一次辽宁暴雨过程的诊断及风场反演分析

Analysis of the Diagnosis and Wind Reflex about a Rainstorm in Liaoning

摘要:

2011 年 7 月 30 日辽宁地区发生了一次区域性大暴雨过程，利用常规自动站、NCEP 再分析资料及双多普勒雷达和风云 2E 卫星资料对这次过程进行综合分析， 结果表明： 这次降水过程的发生主要是由于东北冷涡底部高空槽及低层暖切变的共同影响，西南低空急流源源不断的向北提供暖湿气流并在辽宁省堆积，为降水提供较好的水汽和热力条件，同时风场低层辐合高层辐散，以及强大的潜在不稳定能量释放为降水提供了较好的动力和不稳定条件。双雷达反演得到的 1.5 km 高度上的水平风场的辐合辐散，强回波区域以及 TBB 低值区在暴雨的发生过程中与降水大值区及降水落区的移动方向有很好的对应关系。

Abstract: Based on the regular observational data, NCEP final analysis data, dual Doppler radar productions, and fy-2E meteorological satellite data, the regional rainstorm over Liaoning province on July 30, 2011 was comprehensively analyzed. The results indicated that the precipitation process occurred mainly due to the combined effects of NECV bottom upper-level trough and lower warm shear. South-west LLJ provided a steady stream of warm air accumulating in Liaoning province, which formed better water vapors and precipitation heat conditions. Meanwhile low-level wind convergence and upper level divergence, and a release of the strong potential unstable energy provided better power and unstable conditions for the precipitation. The dual radar reflex revealed that the 1.5 km horizontal wind convergence, strong echo area, and TBB low areas in the rainstorm had good correspondences with the movements of big value precipitation area and precipitation area.