一次豫北暴雨的卫星云图特征分析

Analysis of Satellite Cloud Image Characteristics of a Rainstorm in Northern Henan

摘要: 本文利用葵花8号卫星资料结合数值模拟结果对2016年7月8日至9日在豫北发生的暴雨过程做了分析，结果表明：8日20:00山西省中部生成中尺度对流云团，500 hPa高度上对应有冷涡及风切变，切变线北侧冷平流加强，南侧暖平流加强，为云团东移提供动力条件；后云团分裂成多个对流单体向东移动，9日02:00移动至豫北西部，对流云团逐渐膨胀增大，暖平流变强，地面至450 hPa有上升运动，湿度较大，中尺度系统开始发展；9日05:00深对流云团完全覆盖豫北，暖平流再次加强，暴雨区上空850 hPa高度上出现强对流，雨强达到最大；9日08:00云团东移至豫北中东部，变形场形成，维持暖平流和对流运动，而后分裂出新的对流单体东移至豫北，维持至09:00；10:00~14:00云团逐渐东移减弱，变形场消失，直至9日20:00中尺度系统消亡，暴雨过程结束。

Abstract: Based on the data of Himawari-8 satellite and the numerical simulation results, the rainstorm process in Northern Henan from July 8 to 9, 2016 was analyzed. A mesoscale convective cloud cluster was formed in the middle of Shanxi Province at 20:00 on the 8th. The convective cloud was a cloud system with cold vortex and wind shear at the height of 500 hPa. The cold advection on the north side of the shear line was strengthened, and the warm advection on the south side was strengthened, which provided dynamic conditions for the cloud cluster to move eastward. The cloud cluster split into several convective cells and moved eastward. At 02:00 on the 9th, it moved to the west of North Henan Province. The convective cloud group gradually expanded and increased, and the warm advection flow was strong. There was upward movement from the ground to 450 hPa, and the humidity was high, and the mesoscale system began to develop. At 05:00 on the 9th, the deep convective cloud cluster completely covered Northern Henan, and the warm advection strengthened again, even stronger convective cloud cluster appeared at 850 hPa height in the rainstorm area. At 08:00 on the 9th, the cloud cluster moved eastward to the central and eastern part of Northern Henan, and the deformation field formed to maintain the warm advection and convective movement, and then the new convective cell separated moved eastward to the north of Henan and maintained until 09:00; 10:00~14:00, the cloud group gradually moved eastward and weakened, and the deformation field disappeared until the mesoscale system disappeared at 20:00 on the 9th, and the rainstorm process ended.