滇东北一次大范围强降水天气过程诊断分析  

Diagnosis and Analysis of A Large-scale Heavy Precipitation Weather Process in Northeast Yunnan

作　　者：周信荔 姜世荣 Zhou Xin-li(Yiliang Meteorological Bureau,Yiliang,Yunnan 657600)

机构地区：[1]云南省彝良县气象局,云南彝良657600

出　　处：《农业灾害研究》2023年第2期133-135,共3页Journal of Agricultural Catastrophology

摘　　要：2009年8月28日夜间至8月29日白天云南省昭通境内出现了一次大范围强降水天气过程,通过对高(低)空天气形势、物理量及动力条件进行诊断分析。结果表明:夏季青藏高压在东进南压过程中分离出的高压单体,与副热带高压减弱东退分离留下的高压单体在滇形成的切变式辐合,是形成此次暴雨的主要原因;高原东部的高压沿其前部的暖式切变线向东南移动,加剧了切变线东南一侧反气旋的上升运动,是此次大范围暴雨形成的中尺度影响系统。200 hPa高空急流和850 hPa低空急流的共同作用,为暴雨的发生提供了有利动力和水汽条件。A large-scale heavy precipitation process occurred in Zhaotong of Yunnan Province from the night of August 28 to the day of August 29,2009.The high(low)air weather situation,physical quantities and dynamic conditions were analyzed in this paper.The results showed that the high pressure monomer isolated from the Qinghai-Tibet high during the process of eastward compression in summer formed shear convergence with the monomer separated from the subtropical high during the weakening and eastward retreat in Yunnan,which was the main reason for the formation of the heavy rain.The high pressure in the east of the plateau moved southeast along the warm shear line in front of it,which intensified the upward movement of the anticyclone on the southeast side of the shear line,and was the mesoscale influence system of the large-scale rainstorm.The 200 hPa high level jet and 850 hPa low level jet together provide the driving force and water vapor conditions for the occurrence of heavy rain.

关 键 词：滇东北 强降水 切变线 诊断分析 

分 类 号：P458.121.1[天文地球—大气科学及气象学]