大连地区一次强降水过程分析

Analysis on A Heavy Rainfall Process in Dalian

利用NCEP资料分析了2012年6月29～30日大连一次暴雨过程，结果表明，高空长波槽和稳定的副热带高压是这次降水的影响系统；大连地区位于西伸的副热带高压后部和东移的高空槽槽前，中低层较强的西南气流为降水提供了水汽条件；中低层的垂直运动旺盛是这次降水产生的关键动力因子；副高西伸是触发暴雨的热力因子；雨强最大阶段，500hPa处于负变温，而850hPa高度为正变温，上冷下暖的热力结构利于中低层不稳定能量的释放。

An inlensity rainfall proeess from 29 June to 30 June in 2012 was analyzed by using NCEP data. The results showed that the upper-level long-wave trough and stable subtropical high are the crucial intluencing system. DAHAN located in the back of westward subtropical high and the front of eastward upper-level trough. The strong southwest airflow supplied vapor condition in the middle and low layer. The strong ver-tical motion in the middle and low layer is the important dynamic factor. And the westward subtropical high is the trigger thermal factur. In the maximum stage of the raintall intensity, the changed temperature is negative at 500 hPa while positive at 850hPa. The atmosphere shows that the upper air is cold while the lower air is warm. This structure is favorable to the release of unstable energy.