【摘要】 根据暴雨发生和持续依赖于对流层低层水汽辐合的事实,重点针对持续性暴雨维持机制这一重要问题,从天气学和动力学方面分析了1989年7月9～10日四川盆地东部持续性暴雨维持机制。分析结果发现,大气运动非平衡强迫、凝结降水的非均匀分布与强烈垂直风切变的耦合作用、“湿度锋”与低空急流的耦合相互作用通过促进低空辐合流的维持,导致了对流云团和暴雨天气的持续。更多还原

【Abstract】 According to the occurrence and maintenance of torrential rain relating closely to moisture convergence increment in low layer of troposphere,a new type of divergence equation is applied to analyse physical mechanics of the maintenance of torrential rain process in the east of Sichuan basin from 2 to 6 July,1989. The results show that unbalance force of atmospheric motion and the coupling reaction among convective cloud cluster and moisture frontal zone and low level jet lead to the continuation of strong convergence in low layer and the maintenance of torrential rain.更多还原