摘要
将1998年5～7月华南暴雨和南海季风科学试验期间香港天文台提供的风廓线雷达资料和香港的每小时天气现象及雨量进行了详细的对照发现,风廓线资料可以揭示出西南季风中和行星边界层中与暴雨相联系的中尺度现象,2km高度以上的低空急流中心早于2km高度以下超低空急流中心1～2小时出现,强降水的出现和超低层急流风速中心的出现相对应的。设计了一个表征低空急流强度和高度的指数I,它可以清楚地表示出降水强度与低空急流之间存在密切的关系。分析表明在指数I迅速加强后1～2小时内将出现强降水,因此风廓线对强降水的出现有一定的预示性。
The detailed analysis and comparisons are made on the data of Hongkong wind-profiler and the weather/precipitation every hour during the HUAMEX and the experiment for the monsoon of the South China Sea (SCSMEX) in 1998. It is found that the wind-profiler data could reveal the meso-scale phenomena in the Southwest Monsoon and PBL, which was closely related to rainstorms. The center of low Ievel jet under 2km altitude, which corresponded to the appearance of heavy rain, appeared 1 -2 hour after the center of low Ievel jet did above 2km altitude. An index I is designed to represent the intensity and height of the LLJ. This index can express clearly the close relationship between the precipitation and the LLJ. The results show that wind-profiler is somewhat predictive to a rainstorm.
出处
《热带气象学报》
CSCD
北大核心
2003年第3期285-290,共6页
Journal of Tropical Meteorology
基金
国家自然科学基金40233036
973项目(G1998040907)
高等学校重点实验室访问学者基金
关键词
风廓线
暴雨
低空急流
wind-profiler
heavy rain
low level jet
