the peak liquid water content was generally less than 0.1 g m−3 in the stratiform regions.There are two distinct differences in particle size distributions between convective and stratiform regions.One difference is the significant shift toward larger particles from upper−15℃ to lower−10℃ in the convective region,with the maximum particle dimensions increasing from less than 6000μm to over 1 cm.The particles larger than 1 cm at−10℃ are composed of dendrites and their aggregates.The other difference is the large concentrations of small particles(25–205μm)at temperatures between−3℃ and−5℃ in the convective region,where rimed ice particles and needles coexist.Needle regions are observed from three of the five spirals,but only the cloud conditions within the convective region fit into the Hallett-Mossop criteria. 关键词：aircraft measurements liquid water content ice particle habit particle size distributions

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Aircraft Measurements of the Microphysical Properties of Stratiform Clouds with Embedded Convection

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