气候变化领域集成服务门户(CCPortal): Large-scale backgrounds and crucial factors modulating the eastward moving speed of vortices moving off the Tibetan Plateau

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DOI	10.1007/s00382-019-04724-1
	Large-scale backgrounds and crucial factors modulating the eastward moving speed of vortices moving off the Tibetan Plateau
	Li L.; Zhang R.; Wen M.
发表日期	2019
ISSN	0930-7575
起始页码	1711
结束页码	1722
卷号	53 期号:2020-03-04
英文摘要	Tibetan Plateau vortices (TPVs) are major rain producer over the Tibetan Plateau, which trigger heavy rainfall in southwestern and eastern China when moving off the plateau. In this work, two groups of TPVs moving off the plateau are selected according to their eastward moving speeds. The features of the atmospheric dynamic and thermodynamic fields associated with the two groups of TPVs are compared, based on the final (FNL) operational global analysis data from the Global Forecasting System of the National Centers for Environment Prediction (NCEP). The results show that the large-scale circulations and heating fields have a close relationship with the moving speed of the TPVs. The TPVs move eastward faster when wider and stronger convergence at 500 hPa, divergence at 200 hPa and the related ascending motion are observed to the east of TPVs. In addition, the stronger and further eastward stretching unstable stratification and water vapor convergence, as well as the more intensive heating field above 500 hPa to the east of TPVs, correspond to larger eastward moving speed of TPVs. Furthermore, the crucial factors modulating the moving speed of TPVs are explored through potential vorticity (PV) budget analyses, in which the physical variables are partitioned into zonal means and disturbances. The convergence of the mean zonal winds and disturbance winds at 500 hPa, as well as the vertical distribution of disturbance heating to the east of TPVs are the crucial factors influencing the eastward moving speed of TPVs, among which the vertical distribution of disturbance heating is the most dominant. © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Large-scale circulations; PV tendency equation; Thermodynamic fields; Tibetan Plateau vortices
语种	英语
scopus关键词	atmospheric circulation; atmospheric dynamics; flow velocity; heating; potential vorticity; vertical distribution; vortex; zonal wind; China; Qinghai-Xizang Plateau
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/146133
作者单位	State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, #46, Zhong-Guan-Cun South Avenue, Beijing, 100081, China; 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.,Wen M.. Large-scale backgrounds and crucial factors modulating the eastward moving speed of vortices moving off the Tibetan Plateau[J],2019,53(2020-03-04).
APA	Li L.,Zhang R.,&Wen M..(2019).Large-scale backgrounds and crucial factors modulating the eastward moving speed of vortices moving off the Tibetan Plateau.Climate Dynamics,53(2020-03-04).
MLA	Li L.,et al."Large-scale backgrounds and crucial factors modulating the eastward moving speed of vortices moving off the Tibetan Plateau".Climate Dynamics 53.2020-03-04(2019).