【摘要】 通过资料的统计分析,证明吉林省大范围大暴雨和局地大暴雨之间存在着明显的差异.大范围大暴雨不仅暴雨区面积大、水汽充沛、整层湿润、含有较大的内能,而且几乎都是由台风造成的——至少影响吉林省面积最大的九次大暴雨都如此.大范围大暴雨与环境场密切相关,而局地大暴雨与东亚环流关系不大.经过计算得到大范围大暴雨所需水汽,仅靠影响系统是不够的,它需要有大量源源不断水汽的补充,而局地大暴雨则所需水汽依靠影响系统已足足有余.更多还原

【Abstract】 Statistical analysis has shown that there exists the obvious difference between large area and local heavy rain. The characteristics of large area heavy rain are not only great rain-area, rich in vapour moist in whole layer and high potential energy, but also nearly all typhoon-caused. At least, so are nine heavy rains which had the greatest affecting area in Jilin province. The large area heavy rain is in close relationship with background circulation, but the local heavy rain is not. It is found by calculation that, the vapour only coming from the affecting system, is insufficient for the large area heavy rain, but sufficient for the local; as a result, the continuous complement of vapour in large quantities is required by the large area heavy rain.更多还原