干旱区生态环境知识资源中心(Arid): Circulations and Thermodynamic Characteristics of Different Patterns of Rainstorm Processes in the Eastern Foot of Helan Mountain

Arid

DOI	10.46267/j.1006-8775.2022.026
	Circulations and Thermodynamic Characteristics of Different Patterns of Rainstorm Processes in the Eastern Foot of Helan Mountain
	Chen, Yu-ying; Li, Jian-ping; Zhang, Su-zhao; SU, Yang; Yang, Yin; Zhang, Yi-xing; Yao, Shan-shan
通讯作者	Chen, YY
来源期刊	JOURNAL OF TROPICAL METEOROLOGY
ISSN	1006-8775
出版年	2022
卷号	28 期号:3 页码:343-363
英文摘要	Based on the observational hourly precipitation data and the European Centre for Medium-Range Weather Forecasts (ECMWF) Reanalysis 5 (ERA5) products from 2006 to 2020, 22 rainstorm processes in the eastern foot of Helan Mountain are objectively classified by using the hierarchical clustering method, and the circulation characteristics of different patterns are comparatively analyzed in this study. The results show that the occurrences of rainstorm processes in the eastern foot of Helan Mountain are most closely related to three circulation patterns. Patterns I and III mainly occur in July and August, with similar zonal circulations in synoptic backgrounds. Specifically, the South Asia high and the western Pacific subtropical high are stronger and more northward than those in normal years. The frontal systems in westerlies are inactive, while the water vapor from the ocean surface in the south is mainly transported to the rainstorm area by the southerly jet stream at 700 hPa. The dynamic lifting anomalies are relatively weak, the instability of atmospheric stratification is anomalously strong, and thus the localized severe convective rainstorm is more significant. Comparatively, rainstorm processes of pattern I are accompanied by stronger and deeper ascending motions, and the warm-sector rainstorm is more extreme. Pattern III shows a stronger and deeper convective instability, accompanied by larger low-level moisture. Rainstorm processes of pattern II mainly occur in early summer and early autumn, presenting a meridional circulation pattern of high in the east and low in the west in terms of geopotential height. Moreover, the two low-level jets transporting the water vapor northward from the ocean on the east of China encounter with the frontal systems in westerlies, which makes the ascending motion in pattern II anomalously strong and deep. The relatively weak instability of atmospheric stratification causes weak convection and long-lasting precipitation formed by the confluence of cold air and warm air. This study may help improve rainstorm forecasting in arid regions.
英文关键词	eastern foot of Helan Mountain rainstorm hierarchical clustering objective classification circulation characteristics
类型	Article
语种	英语
收录类别	SCI-E
WOS记录号	WOS:000859386000007
WOS关键词	DAILY RAINFALL PATTERNS ; LARGE-SCALE ; MEDITERRANEAN AREA ; CLASSIFICATION ; PRECIPITATION ; THUNDERSTORMS ; STORMS
WOS类目	Meteorology & Atmospheric Sciences
WOS研究方向	Meteorology & Atmospheric Sciences
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/393625
推荐引用方式 GB/T 7714	Chen, Yu-ying,Li, Jian-ping,Zhang, Su-zhao,et al. Circulations and Thermodynamic Characteristics of Different Patterns of Rainstorm Processes in the Eastern Foot of Helan Mountain[J],2022,28(3):343-363.
APA	Chen, Yu-ying.,Li, Jian-ping.,Zhang, Su-zhao.,SU, Yang.,Yang, Yin.,...&Yao, Shan-shan.(2022).Circulations and Thermodynamic Characteristics of Different Patterns of Rainstorm Processes in the Eastern Foot of Helan Mountain.JOURNAL OF TROPICAL METEOROLOGY,28(3),343-363.
MLA	Chen, Yu-ying,et al."Circulations and Thermodynamic Characteristics of Different Patterns of Rainstorm Processes in the Eastern Foot of Helan Mountain".JOURNAL OF TROPICAL METEOROLOGY 28.3(2022):343-363.