一次东风波引起的暴雨过程分析  

Analysis of a Rainstorm Event Caused by Easterly Wave

作　　者：邓斌 董玲 DENG Bing;DONG Ling(Fuzhou Municipal Meteorological Observatory,344000,Fuzhou,Jiangxi,PRC)

机构地区：[1]抚州市气象局,江西抚州344000

出　　处：《江西科学》2018年第2期291-296,共6页Jiangxi Science

摘　　要：利用常规气象观测资料和NCEP1°×1°再分析资料,结合自动站加密资料对2017年8月25日20:00-26日08:00发生在江西南部的一次东风波暴雨过程进行分析。结果表明:这是一次发生在夏季东风波和近地面层冷空气共同作用下的暴雨过程。副热带高压控制使赣南地区积蓄不稳定能量;近地面层的弱冷空气触发对流发展;南海的偏东风急流为降水区域输送水汽。此次东风波表现为较深厚的波动特征,但在高层300hPa附近有正涡度中心,特征更显著。东风波的产生是由菲律宾以东洋面上的热带扰动波动向西北方传播诱发的。A heavy rainstorm caused by easterly wave in the southern of Jiangxi Province from 25 to 26 August 2017,is analyzed with the conventional meteorological data,1°×1°reanalyzed NECP data,and mesoscale automatic weather station data.The results indicate that this is a rainstorm process under the influence of easterly wave and cold air in the surface layer.Unstable energy is accumulated in the southern of Jiangxi Province because of the subtropical high pressure.Weak cold air in the surface layer make convective weather development.And the east wind jet in the south China sea provide water vapor for the precipitation area.The easterly wave is deep,but the higher-level feature is more pronounced because of there is a positive vorticity center near 300 hPa.The easterly wave is caused by the tropical disturbance in the east of the Philippines spreading to the northwest.

关 键 词：东风波 暴雨 正涡度 低层辐合高层辐散 

分 类 号：P458[天文地球—大气科学及气象学]