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2009年广东前汛期一次连续性特大暴雨的特征及成因
引用本文:黄晓东,梁巧倩,郑伟杰,梁敏妍.2009年广东前汛期一次连续性特大暴雨的特征及成因[J].广东气象,2009,31(6):5-9.
作者姓名:黄晓东  梁巧倩  郑伟杰  梁敏妍
作者单位:1. 江门市气象局,广东江门,529030
2. 广州中心气象台,广东广州,510080
基金项目:江门市气象局项目"江门地区暴雨的诊断分析"资助 
摘    要:用地面常规站、自动气象站资料,探空资料,卫星云图产品及NCEP/NCAR1°×1°每6h再分析资料等,对2009年5月23-24日广东中西部沿海地区的连续性特大暴雨进行了分析。结果表明:此次强降水持续时间长、强度大、降水落区集中,具有明显的中α尺度特征。由于西太平洋副热带高压稳定维持,南海中尺度涡旋和偏南风低空急流快速北抬;涡旋北侧的暴雨区为强辐合上升区;索马里越赤道气流、孟加拉湾西南季风气流及110°E越赤道气流汇流形成强盛而狭窄的季风涌水汽输送带,为暴雨区提供充分的水汽和不稳定能量。两次中尺度对流云团的强烈发展造成了此次强降水;而高层的环流形势有利于对流云团在珠江口西侧的稳定少动。

关 键 词:天气学  南海季风涌  中尺度涡旋  大暴雨  广东

A Case Study of Continuous Torrential Rain in Guangdong during the Pre-flood Period in 2009
HUANG Xiao-dong,LIANG Qiao-qian,ZHENG Wei-jie,LIANG Min-yan.A Case Study of Continuous Torrential Rain in Guangdong during the Pre-flood Period in 2009[J].Journal of Guangdong Meteorology,2009,31(6):5-9.
Authors:HUANG Xiao-dong  LIANG Qiao-qian  ZHENG Wei-jie  LIANG Min-yan
Institution:HUANG Xiao - dong , LIANG Qiao - qian, ZHENG Wei -jie, LIANG Min -yan(1. Jiangmen Meteorological Bureau, Jiangmen 529030, China ;2. Guangzhou Central Meteorological Observatory, Guangzhou 510080, China)
Abstract:A continuous torrential rain case in the middle -west coastal areas of Guangdong from May 23rd through the 24th 2009 is analyzed using conventional ground - based observations and soundings, as well as unconventional data such as automatic weather stations, satellite products, and NECP/NCAR 1°×1° 6-hourly reanalysis data. The results are shown as follows : the characters of this torrential rain case are long duration, strong intensity, and area - concentrated with significant meso-α scale atmospheric motion ; South China Sea mesoscale eddies and low - level jet moved northward quickly while the western pacific subtropical high maintained stable; There was favorable convergence coincident with the torrential rain area on the north flank of mesoscale eddies ; The confluence of southwest monsoon flow from Bengal Bay and cross - equatorial flow from Somali and the area near 110oE came into a strong and narrow conveyer belt to transport sufficient moisture and unstable energy to the torrential rainfall areas ; There were two mesoscale convective complexes ( MCC ) developing violently and resulting in the torrential rain ; And the high - level circulation kept the MCCs quasi - stationary over the west of the Pearl River estuary.
Keywords:synoptic  South China Sea monsoon surge  mesoscale eddies  torrential rain  Guangdong
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