气候变化领域集成服务门户(CCPortal): Shallow foehn on the northern leeside of Tianshan Mountains and its influence on atmospheric boundary layer over Urumqi; China

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DOI	10.1016/j.atmosres.2020.104940
	Shallow foehn on the northern leeside of Tianshan Mountains and its influence on atmospheric boundary layer over Urumqi; China — A climatological study
	Li X.; Xia X.; Zhong S.; Luo L.; Yu X.; Jia J.; Zhao K.; Li N.; Liu Y.; Ren Q.
发表日期	2020
ISSN	0169-8095
卷号	240
英文摘要	The climatology of shallow foehn, also known locally as elevated south-easterly gales (ESEGs), on the northern lee side of the central Tianshan Mountains is analysed using radiosonde data recorded over a period of 10 years at Urumqi, the capital of Xinjiang Uygur Autonomous Region in north-western China. ESEGs are a frequent weather phenomenon in the region, occurring on average 128.5 days/yr and most often in winter (47.0 days), particularly January (17.5 days), and least in summer (18 days). The vertical ESEG structures also undergo seasonal variations, with the height of the maximum ESEG wind and the base and top of the ESEG layer more elevated in the warm half (late spring through early fall) of the year than the cold half. However, the monthly mean maximum wind speeds, which vary around 10 m/s, appear to be independent of season. A typical synoptic pattern accompanying ESEGs is characterized by opposite air masses to the east (cold) and west (warm) of Xinjiang. A strong low-level west-east pressure gradient helps push cold air to enter Xinjiang from the east, which subsequently induces a north-south pressure gradient across the Tianshan Mountains. This regional pressure gradient combined with terrain channelling leads to the development of ESEGs. A comparison of boundary layer structure between days with/without ESEGs in winter shows that the ESEG days are accompanied by deeper (average of 900 m) and more intense (average 6 °C) inversion, but there is little difference in the cold air pool Froude Number between the two types of days. © 2020 Elsevier B.V.
英文关键词	Complex terrain flows; Gap winds; Low-level jets; Orographic flows; Shallow foehn; Terrain channelling
语种	英语
scopus关键词	Atmospheric movements; Landforms; Pressure gradient; Complex terrains; Gap winds; Low level jet; Orographic flow; Shallow foehn; Terrain channelling; Atmospheric boundary layer; boundary layer; climatology; cold air; complex terrain; foehn; jet stream; orography; radiosonde; seasonal variation; China; Tien Shan; Urumqi; Xinjiang Uygur
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/141941
作者单位	Institute of Desert Meteorology, China Meteorological Administration, Urumqi, China; LAGEO, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; College of Earth Sciences, University of Chinese Academy of Sciences, Beijing, China; Collaborative Innovation Centre on Forecast and Evaluation of Meteorological Disasters, Nanjing University of Information Science & Technology, Nanjing, China; Department of Geography, Environment and Spatial Sciences, Michigan State University, East Lansing, MI, United States; LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Urumqi Meteorological Bureau, Urumqi, Xinjiang, China; Xinjiang Meteorological Observatory, Urumqi, Xinjiang, China
推荐引用方式 GB/T 7714	Li X.,Xia X.,Zhong S.,等. Shallow foehn on the northern leeside of Tianshan Mountains and its influence on atmospheric boundary layer over Urumqi; China — A climatological study[J],2020,240.
APA	Li X..,Xia X..,Zhong S..,Luo L..,Yu X..,...&Ren Q..(2020).Shallow foehn on the northern leeside of Tianshan Mountains and its influence on atmospheric boundary layer over Urumqi; China — A climatological study.Atmospheric Research,240.
MLA	Li X.,et al."Shallow foehn on the northern leeside of Tianshan Mountains and its influence on atmospheric boundary layer over Urumqi; China — A climatological study".Atmospheric Research 240(2020).