气候变化领域集成服务门户(CCPortal): Thermodynamic controls of the Western Tibetan Vortex on Tibetan air temperature

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DOI	10.1007/s00382-019-04785-2
	Thermodynamic controls of the Western Tibetan Vortex on Tibetan air temperature
	Li X.-F.; Fowler H.J.; Yu J.; Forsythe N.; Blenkinsop S.; Pritchard D.
发表日期	2019
ISSN	0930-7575
起始页码	4267
结束页码	4290
卷号	53 期号:2020-07-08
英文摘要	The “Western Tibetan Vortex” (WTV)—also termed the Karakoram Vortex—dominates the middle-to-lower troposphere and the near-surface air temperature variability above the western Tibetan Plateau (TP). Here, we explore the thermodynamic mechanisms through which the WTV modulates air temperature over the western TP by diagnosing the three major terms of the thermodynamic energy equation—adiabatic heating, horizontal temperature advection, and diabatic heating—that maintain the atmospheric thermal balance. We composite these major terms to examine the differences between anti-cyclonic and cyclonic WTV events. Our theoretical approach demonstrates that adiabatic sinking-compression (rising-expansion) provides the overwhelming control on both the middle-to-lower tropospheric and lower stratospheric temperature increases (decreases) under anti-cyclonic (cyclonic) WTV conditions over the western TP high mountain area in all four seasons. This also explains the mechanisms behind the anomalous temperature “dipole” found between the mid-lower troposphere and lower stratosphere when the WTV was initially identified. Spatially, adiabatic heating effects are centred on the central western TP in summer and the south slope centring at 70°–80°E of the TP in other seasons. The other two terms, horizontal temperature advection and diabatic heating, have localized importance over the edges of the western TP. In a case study over the Karakoram area, we further demonstrate that adiabatic heating (rising-expanding-cooling/sinking-compressing-warming) is the dominant thermodynamic process controlling Karakoram air temperatures under WTV variability, except for at the very near surface in autumn and winter. Our analysis methods can be applied to investigate the thermodynamic processes of other atmospheric circulation systems or climate variability modes. © 2019, The Author(s).
英文关键词	Adiabatic heating; Karakoram vortex; Subtropical westerly Jet; Thermal energy balance; Thermodynamic energy equation; Western Tibetan Vortex
语种	英语
scopus关键词	adiabatic process; air temperature; atmospheric circulation; energy balance; heating; jet; seasonal variation; subtropical region; thermodynamics; vortex; westerly; China; Qinghai-Xizang Plateau; Wound tumor virus
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/145974
作者单位	School of Engineering, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom
推荐引用方式 GB/T 7714	Li X.-F.,Fowler H.J.,Yu J.,et al. Thermodynamic controls of the Western Tibetan Vortex on Tibetan air temperature[J],2019,53(2020-07-08).
APA	Li X.-F.,Fowler H.J.,Yu J.,Forsythe N.,Blenkinsop S.,&Pritchard D..(2019).Thermodynamic controls of the Western Tibetan Vortex on Tibetan air temperature.Climate Dynamics,53(2020-07-08).
MLA	Li X.-F.,et al."Thermodynamic controls of the Western Tibetan Vortex on Tibetan air temperature".Climate Dynamics 53.2020-07-08(2019).