珠江三角洲地区热带气旋逐时雨量分布特征

利用广东省自动观测站、常规地面站的逐时降水量资料,对1999-2002年登陆珠江三角洲地区的热带气旋进行了动态合成等分析.结果表明,登陆前后广东的逐时雨量和热带气旋本身的逐时雨量都发生了变化;热带气旋降水具有明显的不对称性,降水量级越强,分布不对称性越明显;随着降水量级的减弱,最大出现概率圈有外移的趋势;极强和强等级时雨量的落区与热带气旋移动方向有关.

Hourly precipitation distribution of tropical cyclones landing Zhujiang River Delta

The moving composition analysis of tropical cyclones landing Zhujiang River Delta during 1999-2002 is performed by the data of hourly precipitaion from routine and automatic observatories in Guangdong province,China. It is shown that hourly precipitaion either of Guangdong or of tropical cyclone itself changes during landfall. The precipitaion distribution of tropical cyclone is asymmetric obviously. The higher the precipitaion grade, the more asymmetric the distribution is. There is a out moving trend of the maximum probability circle accompanying the decrease of precipitaion grade. The location of extreme strong and strong grades precipitaion is related to the moving direction of tropical cyclone.