Typing Study and Fine Forecast Index of Cold Wave Weather in Xi’an Area
Based on the conventional sounding and meteorological observation data as well as numerical weather prediction product in Xi’an urban and six counties from 2001 to 2015,the spatial temporal features of cold wave weather occurred in Xi’an area are analyzed.It showed that frequency of cold wave weather declined obvious-ly since 2006,especially from 2014 to 2015 and from 2010 to 2012.As for monthly variation,cold wave appeared most in March and April.In terms of spatial distribution,cold wave weather appeared increased gradually from ur-ban to suburb.According to different moving paths of cold air,the cold wave weather in Xi’an was classified into 5 types,that is northwest road cold air,north road cold air,west road cold air,east road cold air and northwest-east road cold air.Besides,the different meteorological characteristics were comparative analyzed.Furthermore,by studying on the cold air position&temperature range,24 hours of negative temperature range and ground cold high pressure range,the altitude forecast indexes,land forecast indexes and EC numerical model prediction indexes of cold wave weather were summarized respectively.
cold wave weatherdifferent path of cold airtyping studyforecast indexXi’an area
国家科技期刊平台
NSTL
万方数据
维普
