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

doi:10.1016/j.dynatmoce.2017.07.001

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, Heng 1,2; Liu, Xiaodong 1,2,3; Dong, Buwen 4
	2017-09-01
发表期刊	DYNAMICS OF ATMOSPHERES AND OCEANS
卷号	79 期号:2017 页码:31-42
文章类型	Article
摘要	Winter 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.
关键词	Topographic Precipitation North Atlantic Oscillation Westerly Circulation Statistical Analysis Intraseasonal Variability
WOS标题词	Science & Technology ; Physical Sciences
DOI	10.1016/j.dynatmoce.2017.07.001
关键词[WOS]	CLIMATE MODEL SIMULATION ; CENTRAL-SOUTHWEST ASIA ; INTERANNUAL VARIABILITY ; EAST-ASIA ; TEMPERATURE ; SEASONALITY ; REANALYSIS ; REGION ; NAO
收录类别	SCI
语种	英语
WOS研究方向	Geochemistry & Geophysics ; Meteorology & Atmospheric Sciences ; Oceanography
WOS类目	Geochemistry & Geophysics ; Meteorology & Atmospheric Sciences ; Oceanography
WOS记录号	WOS:000412038400003
引用统计	被引频次：18[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.ieecas.cn/handle/361006/5419
专题	黄土与第四纪地质国家重点实验室（2010~）
作者单位	1.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
推荐引用方式 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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