基于物理量诊断的相似路径台风布拉万(1215)和玲玲(1913)影响辽宁不同区域强降水成因探究
Investigation on the Causes of Heavy Rainfall in Different Regions of Liaoning Influenced by Typhoons Bolaven (1215) and Lingling (1913) with Similar Tracks Based on Physical Quantity Diagnosis

2012年8月底和2019年9月初分别受台风“布拉万”和“玲玲”影响，辽宁地区出现两次强度不同的暴雨天气。本文利用ECMWF再分析资料和辽宁地区观测站资料对辽宁地区两次暴雨过程进行物理量诊断对比分析。结果表明：两次台风过程也均有充足的水汽条件能够产生暴雨，但“布拉万”影响期间，大范围水汽输送和水汽辐合更显著，位置更偏西，产生了更大的降水量，落区偏西；两次台风暴雨过程中辽宁上空均有暖湿空气相配合，850 hPa假相当位温均超过64℃；“布拉万”过程的辽宁中部和“玲玲”过程的辽宁东部，存在低层辐合、高层辐散的动力配置结构，有利于降水产生；此外，“布拉万”过程，沈阳和丹东站均有明显上升运动，“玲玲”过程，沈阳站上升运动不明显，丹东站上升运动明显。
In late August 2012 and early September 2019, the Liaoning region was affected by Typhoon Bolaven and Typhoon Lingling respectively, experiencing two rainstorm events with different intensities. This paper uses ECMWF reanalysis data and observational station data in the Liaoning region to conduct a comparative analysis of physical quantity diagnosis for the two rainstorm processes in the Liaoning region. The results show that during both typhoon processes, there were sufficient water vapor conditions to generate rainstorms. However, during the influence of Bolaven, the large-scale water vapor transport and water vapor convergence were more significant, located more to the west, resulting in greater precipitation and a west-ward-shifted precipitation area. In both typhoon-induced rainstorm processes, warm and humid air was present over Liaoning, and the pseudo-equivalent potential temperature at 850 hPa exceeded 64？C. In the central part of Liaoning during the Bolaven process and the eastern part of Liaoning during the Lingling process, there was a dynamic configuration structure of low-level convergence and high-level divergence, which was conducive to the generation of precipitation. In addition, during the Bolaven process, there was obvious upward motion at both Shenyang and Dandong stations. During the Lingling process, the upward motion at Shenyang station was not obvious, while that at Dandong station was obvious.