阿勒泰地区夏季短时强降水对流参数特征  

Convective Parameter Characteristics of Short-term Heavy Rainfall in Altay Region in Summer

作　　者：李新豫[1] 李博渊[1] 庄晓翠[1] LI Xinyu;LI Boyuan;ZHUANG Xiaocui(Altay Meteorological Bureau,Altay 836500,China)

机构地区：[1]阿勒泰地区气象局,新疆阿勒泰836500

出　　处：《沙漠与绿洲气象》2022年第1期18-23,共6页Desert and Oasis Meteorology

基　　金：中亚大气科学研究基金(CAAS201921)。

摘　　要：运用2010—2018年夏季阿勒泰地区区域自动站逐时降水量及阿勒泰站探空资料,统计分析短时强降水过程的T-ln P形态及关键环境参数特征,以集合预报箱形图确定关键环境参数阈值。结果表明,阿勒泰地区短时强降水T-ln P图形态可分为整层湿和上干下湿2种类型;主要出现在沿山、山麓、山区地带和乌伦古湖南部附近;6月下旬—7月下旬多发,午后至傍晚较易发生;造成该地区夏季短时强降水的环境参数多表现为7月最大、6月最小,说明7月更有利于短时强降水的发生;该地区夏季短时强降水的发生表现为一定的不稳定层结,露点温度维持在10℃左右,垂直风切变为中等偏弱,CAPE值较小;总结归纳出该区短时强降水总体阈值。By using hourly precipitation data of regional automatic station and radiosonde data of Altay station in the summer of 2010-2018 in Altay region,this study statistically analyzed the T-ln P and key environmental parameters of in the process of short-term heavy precipitation,and used box graph statistics of ensemble forecast to determine the key threshold value of environmental parameters.The results show that the T-ln P pattern of short-term heavy precipitation in Altay region can be divided into two types:whole-layer-wet and upper-layer dry and lower-layer wet,which mainly occur along the mountain,in the foothills and mountainous areas,and near the southern part of Lake Ulungur,and most occur in late afternoon to evening,from late June to late July.The environmental parameters that cause the short-term heavy precipitation in summer in this region mostly show the maximum value in July and the minimum value in June,which indicating that July is more conducive to the occurrence of short-term heavy rainfall.The occurrence of short-term heavy precipitation in this region in summer is characterized by unstable stratification,the dew point temperature is maintained at about 10 ℃,the vertical wind shear is medium-weak,and the CAPE is small.By analyzing the box diagram of each environmental parameter,the total threshold of short-time heavy precipitation in this area is summarized.

关 键 词：阿勒泰地区 短时强降水 环境参数 

分 类 号：P456.1[天文地球—大气科学及气象学]