2016年6月浙江省一次区域性暴雨特征分析  

Analysis of the Characteristics of a Regional Heavy Rain in Zhejiang Province in June 2016

作　　者：毛程燕 龚理卿 廖君钰 李浩文 MAO Cheng-yan;GONG Li-qin;LIAO Jun-yu;LI Hao-wen(Meteorological Bureau of Quzhou City,Quzhou,Zhejiang 324000;Meteorological Observatory of Guangzhou,Guangzhou 511430)

机构地区：[1]衢州市气象局,浙江衢州324000 [2]广州市气象台,广东广州511430

出　　处：《广东气象》2018年第5期27-30,共4页Guangdong Meteorology

摘　　要：利用常规地面观测资料、NCEP/NCAR 1°×1°逐6 h再分析资料,对2016年6月28—29日浙江省一次区域性暴雨过程进行了天气动力学诊断分析。结果表明:(1)东移的西风槽与副热带高压对峙、中层弱冷空气入侵、700 hPa切变线及地面梅雨锋的存在是形成该次"列车效应"的主要原因;(2)来自南海的西南急流、500 hPa湿等熵面向下延伸及850 hPa高比湿为暴雨提供了良好的水汽条件; 200 hPa南亚高压分流辐散的抽吸作用更有利于水汽的垂直上升运动;(3)低层垂直螺旋度的迅速增大对暴雨的发生有良好的指示意义;(4) 400 hPa高空辐散和700 hPa低空辐合的耦合是该次暴雨的增强条件,正的散度差大值区与暴雨落区相吻合。Using surface observations and NCEP/NCAR 1°×1° 6-hourly reanalysis, this work carries out a diagnostic study on the synoptic and dynamic characteristics of a regional heavy rain that took place in Zhejiang province on June 28-29, 2016. The result is shown as follows. （1） This ＂train effect＂ was attributed to the ＂stand-off＂ between an east-moving westerly trough and a subtropical high, the progression of a mid-level weak cold air, a shear at 700 hPa and the presence of a surface Meiyu front. （2） A southwesterly jet stream from the South China Sea, the downward extension of an isentropic surface at 500 hPa and the presence of high specific humidity at 850 hPa were the favorable water vapor conditions for the heavy rain. The sucking effect of a bypassing and divergent South Asia high at 200 hPa was favorable for the vertical ascending motion of water vapor. （3） At the low level, the rapid increase of vertical helicity was a good indicator for the generation of the heavy rain. （4） The coupling of 400 hPa upper-level divergence with 700 hPa low-level convergence enhanced this heavy rain and the maximum value zone of positive divergence difference matched the area of the heavy rain in location.

关 键 词：天气学 区域性暴雨 系统耦合 垂直螺旋度 散度差 浙江省 

分 类 号：P44[天文地球—大气科学及气象学]