一次非典型秋季冷空气暴雨过程分析  

Analysis on a Non-typical Torrential Rain Event Associated with Cold Air in Autumn

作　　者：罗聪 高亭亭 李怀宇 

机构地区：[1]广州市气象台,广东广州510080

出　　处：《广东气象》2011年第5期4-7,共4页Guangdong Meteorology

基　　金：广州市气象局项目"强降水实时监测预警系统"资助

摘　　要：利用常规气象资料、加密气象站观测资料、1°×1°的NCEP再分析资料以及多普勒雷达资料,诊断分析2010年10月14～15日广东南部的非典型冷空气暴雨过程。分析结果表明:(1)此次暴雨过程的中尺度特征较为明显;(2)垂直上升运动先于强降水出现前即有明显反映,而低层水汽辐合与降雨量级的同时性较为一致;(3)前期不稳定能量的累积是必要条件,冷锋的入侵则是触发机制,而对流有效位能(CAPE)的分布对暴雨落区有一定的指示意义;(4)雷达径向速度场的辐合区范围大小和时间演变对于判断回波能否继续发展增强有一定的指示意义。Diagnostic analysis on a non-typical cold air associated torrential rain in Southern Guangdong is performed by using conventional observational data, automatic weather station data and the NCEP reanalysis data（ 1 × 1 deg ） as well as the Doppler radar data. Results show that （ 1 ） obvious mesoscale characteristics can be identified in this case; （2） vertical upward motion began in advance of the occurrence of the heavy rain, while the low level moisture convergence agreed well in time with the intensity of precipitation ; （3） accumulation of the instability energy beforehand is necessary, the invasion of the cold front is the trigger mechanism, and the distribution of the convective available potential energy （CAPE） in a degree indicates the probable torrential rainfall areas; （4） the intensity and the development of radial velocity convergence of radar can give us some indications of the evolution of the convective echoes.

关 键 词：天气学 暴雨 冷空气 中尺度分析 水汽通量辐合 

分 类 号：P44[天文地球—大气科学及气象学]