2016年4月23日福建省暖区暴雨过程成因分析  

Analysis of a warm zone heavy rainfall in Fujian on April 23th 2016

作　　者：陈艳真 刘爱鸣[2] 邓以勤 陈艺芳 

机构地区：[1]莆田市气象局,福建莆田351100 [2]福建省气象局,福建福州350001 [3]平潭综合实验区气象局,福建平潭350400

出　　处：《气象研究与应用》2016年第3期79-83,I0002,共6页Journal of Meteorological Research and Application

摘　　要：利用NCEP/NCAR 1°×1°逐六小时的全球再分析资料、风廓线和雷达回波及常规观测资料,对2016年4月23日福建省暴雨过程成因进行了分析。结果表明:西南低空急流和超低空急流是这次暴雨的主要影响系统,暴雨主要位于超低空急流左前侧的辐合区内和地面层辐合线附近,在低层辐合线的东南侧不断有回波生成,回波在西南气流的引导下往东北方向移动,同时超低空急流增强和北推的过程亦是回波开始有组织的发展和往东北移动过程;V-3θ图分析对这次暴雨天气有较好的指导作用;与低空急流相对应的低层正涡度中心是暖区暴雨的一个重要指标;高湿高能区的存在表明有湿热能量集中,的锋区和上干下湿的对流不稳定有利于激发释放大量不稳定能量,易产生暴雨天气。因此的锋区对暖区暴雨有着较好的指示意义。Based on NCEP 1°×1° reanalysis data, wind profile data, Doppler radar and AWS observational data, the warm zone heavy rainfall in Fujian on April 23th was studied by means of physical diagnosis. The results show that： low-level southwest jet and 925hPa jet are the main systems that trigger the rainfall. Precipitation center falls between the convergence area in 925hPa jet （left aside） and ground convergence line. Echo emerges consistently in the south of low level convergence line and moves northeast under the guidance of southwest flow along with the evolution of 925hPa jet stream. V-3θ diagram shows good guidance in this process. Low level vortex center associated with low level jet stream is an important factor in heavy rainfall; High θse means unstable energy concentration. θse front and convection instability with dry level above wet level can induce enormous energy, which triggers the heavy rainfall. So θse can be a good indicator of warm zone heavy rainfall.

关 键 词：暖区暴雨 西南急流 超低空急流 假相当位温 低层正涡度 

分 类 号：P458.121.1[天文地球—大气科学及气象学]