Analysis of the Structure and Propagation of a Simulated Squall Line on 14 June 2009  

作　　者：LIU Lu RAN Lingkun SUN Xiaogong 

机构地区：[1]Institute of Atmosphere Physics, Chinese Academy Sciences [2]Graduate University of Chinese Academy of Sciences [3]Chinese Academy of Meteorological Sciences

出　　处：《Advances in Atmospheric Sciences》2015年第8期1049-1062,共14页大气科学进展（英文版）

基　　金：supported by the National Basic Research Program of China (Grant No. 2013CB 430105);the Key Program of the Chinese Academy of Sciences (Grant No. KZZD-EW-05);the project of CAMS (Chinese Academy of Meteorological Sciences) (Grant No. 2011LASWB15);the National Natural Sciences Foundation of China (Grant No. 41175060)

摘　　要：A squall line on 14 June 2009 in the provinces of Jiangsu and Anhui was well simulated using the Advanced Regional Prediction System （ARPS） model. Based on high resolution spatial and temporal data, a detailed analysis of the structural features and propagation mechanisms of the squall line was conducted. The dynamic and thermodynamic structural charac- teristics and their causes were analyzed in detail. Unbalanced flows were found to play a key role in initiating gravity waves during the squall line＇s development. The spread and development of the gravity waves were sustained by convection in the wave-CISK process. The squall line＇s propagation and development mainly relied on the combined effect of gravity waves at the midlevel and cold outflow along the gust front. New cells were continuously forced by the cold pool outflow and were enhanced and lifted by the intense upward motion. At a particular phase, the new cells merged with the updraft of the gravity waves, leading to an intense updraft that strengthened the squall line.A squall line on 14 June 2009 in the provinces of Jiangsu and Anhui was well simulated using the Advanced Regional Prediction System （ARPS） model. Based on high resolution spatial and temporal data, a detailed analysis of the structural features and propagation mechanisms of the squall line was conducted. The dynamic and thermodynamic structural charac- teristics and their causes were analyzed in detail. Unbalanced flows were found to play a key role in initiating gravity waves during the squall line＇s development. The spread and development of the gravity waves were sustained by convection in the wave-CISK process. The squall line＇s propagation and development mainly relied on the combined effect of gravity waves at the midlevel and cold outflow along the gust front. New cells were continuously forced by the cold pool outflow and were enhanced and lifted by the intense upward motion. At a particular phase, the new cells merged with the updraft of the gravity waves, leading to an intense updraft that strengthened the squall line.

关 键 词：squall line structural feature gravity wave cold pool outflow 

分 类 号：P458.2[天文地球—大气科学及气象学]