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DOI | 10.1007/s00382-018-4589-1 |
How do westerly jet streams regulate the winter snow depth over the Tibetan Plateau? | |
Bao, Yuntao1; You, Qinglong1,2 | |
2019-07-01 | |
发表期刊 | CLIMATE DYNAMICS
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ISSN | 0930-7575 |
EISSN | 1432-0894 |
出版年 | 2019 |
卷号 | 53页码:353-370 |
文章类型 | Article |
语种 | 英语 |
国家 | Peoples R China |
英文摘要 | The linkages between upper-level westerly jet streams and snow depth over the Tibetan Plateau (TP) in winter (from November to the following April) were investigated for the period 1979-2014 using satellite-borne passive microwave retrievals of snow depth data and ERA-Interim reanalysis data. Anomalies in atmospheric circulation, temperature, and precipitation corresponding to variation in westerly jets were examined to find the causes of variation in snow depth over the TP, using singular value decomposition, composite analysisand dynamical diagnosis. Results show that variation in intensity and meridional shifts of westerly jets, with particular attention to the North Tibetan Plateau jet (NTPJ) and the South Tibetan Plateau jet (STPJ), significantly influence the interannual variation of snow depth over the TP in late winter (February-April). For the conjunction of intense STPJ and weak NTPJ, an anomalous cold low-pressure vortex is observed over the TP. The vortex extends across the TP and spans from the ground surface to the upper troposphere. There is anomalous ascending motion above the TP due to secondary circulations immediately south and north of STPJ, with increased moisture flux from the southwest. These circulation structures cause significant cooling and increased precipitation, thus promoting snowfall and snow accumulation. Temperature is a more important influence than precipitation on snow accumulation. Cooling over the TP is caused by cold temperature advection due to intensely cold air and weakened descending adiabatic heating due to anomalous ascending motion. Local moisture is reduced, and anomalous ascending moisture advection leads to more netprecipitation and snowfall over the TP. |
英文关键词 | Westerly jet Snow depth Tibetan Plateau Interannual variability Atmospheric circulation |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000471722400021 |
WOS关键词 | INTERANNUAL VARIABILITY ; PRECIPITATION ; TEMPERATURE ; ENSO ; ANOMALIES ; RAINFALL ; COVER ; LEVEL ; ASIA |
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/184376 |
专题 | 气候变化 |
作者单位 | 1.NUIST, Minist Educ KLME Joint Int Res Lab Climate & Envi, Collaborat Innovat Ctr Forecast & Evaluat Meteoro, Key Lab Meteorol Disaster, Nanjing 210044, Jiangsu, Peoples R China; 2.Fudan Univ, Inst Atmospher Sci, Dept Atmospher & Ocean Sci, Shanghai 200438, Peoples R China |
推荐引用方式 GB/T 7714 | Bao, Yuntao,You, Qinglong. How do westerly jet streams regulate the winter snow depth over the Tibetan Plateau?[J]. CLIMATE DYNAMICS,2019,53:353-370. |
APA | Bao, Yuntao,&You, Qinglong.(2019).How do westerly jet streams regulate the winter snow depth over the Tibetan Plateau?.CLIMATE DYNAMICS,53,353-370. |
MLA | Bao, Yuntao,et al."How do westerly jet streams regulate the winter snow depth over the Tibetan Plateau?".CLIMATE DYNAMICS 53(2019):353-370. |
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