2017年6月湖南致洪暴雨的天气分析  

Diagnostic Analysis of Flood-resulting Rainstorm over Hunan Province in June 2017

作　　者：靳莉君[1] 黄昌兴[2] 朱春子[2] 刘静[1] 张麓瑀 高唯清 JIN Lijun;HUANG Changxing;ZHU Chunzi;LIU Jing;ZHANG Luyu;GAO Weiqing(Bureau of Hydrology,YRCC,Zhengzhou 450004,China;Information Center,MWR,Beijing 100053,China)

机构地区：[1]黄河水利委员会水文局,河南郑州450004 [2]水利部信息中心,北京100053

出　　处：《水文》2018年第5期91-96,共6页Journal of China Hydrology

摘　　要：利用实况观测资料和欧洲中长期天气预报中心再分析资料,对2017年6月底湖南一次致洪暴雨过程进行诊断分析。结果表明:高空冷涡和副高的稳定维持为暴雨发生提供了有利的大尺度环流条件,中低层低涡切变线和地面锢囚锋是此次暴雨的主要影响系统。2支高空急流增强和靠近诱发了低空急流爆发,高低空急流耦合形势的增强促进了暴雨的持续和加强。低空急流为暴雨发生提供了充沛的水汽和不稳定能量,暴雨区表现为显著的对流不稳定,并且在假相当位温垂直梯度增加的阶段对应暴雨强度亦增大。水汽通量以及辐合大值区对暴雨落区预报具有一定的指示意义。Based on the real-time observed data and ERA-Interim 1°× 1° 6h reanalysis data, the flood-resulting rainstorm over Hunan Province in June 2017 were diagnostically analyzed. The results show that the upper cold vortex and subtropical high were remain steady, which formed a favorable large scale environment for the rainstorm occurring, and the low vortex shear line and ground occluded front were the major influencing systems. The enhancement and proximity of 2 high level jet induced the eruption of the low level jet. Because of the enhancement of the coupling of high and low level jet, the rainstorm was strengthened and sustained. The low level jet provided abundant water vapor and unstable energy for the occurrence of the rainstorm. The rainstorm area showed significant convective instability, and the intensity of rainstorm increased with the increase of vertical gradient of pseudo equivalent temperature. The large area of water vapor flux and convergence provided references for forecasting the falling area of rainstorm.

关 键 词：致洪暴雨 湖南 高低空急流 水汽输送 

分 类 号：P426.616[天文地球—大气科学及气象学]