Ice Nucleation of Cirrus Clouds Related to the Transported Dust Layer Observed by Ground-Based Lidars over Wuhan,China  

作　　者：Yun HE Fan YI Fuchao LIU Zhenping YIN Jun ZHOU 

机构地区：[1]School of Electronic Information,Wuhan University,Wuhan 430072,China [2]Key Laboratory of Geospace Environment and Geodesy,Ministry of Education,Wuhan 430072,China [3]State Observatory for Atmospheric Remote Sensing,Wuhan 430072,China [4]School of Remote Sensing and Information Engineering,Wuhan University,Wuhan 430072,China

出　　处：《Advances in Atmospheric Sciences》2022年第12期2071-2086,共16页大气科学进展（英文版）

基　　金：funded by the National Natural Science Foundation of China (Grant Nos. 42005101 and 41927804);Hubei Provincial Natural Science Foundation of China (Grant No. 2020CFB229);the Fundamental Research Funds for the Central Universities Grant (Grant Nos. 2042020kf0018 and 2042021kf1066);The Meridian Space Weather Monitoring Project (China) also provides financial support for lidar maintenance

摘　　要：Cirrus clouds related to transported dust layers were identified on 22 occasions with ground-based polarization lidar from December 2012 to February 2018 over Wuhan(30.5°N,114.4°E),China.All the events occurred in spring and winter.Cirrus clouds were mostly located above 7.6 km on top of the aloft dust layers.In-cloud relative humidity with respect to ice(RH_(i))derived from water vapor Raman lidar as well as from ERA5 reanalysis data were used as criteria to determine the possible ice nucleation regimes.Corresponding to the two typical cases shown,the observed events can be classified into two categories:(1)category A(3 cases),in-cloud peak RH_(i)≥150%,indicating competition between heterogeneous nucleation and homogeneous nucleation;and(2)category B(19 cases),in-cloud peak RH_(i)<150%,revealing that only heterogeneous nucleation was involved.Heterogeneous nucleation generally took place during instances of cirrus cloud formation in the upper troposphere when advected dust particles were present.Although accompanying cloud-top temperatures ranged from–51.9℃to–30.4℃,dust-related heterogeneous nucleation contributed to primary ice nucleation in cirrus clouds by providing ice nucleating particle concentrations on the order of 10^(−3)L^(−1)to 10^(2)L^(−1).Heterogeneous nucleation and subsequent crystal growth reduced the ambient RH_(i)to be less than 150%by consuming water vapor and thus completely inhibited homogeneous nucleation.

关 键 词：CIRRUS ice nucleation polarization lidar dust ice-nucleating particle 

分 类 号：P407[天文地球—大气科学及气象学]