【摘要】 本文分析了华南前汛期低空急流与暴雨落区的统计关系,低空急流附近的涡度、散度与垂直速度的分布特征以及相关联的天气过程,指出造成暴雨的次天气尺度或中尺度系统与低空急流虽有密切的关系,但却是相对独立的.低空急流附近的散度场与垂直环流主要取决于这类系统的活动。在不同的天气形势下这类系统的不同活动特点,造成暴雨区与低空急流间几类不同的配置关系.更多还原

【Abstract】 The statistical relation between the hard rain area and the low lev e jet over South China during the earlier rainy season,as well as the basic features of vorticity,divergence and vertical circulation about the jet and related synoptic situation are analysed in this paper.It is pointed out that though the medium or meso scale systems which are responsible to hard rain and the jet stream are interrelated, they differ from each other.The divergence and vertical circulation about the jet axis depend on the activity of the medium or meso scale systems.The hard rain area depend to a large extent on the behavior of these systems under various synoptic patterns.更多还原