摘要
利用多普勒雷达资料、边界层风廓线雷达资料、中尺度自动站、NCEP 1°×1°的6 h分析资料等,从环流背景特征、物理量特征、雷达图象特征分析2011年10月13～14日广州出现的历史同期罕见暴雨的成因。结果表明:冷空气入侵及副高脊的进退是此次大暴雨的触发背景;广州上空强烈的垂直上升运动、持续的西风槽前西南水汽输送和低层切变南部的东南水汽输送等为大暴雨的发生和维持提供了有利条件。中低层风向的顺时针旋转的建立和破坏以及风速的迅速增强和减弱与降水开始、结束同步,冷暖空气的交汇期也是强降水的高峰期。
Causality analysis on an unusual rainstorm in Guangzhou during 13-14 October,2011 is conducted from the perspective of background circulation,radar signatures and physical elements with the data of doppler radar,boudary layer wind profiler,mesoscale automatic weather station and the NCEP reanalysis data（1×1deg）.Results show that cold air instrusion,movement of the sutropical high ridge triggered the heavy torrential rain event;vertical motion above Guagnzhou,convergence of perstistent southwest moisture jet ahead of westerly trough and the southeast watervapor transportation to the south of low level shear are favorable for the initialization and the maintenance of the heavy rainfall.The start（end） of clockwize rotation of wind direction and the rapid strengthening（Weakening） of wind speed in mid-low layers agreed well with the start（end） of rainfall event;and the covergence of cold and warm air brought the peak of the rainstorm.
出处
《广东气象》
2012年第1期10-14,共5页
Guangdong Meteorology
