青藏高原东北部两次大到暴雨雷达和云图对比分析  

Contrastive analysis of two heavy-hard rainfalls radars and cloud plots in the northeast of Qinghai-Tibet Plateau

作　　者：田成娟[1] 朱玉军[1] 马琼[1] 朱平[1] TIAN Cheng-juan ZHU Yu-jun MA Qiong ZHU Ping(Qinghai Meteorological Observatory, Xining, Qinghai 810001)

机构地区：[1]青海省气象台,青海西宁810001

出　　处：《青海师范大学学报（自然科学版）》2017年第2期78-83,共6页Journal of Qinghai Normal University(Natural Science Edition)

基　　金：青海省气象局预报员专项"2015年青海东部两次区域性大到暴雨个例对比分析"项目资助

摘　　要：利用常规观测、NCEP/NCAR1°×1°再分析、自动站、西宁多普勒雷达、卫星云图及TBB资料,对2015年6月19~20日(简称"6.19")和2015年8月1-3日(简称"8.1")发生在青海省东部的两次区域性大到暴雨天气从环流背景场、雷达回波、卫星云图及TBB进行对比分析,结果表明:(1)两次过程都是在有利的大尺度环流背景下发生,地面有冷空气从河西走廊扩散南下,伴有辐合线.(2)"6.19"是混合云系造成,水汽图像上表现为白亮、密实的区域,TBB>-33℃,"8.1"为结构紧密、呈椭圆形的中尺度对流云团,TBB<-73℃.(3)"6.19"为混合型降水回波,"8.1"为"S"型回波,强度达到55dBZ,强中心高度15km,形成"列车效应",0℃层高度偏高,有逆风区存在,"S"型气旋性的辐合等典型的强降水单体回波的特征,VIL经历了两次爆发式的增长及突然降低的现象.Based on the conventional observations, NCEP/NCAR1 ° × 1 ° reanalysis, automatic station, Xining Doppler radar, satellite cloud image and TBB data, circulation background, radar echo, satellite cloud and TBB is comparative analysized of two regional heavy-hard rainfalls in east of Qinghai Province on June 19 to 20 （‘6.19’for short）and August 1 to 3（‘8.1’ for short）2015, The results show that.（1） two processes both occurs in the favorable large-scale circulation, the ground has a cold air from the Hexi Corridor spread south, accompanied by convergence line. （2） ‘6.19’is caused by mixed cloud system, the water vapor image shows white and dense area, TBB〉-33 ℃ ,‘ 8.1＇ is a mesoscale convective cloud with compact structure with oval shape, TBB 〈-73℃. （3） ‘6.19＇ is the mixed precipitation echo, ‘8.1＇ is the ‘S＇ type echo, the intensity reaches 55dBZ, the strong center height is 15km, has the formation of ＂train effect＂, 0℃ layer height is high, There are upwind area, ‘S’ type cyclonic convergence and other characteristics of the typical heavy precipitation monomer echoes, VIL experienced two bursts of growth and sudden reduction of the phenomenon.

关 键 词：大到暴雨 雷达回波 卫星云图 对比分析 

分 类 号：P458.121.1[天文地球—大气科学及气象学]