DOI: 10.1175/JCLI-D-13-00531.1
Scopus记录号: 2-s2.0-84907588700
论文题名: The anomalous merging of the African and North Atlantic jet streams during the northern hemisphere Winter of 2010
作者: Harnik N. ; Galanti E. ; Martius O. ; Adam O.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2014
卷: 27, 期: 19 起始页码: 7319
结束页码: 7334
语种: 英语
Scopus关键词: Atmosphere-ocean interactions
; Atmospheric circulation
; Interannual variability
; North Atlantic oscillations
; Storm track
; Jets
; air-sea interaction
; annual variation
; atmospheric circulation
; atmospheric structure
; jet stream
; North Atlantic Oscillation
; Northern Hemisphere
; storm track
; temperature anomaly
; temporal variation
; winter
; zonal wind
; Africa
; Atlantic Ocean
; Atlantic Ocean (East)
; Atlantic Ocean (North)
; Pacific Ocean
; Pacific Ocean (North)
; Pacific Ocean (Tropical)
英文摘要: The North Atlantic jet stream during winter 2010 was unusually zonal, so the typically separated Atlantic and African jets were merged into one zonal jet. Moreover, the latitude-height structure and temporal variability of the North Atlantic jet during this winter were more characteristic of the North Pacific. This work examines the possibility of a flow regime change from an eddy-driven to a mixed eddy-thermally driven jet. A monthly jet zonality index is defined, which shows that a persistent merged jet state has occurred in the past, both at the end of the 1960s and during a few sporadic months. The anomalously zonal jet is found to be associated with anomalous tropical Pacific diabatic heating and eddy anomalies similar to those found during a negative North Atlantic Oscillation (NAO) state. A Lagrangian back-trajectory diagnosis of eight winters suggests the tropical Pacific is a source of momentum to the Atlantic and African jets and that this source was stronger during the winter of 2010. The results suggest that the combination of weak eddy variance and fluxes in the North Atlantic, along with strong tropical heating, act to push the jet toward a merged eddy-thermally driven state. The authors also find significant SST anomalies in the North Atlantic, which reinforce the anomalous zonal winds, particularly in the eastern Atlantic. © 2014 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/51329
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Geosciences, Tel Aviv University, Tel Aviv, Israel; Institute of Geography, Oeschger Centre for Climate Change Research, University of Bern, Bern, Switzerland; Department of Earth Sciences, Eidgenössische Technische Hochschule Zurich, Zurich, Switzerland
Recommended Citation:
Harnik N.,Galanti E.,Martius O.,et al. The anomalous merging of the African and North Atlantic jet streams during the northern hemisphere Winter of 2010[J]. Journal of Climate,2014-01-01,27(19)