气候变化领域集成服务门户(CCPortal): Effect of upper‐level air temperature changes over the Tibetan Plateau on the genesis frequency of Tibetan Plateau vortices at interannual timescales

CCPortal

DOI	10.1007/s00382-021-05715-x
	Effect of upper‐level air temperature changes over the Tibetan Plateau on the genesis frequency of Tibetan Plateau vortices at interannual timescales
	Li L.; Zhang R.
发表日期	2021
ISSN	0930-7575
起始页码	633
结束页码	652
英文摘要	Tibetan Plateau vortices (TPVs) are important rainfall producers over the Tibetan Plateau in summer and can also influence wide areas east of the Tibetan Plateau when emigrating from the plateau. The Effects of the variations in air temperature over the Tibetan Plateau on the genesis frequency of TPVs at interannual timescales is explored in this work to understand the interannual variations in TPVs and the resultant precipitation. The results indicate that the interannual variations in the genesis frequency of TPVs are significantly related to that in the air temperature at 250 hPa over the Tibetan Plateau. The upper-level air temperature affects the genesis of TPVs by modulating the large-scale circulations at 200 hPa. In warm (cold) years, an anomalous high (low) at 200 hPa is observed over the eastern Tibetan Plateau and central China, and a strong (weak) westerly jet is found north of the Tibetan Plateau. The upper-level westerly jet is considered to have a direct influence on TPVs. Impact of 250-hPa air temperature over the Tibetan Plateau on the westerly jet is further explained from two perspectives. First, the air temperature at 250 hPa regulates the thermal wind between 250 and 200 hPa, thereby affecting the wind at 200 hPa. Second, the air temperature at 250 hPa changes the geopotential height gradient at 200 hPa north of the Tibetan Plateau, which results in variations in the westerly jet there. Consequently, more TPVs are generated over the Tibetan Plateau in warm years, and vice versa for cold years. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Air temperature; Interannual variations; Tibetan Plateau vortices; Westerly jet
来源期刊	Climate Dynamics
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/183496
作者单位	State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing, China; Department of Atmospheric and Oceanic Sciences and Institute of Atmospheric Sciences, Fudan University, Shanghai, China; CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing, China
推荐引用方式 GB/T 7714	Li L.,Zhang R.. Effect of upper‐level air temperature changes over the Tibetan Plateau on the genesis frequency of Tibetan Plateau vortices at interannual timescales[J],2021.
APA	Li L.,&Zhang R..(2021).Effect of upper‐level air temperature changes over the Tibetan Plateau on the genesis frequency of Tibetan Plateau vortices at interannual timescales.Climate Dynamics.
MLA	Li L.,et al."Effect of upper‐level air temperature changes over the Tibetan Plateau on the genesis frequency of Tibetan Plateau vortices at interannual timescales".Climate Dynamics (2021).