IEECAS OpenIR  > 黄土与第四纪地质国家重点实验室(2010~)
Intraseasonal variability of winter precipitation over central asia and the western tibetan plateau from 1979 to 2013 and its relationship with the North Atlantic Oscillation
Liu, Heng1,2; Liu, Xiaodong1,2,3; Dong, Buwen4
2017-09-01
Source PublicationDYNAMICS OF ATMOSPHERES AND OCEANS
Volume79Issue:2017Pages:31-42
SubtypeArticle
AbstractWinter precipitation over Central Asia and the western Tibetan Plateau (CAWTP) is mainly a result of the interaction between the westerly circulation and the high mountains around the plateau. Empirical Orthogonal Functions (EOFs), Singular Value Decomposition (SVD), linear regression and composite analysis were used to analyze winter daily precipitation and other meteorological elements in this region from 1979 to 2013, in order to understand how interactions between the regional circulation and topography affect the intraseasonal variability in precipitation. The SVD analysis shows that the winter daily precipitation variability distribution is characterized by a dipole pattern with opposite signs over the northern Pamir Plateau and over the Karakoram Himalaya, similar to the second mode of EOF analysis. This dipole pattern of precipitation anomaly is associated with local anomalies in both the 700 hPa moisture transport and the 500 hPa geopotential height and is probably caused by oscillations in the regional and large-scale circulations, which can influence the westerly disturbance tracks and water vapor transport. The linear regression shows that the anomalous mid-tropospheric circulation over CAWTP corresponds to an anti-phase variation of the 500 hPa geopotential height anomalies over the southern and northern North Atlantic 10 days earlier (at 95% significance level), that bears a similarity to the North Atlantic Oscillation (NAO). The composite analysis reveals that the NAO impacts the downstream regions including CAWTP by controlling south-north two branches of the middle latitude westerly circulation around the Eurasian border. During the positive phases of the NAO, the northern branch of the westerly circulation goes around the northwest Tibetan Plateau, whereas the southern branch encounters the southwest Tibetan Plateau, which leads to reduced precipitation over the northern Pamir Plateau and increased precipitation over the Karakoram Himalaya, and vice versa. (C) 2017 Elsevier B.V. All rights reserved.
KeywordTopographic Precipitation North Atlantic Oscillation Westerly Circulation Statistical Analysis Intraseasonal Variability
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1016/j.dynatmoce.2017.07.001
WOS KeywordCLIMATE MODEL SIMULATION ; CENTRAL-SOUTHWEST ASIA ; INTERANNUAL VARIABILITY ; EAST-ASIA ; TEMPERATURE ; SEASONALITY ; REANALYSIS ; REGION ; NAO
Indexed BySCI
Language英语
WOS Research AreaGeochemistry & Geophysics ; Meteorology & Atmospheric Sciences ; Oceanography
WOS SubjectGeochemistry & Geophysics ; Meteorology & Atmospheric Sciences ; Oceanography
WOS IDWOS:000412038400003
Citation statistics
Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.ieecas.cn/handle/361006/5419
Collection黄土与第四纪地质国家重点实验室(2010~)
Affiliation1.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Xian 710061, Shaanxi, Peoples R China
2.Univ Chinese Acad Sci, Coll Earth Sci, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
4.Univ Reading, Natl Ctr Atmospher Sci, Reading RG6 6BB, Berks, England
Recommended Citation
GB/T 7714
Liu, Heng,Liu, Xiaodong,Dong, Buwen. Intraseasonal variability of winter precipitation over central asia and the western tibetan plateau from 1979 to 2013 and its relationship with the North Atlantic Oscillation[J]. DYNAMICS OF ATMOSPHERES AND OCEANS,2017,79(2017):31-42.
APA Liu, Heng,Liu, Xiaodong,&Dong, Buwen.(2017).Intraseasonal variability of winter precipitation over central asia and the western tibetan plateau from 1979 to 2013 and its relationship with the North Atlantic Oscillation.DYNAMICS OF ATMOSPHERES AND OCEANS,79(2017),31-42.
MLA Liu, Heng,et al."Intraseasonal variability of winter precipitation over central asia and the western tibetan plateau from 1979 to 2013 and its relationship with the North Atlantic Oscillation".DYNAMICS OF ATMOSPHERES AND OCEANS 79.2017(2017):31-42.
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