DOI: 10.1007/s00382-013-1844-3
Scopus记录号: 2-s2.0-84895017808
论文题名: High and low latitude types of the downstream influences of the North Atlantic Oscillation
作者: Song J. ; Li C. ; Zhou W.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2014
卷: 42, 期: 2017-03-04 起始页码: 1097
结束页码: 1111
语种: 英语
英文关键词: Asian jet waveguide
; Downstream influence
; ENSO
; North Atlantic Oscillation
; Reflective wave
英文摘要: Using reanalysis data, we find that the downstream-propagating quasi-stationary Rossby wave train associated with the North Atlantic Oscillation (NAO) generally propagates along a high (low)-latitude pathway during warm (cold) El Niño-Southern Oscillation (ENSO) boreal winters. Consistent with the different propagation directions of the NAO-related downstream wave train, during the warm (cold) ENSO winters, the NAO is associated with significant 300 hPa geopotential height anomalies over eastern Siberia (the Arabian Sea, the east coast of Asia at around 40°N, and the North Pacific), and the near-surface air temperature perturbations associated with the NAO over the high latitudes of Asia are relatively strong (weak). Based on these differences, we argue that the NAO has two distinct types of downstream influence: a high-latitude type and a low-latitude type. Furthermore, we argue that the two types of NAO's downstream influence are modulated by the intensity of the subtropical potential vorticity (PV) meridional gradient over Africa. When this gradient is weak (strong), as in the warm (cold) ENSO winters, the NAO's downstream influence tends to be of the high (low)-latitude type. These results are further supported by analysis of intraseasonal NAO events. We separate NAO events into two categories in terms of the intensity of the subtropical PV gradient over Africa. Composites of the NAO events accompanied by a weak (strong) subtropical PV gradient show that the NAO-related downstream wave train tends to propagate along a high (low)-latitude pathway. © 2013 The Author(s). 资助项目: NSFC, National Natural Science Foundation of China
; NSFC, National Natural Science Foundation of China
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/54308
Appears in Collections: 过去全球变化的重建
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作者单位: LASG, Institute of Atmospheric Physics (IAP), Chinese Academy of Sciences, P. O. BOX 9804, Beijing, 100029, China; Guy Carpenter Asia-Pacific Climate Impact Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong, China
Recommended Citation:
Song J.,Li C.,Zhou W.. High and low latitude types of the downstream influences of the North Atlantic Oscillation[J]. Climate Dynamics,2014-01-01,42(2017-03-04)