DOI: 10.1007/s00382-016-3309-y
Scopus记录号: 2-s2.0-84982274287
论文题名: Cold season Africa–Asia multidecadal teleconnection pattern and its relation to the Atlantic multidecadal variability
作者: Sun C. ; Li J. ; Ding R. ; Jin Z.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2017
卷: 48, 期: 2017-11-12 起始页码: 3903
结束页码: 3918
语种: 英语
英文关键词: Africa–Asia multidecadal climate variability
; Africa–Asia multidecadal teleconnection pattern
; Atlantic multidecadal variability
; Rossby wave train
英文摘要: A prominent teleconnection pattern of multidecadal variability of cold season (November to April) upper-level atmospheric circulation over North Africa and Eurasia (NA–EA) is revealed by empirical orthogonal function analysis of the Twentieth Century Reanalysis data. This teleconnection pattern is characterized by an eastward propagating wave train with a zonal wavenumber of 5–6 between 20° and 40°N, extending from the northwest coast of Africa to East Asia, and thus is referred to as the Africa–Asia multidecadal teleconnection pattern (AAMT). One-point correlation maps show that the teleconnectivity of AAMT is strong and further demonstrate the existence of the AAMT. The AAMT shapes the spatial structure of multidecadal change in atmospheric circulation over the NA–EA region, and in particular the AAMT pattern and associated fields show similar structures to the change occurring around the early 1960s. A strong in-phase relationship is observed between the AAMT and Atlantic multidecadal variability (AMV) and this connection is mainly due to Rossby wave dynamics. Barotropic modeling results suggest that the upper-level Rossby wave source generated by the AMV can excite the AAMT wave train, and Rossby wave ray tracing analysis further highlights the role of the Asian jet stream in guiding the wave train to East Asia. The AAMT acts as an atmospheric bridge conveying the influence of AMV onto the downstream multidecadal climate variability. The AMV is closely related to the coordinated change in surface and tropospheric air temperatures over Northwest Africa, the Arabian Peninsula and Central China, which may result from the adiabatic expansion/compression of air associated with the AAMT. © 2016, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53202
Appears in Collections: 过去全球变化的重建
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作者单位: College of Global Change and Earth System Science (GCESS), Beijing Normal University, Beijing, China; Joint Center for Global Change Studies, Beijing, China; State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics (LASG), Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Plateau Atmosphere and Environment Key Laboratory of Sichuan Province, Chengdu University of Information Technology, Chengdu, China; Department of Atmospheric Science, Yunnan University, Kunming, China
Recommended Citation:
Sun C.,Li J.,Ding R.,et al. Cold season Africa–Asia multidecadal teleconnection pattern and its relation to the Atlantic multidecadal variability[J]. Climate Dynamics,2017-01-01,48(2017-11-12)