不同尺度云团系统上下游的传播与1998年长江流域大暴雨

利用加密的卫星和雷达资料,对云团系统的传播和发展与1998年长江大暴雨的关联进行了探讨.结果表明,热量和水汽的输送通道的重建以及青藏高原低涡向长江流域的传播是1998年7月长江流域大暴雨发生的重要背景条件,它们向下游输送和传播的形式有3种类型,即纬向型、西南型和混合型;而下游地区多个中尺度对流系统的连续生成及其不同形式的组合、发展则是过程降水异常的关键因素.

The Propagation and Development of Cloud Cluster Systems and Severe Precipitation Event in 1998

The propagation and development of cloud cluster systems are analyzed during heavy precipitation based on satellite and radar data. The results show that the re-built of the large-scale transport belt about heat and moisture or the propagation of the low vortex were the most important condition for the occurrence of this event, there are three models of propagation, i.e., latitude type, southwest type and mixed type. The continuous development of the meso-scale convective systems (MCS) is a key factor of the formation of the strongest precipitation center.