| 摘要: |
| 本文利用常规观测资料、逐小时区域自动站观测资料、NCEP1°× 1°逐6小时再分析资料等对安顺2019年6月5-11日和9月5-10日的持续性暴雨天气进行分析，结果表明：（1）6月5-11日天气过程主要是由于两高之间不断有短波槽东移造成的，9月5-10日天气过程主要是由于副高稳定少动，西南涡在副高外围稳定维持较造成的；（2）垂直螺旋度垂直积分越大越有利于产生强的短时强降雨，垂直螺旋度强中心发展高度越高越有利于短时强降雨持续不断的产生；（3）水汽垂直螺旋度在这2次持续性暴雨天气过程中对短时强降雨的发生和降雨强度有很好的指示，水汽垂直螺旋度在短时强降雨出现前6小时出现增大，且中心值越大短时强降雨强度越强，在短时强降雨发生期间迅速减小；（4）6月5-11日天气过程中，质量垂直螺旋度值增大-减小得越多，出现的短时强降雨强度越强。 |
| 关键词: 持续性暴雨 垂直螺旋度 TBB 水汽垂直螺旋度 |
| DOI： |
| 投稿时间：2021-10-14修订日期：2022-02-18 |
| 基金项目:贵州省气象局科研业务项目安顺市2019年持续性暴雨天气研究 |
|
| Comparative analysis of helicity of two continuous rainstorm weather |
| mengjun |
| (Anshun Meteorological Bureau) |
| Abstract: |
| Based on the conventional data ,hourly regional automatic station observation data, and NCEP 1°× 1°reanalyzes data every 6 hours during the heavy rain occurred in Anshun City, Guizhou Province on June 5-11 and September 5-10, 2019.The results show that:(1)The weather process was mainly caused by the continuous eastward movement of short wave trough between the two highs, resulting in the generation from June 5-11,and the weather was mainly caused by the stable and less movement of the subtropical high, the stable maintenance of the southwest vortex around the subtropical high from September 5-10.(2)The larger the vertical integral of vertical helicity, the more favorable it is to produce strong short-term heavy rainfall,and the higher the development height of the strong center of vertical helicity, the more conducive to the continuous generation of short-term heavy rainfall.(3)The moisture vertical helicity has a good indication of the occurrence and intensity of short-term heavy precipitation in the two continuous rainstorm weather processes.The moisture vertical helicity increases 6 hours before the occurrence of short-term heavy precipitation, and the larger the value, the stronger the short-term heavy precipitation, and the moisture vertical helicity decreases rapidly during the occurrence of short-term heavy precipitation.(4)During the weather process from June 5 to 11, the more the mass vertical helicity increases and decreases, the stronger the short-term heavy rainfall intensity. |
| Key words: Continuous rainstorm;Vertical helicity;TBB; Moisture vertical helicity |
