Numerical Study on a Severe Downburst-Producing Thunderstorm on 23 August 2001 in Beijing  

作　　者：付丹红 郭学良 

机构地区：[1]Laboratory of Cloud-Precipitation Physics and Severe Storms （LACS）, Institute of Atmospheric Physics,Chinese Academy of Sciences, Beijing 100029 [2]Graduate University of the Chinese Academy of Sciences, Beijing 100039 [3]不详

出　　处：《Advances in Atmospheric Sciences》2007年第2期227-238,共12页大气科学进展（英文版）

基　　金：This research was jointly sponsored by the National Natural Science Foundation of China （Grant Nos. 40575003 and 40333033） ;the Chinese Academy of Sciences Innovation Foundation （Grant No. KZCX3-SW-213 and KZCX3-SW-225）.

摘　　要：A thunderstorm that produced severe wind, heavy rain and hail on 23 August 2001 in Beijing was studied by a three-dimensional cloud model including hail-bin microphysics. This model can provide important information for hail size at the surface, which is not available in hail parameterization cloud models. The results shows that the cloud model, using hail-bin microphysics, could reasonably reflect the storm＇s characteristics such as life cycle, rainfall distribution and the diameter of the hailstones and also can reproduce developing processes of downbursts, where they can then be compared with the observed features of the storm. The downburst formation mechanism was investigated based on the cloud microphysics of the simulated storm and it was found that the downburst was primarily produced by hail-loading and enhanced by cooling processes that were due to hail melting and rain evaporation. The loading and melting of hail played crucial roles in the formation of downbursts within the storm.A thunderstorm that produced severe wind, heavy rain and hail on 23 August 2001 in Beijing was studied by a three-dimensional cloud model including hail-bin microphysics. This model can provide important information for hail size at the surface, which is not available in hail parameterization cloud models. The results shows that the cloud model, using hail-bin microphysics, could reasonably reflect the storm＇s characteristics such as life cycle, rainfall distribution and the diameter of the hailstones and also can reproduce developing processes of downbursts, where they can then be compared with the observed features of the storm. The downburst formation mechanism was investigated based on the cloud microphysics of the simulated storm and it was found that the downburst was primarily produced by hail-loading and enhanced by cooling processes that were due to hail melting and rain evaporation. The loading and melting of hail played crucial roles in the formation of downbursts within the storm.

关 键 词：hail-bin microphysics severe storm DOWNBURST 

分 类 号：P427.32[天文地球—大气科学及气象学]