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DOI | 10.1007/s00382-019-04785-2 |
Thermodynamic controls of the Western Tibetan Vortex on Tibetan air temperature | |
Li, Xiao-Feng; Fowler, Hayley J.; Yu, Jingjing; Forsythe, Nathan; Blenkinsop, Stephen; Pritchard, David | |
2019-10-01 | |
发表期刊 | CLIMATE DYNAMICS |
ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 53页码:4267-4290 |
文章类型 | Article |
语种 | 英语 |
国家 | England |
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 degrees-80 degrees 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. |
英文关键词 | Western Tibetan Vortex Karakoram vortex Subtropical westerly Jet Adiabatic heating Thermal energy balance Thermodynamic energy equation |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000489753900031 |
WOS关键词 | KARAKORAM ; CIRCULATION ; GLACIERS ; BALANCE |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/187220 |
专题 | 气候变化 |
作者单位 | Newcastle Univ, Sch Engn, Newcastle Upon Tyne NE1 7RU, Tyne & Wear, England |
推荐引用方式 GB/T 7714 | Li, Xiao-Feng,Fowler, Hayley J.,Yu, Jingjing,et al. Thermodynamic controls of the Western Tibetan Vortex on Tibetan air temperature[J]. CLIMATE DYNAMICS,2019,53:4267-4290. |
APA | Li, Xiao-Feng,Fowler, Hayley J.,Yu, Jingjing,Forsythe, Nathan,Blenkinsop, Stephen,&Pritchard, David.(2019).Thermodynamic controls of the Western Tibetan Vortex on Tibetan air temperature.CLIMATE DYNAMICS,53,4267-4290. |
MLA | Li, Xiao-Feng,et al."Thermodynamic controls of the Western Tibetan Vortex on Tibetan air temperature".CLIMATE DYNAMICS 53(2019):4267-4290. |
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