Effects of the Upstream Temperature Anomaly on Freezing Rain and Snowstorms over Southern China in Early 2008  

作　　者：ZUO Qunjie GAO Shouting SUN Xiaogong 左群杰;高守亭;孙效功(Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics,Chinese Academy of Sciences;State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences)

机构地区：[1]Laboratory of Cloud-Precipitation Physics and Severe Storms, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029 [2]State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081

出　　处：《Journal of Meteorological Research》2016年第5期694-705,共12页气象学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China(91437215 and 41405055);National Key Basic Research and Development(973)Program of China(2012CB417201)

摘　　要：By using ERA-Interim data, the temperature anomaly of the freezing rain and snowstorm event that occurred from Ii to 22 January 2008 in southern China was analyzed. During this period, diabatic heating and temperature advection caused the temperature to increase anomalously over the Tibetan Plateau. The anomalously high temperature moving from the Tibetan Plateau to southern Chin.a played several roles. First, the upper-level subtropical jet over China was split into two parts in the north-south direction, which affected the development of freezing rain in southern China; second, a ridge formed because of the warmer air moving to China, which hindered the transport of cold air from its upstream blocking high, forced the cold air to gather behind the ridge, and facilitated the severe cold air outbreak in the later period of the event; third, an inversion layer formed because of the lower-level cold air and upper-level warmer air over southern China, which was conducive to the development of the event over southern China; and finally, because of the temperature anomaly, opposite wind directions appeared at the lower levels （below 700 hPa）, which helped transport of warm-moist and cold-dry air to the event area.By using ERA-Interim data, the temperature anomaly of the freezing rain and snowstorm event that occurred from Ii to 22 January 2008 in southern China was analyzed. During this period, diabatic heating and temperature advection caused the temperature to increase anomalously over the Tibetan Plateau. The anomalously high temperature moving from the Tibetan Plateau to southern Chin.a played several roles. First, the upper-level subtropical jet over China was split into two parts in the north-south direction, which affected the development of freezing rain in southern China; second, a ridge formed because of the warmer air moving to China, which hindered the transport of cold air from its upstream blocking high, forced the cold air to gather behind the ridge, and facilitated the severe cold air outbreak in the later period of the event; third, an inversion layer formed because of the lower-level cold air and upper-level warmer air over southern China, which was conducive to the development of the event over southern China; and finally, because of the temperature anomaly, opposite wind directions appeared at the lower levels （below 700 hPa）, which helped transport of warm-moist and cold-dry air to the event area.

关 键 词：freezing rain upper- and lower-level jets diabatic heating Tibetan Plateau temperature ano- maly 

分 类 号：P426.6[天文地球—大气科学及气象学]