【作者】 袁慧敏； 韩经纬； 李一平； 张敏； 韩理；

【Author】 Yuan huimin;Han jingwei;Li yiping;Zhang min;Hanli;Inner Mongolia Meteorological Observatory;

【机构】 内蒙古自治区气象台；

【摘要】 本文应用1x1的NECP再分析资料、常规资料、地面自动站资料及雷达资料对2013年6月30日15时鄂尔多斯市北部地区出现的冰雹、暴雨过程进行比较全面、深入的分析研究,结果指出:西风带的单体小高压与西太平洋副热带高压脊之间的切变线上,有次天气尺度和中尺度的低压中心向东传播,下游副热带高压对上游西风带低值系统的阻塞作用,造成系统滞留、移速减慢,迫使强烈上升运动气流在鄂尔多斯市北部的持续以及副热带高压在35°N-37°N,110°E附近不断摆动重复出现,使这一地区产生暴雨以上的降水过程;与暴雨区相联系,存在一支横越低空急流的经向垂直环流,暴雨区处于该垂直环流的上升支,降雹时段东胜站形成一个中尺度的雷暴高压,且垂直环流处于中尺度雷暴高压内;东胜站探空资料分析研究发现大气中存在有相当厚的不稳定层结,0℃层位于5000米附近,不稳定层结顶部温度为-20℃(云顶温度<-20℃),均有利于强冰雹的形成,有强的垂直风切变,云内含水量丰富,云内有倾斜的、强烈而不均匀的上升气流,是出现此次冰雹暴雨天气的主要原因。通过此次天气成因的分析研究可为以后预报提供一定的依据。更多还原

【Abstract】 This article application of 1x1 NECP data, conventional data, automatic ground station data and radar data, comprehensive and in-depth study of rainstorm hail process occurred in northern regions of Ordos City, at 15 o’clock on June 30, some interesting results obtained: background circulation situation found that between Westerly belt in a small monomer high pressure and the western Pacific subtropical ridge exists shear line, have sub-synoptic scale and mesoscale low pressure center eastward propagation, downstream of the subtropical highs‘ blocking effect to upstream Westerly belt low system, cause the system moving speed slows down and stranded, and the subtropical high continuously repeated swing near the 35°-37°N, 110°E,produce rainstorm process in the region; Associated with rainfall areas, there is a meridional vertical circulations across the low-level jet, rainfall areas in the ascending branch of the vertical circulation, hail periods forming a mesoscale thunderstorm high, and vertical circulation at the mesoscale thunderstorms high inner; 53543(Ordos) station sounding data analysis found that there is quite a thick unstable stratification in the atmosphere, 0 ℃ layer is located 5000 meter which conducive to the hail formation height, cloud top temperature <-20 ℃, have strong wind shear, cloud contains abundant water, cloud has sloping and uneven strong updrafts, which is the main reason that cause the hail, rainstorm process, through this analysis to provide a basis for future forecasting.更多还原