摘要
利用常规观测资料和气象卫星、自动站、加密雨量站资料等,对2008年5月3日湖北省孝感市一次大暴雨天气过程进行诊断分析。结果表明,中尺度辐合是造成此次过程第一段强降水的主要原因,西风槽、西南涡和低空西南急流是其第二段强降水的主要影响系统;温度露点差<4℃、K指数≥36℃、Δθse700-850<0℃与两段暴雨过程存在较好的对应关系;整个过程主要是3个中尺度对流云团活动所致,云团具有明显的中尺度特征;地面中尺度辐合线的强度变化及其移动,与两段强降水的强度及落时、落区变化有较好的对应关系。
The cause of a heavy rainstorm process occurred in Xiaogan of Hubei Province on 3rd May 2008 was analyzed by using the conventional data, satellite image and the observations got from the automatic weather stations and the ground intensive rainfall stations. The results showed that the process included two strong precipitation periods. The mesoscale convergence is the main reason for the heavy precipitation during the first period, and the westerly trough, the southwest vortex and the low-level south-west jet are the main reasons in the second period. Dew point temperature difference being lessthan 4 ℃, K index being more than 36 ℃ and Δθ700-850〈0℃ being less than 0 ℃ is related closely with the heavy rainstorm during two periods. The whole process was caused by the activities of three mesoscale convective clouds. The intensity variations of ground mesoscale convergence line and its movement had a good relationship with the variation of the rain intensity, time and area during the two heavy precipitation periods.
出处
《暴雨灾害》
2009年第1期51-57,共7页
Torrential Rain and Disasters
关键词
大暴雨
西风槽
切变线
西南涡
中尺度辐合线
Heavy Rainstorm
Westerly Trough
Shear Line
Southwest Vortex
Mesoscale Convergence Line
