2008年初我国南方地区大范围冻雨过程的温度层结特征  

Temperature stratification characteristics of a wide range freezing rain event occurred over southern China in early 2008

作　　者：江杨[1] 叶金印[1] 何志新[1] 郭品文[2] 

机构地区：[1]安徽省气象台,合肥230031 [2]南京信息工程大学,南京210044

出　　处：《暴雨灾害》2017年第6期566-572,共7页Torrential Rain and Disasters

基　　金：安徽省气象局预报员专项"安徽冻雨天气在RUC模式中的预报方法研究"(KY201702);安徽省气象局面上项目"多普勒雷达资料在RUC系统中的同化应用"(KM201502)

摘　　要：利用常规气象观测资料、加密气象站观测资料与NCEP再分析资料,结合WRF中尺度模式对2008年初中国南方地区冻雨过程的数值模拟结果,对该过程冻雨发生的地面与空间温度场层结特征进行了分析。结果表明:该过程冻雨与其他降水相态的地面特征值区间存在重合,层结结构与逆温区中其他降水相态也较为相近,仅通过地面条件和有无"冷-暖-冷"层结结构来预报冻雨很可能造成较高的空报率;逆温梯度大值区(约1~2℃/层或3~5℃/km)能较好表征该过程冻雨区位置,且冻雨发生的逆温梯度值存在西高东低的差异,较大的逆温梯度是该过程中冻雨有别于其他降水相态垂直温度场的明显特征。Using conventional meteorological observation data,observations from regional automatic weather station,NCEP reanalysis data as well as the numerical simulation by the mesoscale model WRF,we have performed an analysis of the surface physical fields and the temperature vertical structures of a freezing rain event in south China in early 2008.The results indicate that in the event freezing rain corresponds well with some other precipitation types in the ranges of surface characteristic parameters,and it is somewhat similar to the other precipitation types in the temperature vertical structure of inversion area.So only by surface conditions and the presence of "cold-warm-cold" vertical structures to forecast freezing rain is it likely to result in higher false hit rate.The area of large values of inversion gradient(about 1-2 ℃/vertical coordinate layer or 3-5 ℃/km) can better characterize the freezing rain zone of this event,and the inversion gradient values are lower in the east and higher in the west when freezing rain occurred.The large inversion gradient value is a significant feature that freezing rain differs from some other precipitation types in vertical temperature fields in the event.

关 键 词：冻雨 温度层结 逆温梯度 降水相态 

分 类 号：P426.631[天文地球—大气科学及气象学]