2023年通辽市科左中旗两次强降水过程特征分析
Analysis of the Characteristics of Two Heavy Precipitation Processes in Horqin Left Middle Banner, Tongliao City in 2023

本文利用常规观测资料、EC再分析资料，对通辽市科左中旗2023年7月发生的两次强降水过程进行了对比分析。结果表明：两次强降水均是受到高空槽控制下的典型层状云降水过程。7.4强降水主要受锋面过境影响，局地致灾性更强，K指数更依赖锋面过境对中层饱和程度的贡献；7.22强降水则主要受副热带高压和西南低空急流影响，范围更广、持续时间更长、整体强度更强，西南低空急流对850~500温度直减率、低层水汽条件的提升使其对K指数的贡献更大。
Using the conventional observational data and EC reanalysis data, this paper makes a comparative analysis of the two heavy precipitation processes in July in Horqin Left Middle Banner, Tongliao City in 2023. The results show that the two heavy precipitation events are typical stratiform cloud precipitation processes controlled by high-altitude troughs. The heavy precipitation on 4 July is mainly affected by the frontal passage, which is more locally disastrous, and the K-index depends more on the contribution of the frontal passage to the saturation of the middle layer, while the heavy precipitation on 22 July is mainly affected by the horse latitudes and the southwest low-level jet, which has a larger range, longer duration and stronger overall strength. The southwest low-level jet contributes more to the K-index because of its improvement in the 850~500 temperature lapse rate and low-level water vapor conditions.