Frontal genesis of moisture atmosphere during the early 2008 persistent freezing-rain event in southern China  

作　　者：QIAN WeiHong1 & FU JiaoLan1,2 1 Department of Atmospheric Sciences, School of Physics, Peking University, Beijing 100871, China 2 National Meteorological Center of CMA, Beijing, 100081, China 

出　　处：《Science China Earth Sciences》2010年第3期454-464,共11页中国科学（地球科学英文版）

基　　金：supported by National Basic Research Program of China (Grant No. 2006CB403602);National Natural Science Foundation of China (Grant No. 40975039)

摘　　要：From January 10 to February 2, 2008, a severe and persistent freezing-rain event occurred in southern and southwestern China. Here we use an observational analysis to compare the persistent freezing-rain event in the early 2008 with the winter precipita- tion in the late 2007 over south of the Yangtze River (Jiangnan). The persistent freezing-rain event was directly linked to the activity of quasi-stationary front. The gradient of equivalent temperature (ET) can well indicate the frontal genesis of moist atmosphere (moisture front) and its activity as well as its relationship with precipitation belt. The precipitation types (snow and freezing rains) are related to the vertical structure of moisture front. The inversion profile of ET vertical distribution is a typical synoptic condition that caused the freezing-rain event. The horizontal gradient of ET with a criterion of 10℃ / 100 km, which reflects the accumulation and release of atmospheric energy, can be applied to predict the precipitation 5-10 days in advance.From January 10 to February 2, 2008, a severe and persistent freezing-rain event occurred in southern and southwestern China. Here we use an observational analysis to compare the persistent freezing-rain event in the early 2008 with the winter precipita- tion in the late 2007 over south of the Yangtze River (Jiangnan). The persistent freezing-rain event was directly linked to the activity of quasi-stationary front. The gradient of equivalent temperature (ET) can well indicate the frontal genesis of moist atmosphere (moisture front) and its activity as well as its relationship with precipitation belt. The precipitation types (snow and freezing rains) are related to the vertical structure of moisture front. The inversion profile of ET vertical distribution is a typical synoptic condition that caused the freezing-rain event. The horizontal gradient of ET with a criterion of 10℃ / 100 km, which reflects the accumulation and release of atmospheric energy, can be applied to predict the precipitation 5-10 days in advance.

关 键 词：freezing-rain EVENT FRONTAL GENESIS extended-range weather forecast winter Jiangnan 

分 类 号：P426.322[天文地球—大气科学及气象学]