台风“莫拉菲”移动路径和降水诊断分析  

Diagnostic Analysis on Track and Precipitation of Typhoon Molave

作　　者：梁宏升 

机构地区：[1]汕头气象局,广东汕头515041

出　　处：《海洋科学进展》2011年第1期28-36,共9页Advances in Marine Science

基　　金：汕头市气象局科技课题项目--登陆影响广东的热带气旋特点分析(2010)

摘　　要：利用1°×1° NCEP再分析资料、卫星云图和中尺度自动站等气象资料,分析了环流背景对台风莫拉菲的路径和降水变化的影响,并对莫拉菲的降水过程的物理量特征进行诊断分析。结果表明,500 hPa副热带高压带状分布,副高南缘偏东气流加强,台风北侧最大东风风速与南侧最大西风风速之差增大是造成台风路径变化并稳定向西北偏西方向移动的主要原因;莫拉菲在向西北偏西方向移动过程中,其水汽通量相对散度、垂直速度、涡度等各物理量场均表现出有利于强降水出现的特征,也揭示了此次台风造成的强降水出现地区性差异的主要原因。Based on 1°×1° NCEP reanalysis data,hourly satellite data,conventional meteorological data,and automatic station data,the influences of circulation background on the track and precipitation of Typhoon Molave are synthetically analyzed.Also the physical characteristics are diagnostically analyzed.It is shown in the results that the main causality for the typhoon track instability and steadily maintaining its moving direction toward the west-northwest is the narrow extention of the sub-tropical high on 500 hPa and the enhancement of the wind speed difference between the casterlies south of the typhoon and the westerlies north of the typhoon.Furthermore,the favourale physical characteristics,such as water vapor flux relative divergence,vertical velocity and vorticity all help the strong precipitation when Typhoon Molave moves west-northwest and the precipitation regionalization reveal the main causality for the regional variability of the strong precipitation strong.

关 键 词：台风 路径 强降水 水汽通量相对散度 

分 类 号：P76[天文地球—海洋科学]