华南前汛期大范围暴雨的合成分析

Synthetic Analysis of Large Scale Rainstorm in Pre-flood Period in South China Area

利用多时间尺度 NCEP/ NCAR再分析资料、TBB资料 ,通过合成分析、动力诊断等方法 ,对华南大范围暴雨高低空共同特征进行了探讨 ,得出 :华南暴雨区位于 2 0 0 h Pa高空急流入口的右侧 ,高空辐散中心区下方 ,同时位于 2 0 0 h Pa南亚高压北缘和中纬度脊前辐散气流中。对于低层而言 ,暴雨区位于 85 0 h Pa低空急流轴的左侧。

Through the probe into the common features in upper and lower levels during the large scale rainstorm in south China area by way of synthetic analysis and dynamic diagnosis, based on multi time scale NCEP/NCAR reanalysis information and TBB information, conclusion is made in this paper as follows: The south China rainstorm area is located at the right side of 200hPa upper level jet stream inlet, under the central divergence field, and, in the mean time, at the north side of 200hPa South Asia high pressure and in mid latitude front ridge divergence current. As to the lower level, the rainstorm area is located at the left side of 850hPa lower level jet stream axis.