Analysis of a Disastrous Rainstorm Process Affecting Yan an in July 2013

• 作者: Hao Yu Liang Jia Qu Zhi
• 来源期刊: 气象与环境研究:英文版
• 学科: 地球科学
• 关键词: RAINSTORM Characteristics of LARGE-SCALE CIRCULATION Yan AN
• 年，卷（期）: 2019,（1）
• 页码范围: 1-5
• 页数: 5页
• 分类号: P

摘要

Based on the MICPAS data and 0.75°×0.75° reanalysis data of the European Center, the characteristics of large-scale circulation in the rainstorm process in Yan an in late July in 2013 were analyzed. The results showed that the activity of the subtropical high had a significant impact on the occurrence of this rainstorm process. During the rainstorm in Yan an, the subtropical high extended westward obviously, and the southerly airflow on the periphery of the subtropical high intersected with cold air in northern Shaanxi. The good coupling of high- and low-level jet stream provided dynamic conditions for the occurrence of downpour. During the rainstorm, the low-level jet stream at 850 hPa was radial, and the high-level jet stream at 200 hPa in this process was in a quasi-horizontal direction. In the rainstorm process, there was an obvious large-value band of water vapor transport, while the water vapor flux arrived at a high latitude, and the intensity was great.