DOI: 10.1175/JCLI-D-15-0350.1
Scopus记录号: 2-s2.0-84960897449
论文题名: The positive North Atlantic Oscillation with downstream blocking and Middle East snowstorms: Impacts of the North Atlantic jet
作者: Yao Y. ; Luo D. ; Dai A. ; Feldstein S.B.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 5 起始页码: 1853
结束页码: 1876
语种: 英语
Scopus关键词: Atmospheric pressure
; Dynamics
; Fighter aircraft
; Jets
; Lasers
; Masers
; Temperature
; Blocking
; Composite analysis
; Extreme events
; Multiscale interactions
; Negative temperatures
; North Atlantic oscillations
; South Eastern Europe
; Variability
; Oceanography
; advection
; atmospheric blocking
; atmospheric dynamics
; extreme event
; jet
; North Atlantic Oscillation
; snowstorm
; temperature anomaly
; Europe
; Middle East
英文摘要: A recent study revealed that cold winter outbreaks over the Middle East and southeastern Europe are caused mainly by the northeast-southwest (NE-SW) tilting of European blocking (EB) associated with the positive-phase North Atlantic Oscillation (NAO+). Here, the North Atlantic conditions are examined that determine the EB tilting direction, defined as being perpendicular to the dipole anomaly orientation. Using daily reanalysis data, the NAO+ events are classified into strong (SJN) and weak (WJN) North Atlantic jet types. A composite analysis shows that the EB is generally stronger and located more westward and southward during SJN events than during WJN events. During SJN events, the NAO+ and EB dipoles exhibit NE-SW tilting, which leads to strong cold advection and large negative temperature anomalies over the Middle East and southeastern Europe. In contrast, northwest-southeast (NW-SE) tilting without strong negative temperature anomalies over the Middle East is seen during WJN events. A nonlinear multiscale interaction model is modified to investigate the physical mechanism through which the North Atlantic jet (NAJ) affects EB with the NAO+ event. It is shown that, when the NAJ is stronger, an amplified EB event forms because of enhanced NAO+ energy dispersion. For a strong (weak) NAJ, the EB tends to occur in a relatively low-latitude (high latitude) region because of the suppressive (favorable) role of intensified (reduced) zonal wind in high latitudes. It exhibits NE-SW (NW-SE) tilting because the blocking region corresponds to negative-over-positive (opposite) zonal wind anomalies. The results suggest that the NAJ can modulate the tilting direction of EB, leading to different effects over the Middle East. © 2016 American Meteorological Society. 资助项目: NSF, National Science Foundation
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50188
Appears in Collections: 气候变化事实与影响
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作者单位: Key Laboratory of Regional Climate-Environment for Temperate East Asia, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China; Qingdao Collaborative Innovation Center of Marine Science and Technology, Physical Oceanography Laboratory, Ocean University of China, Qingdao, China; Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, Albany, NY, United States; National Center for Atmospheric Research, Boulder, CO, United States; Department of Meteorology, The Pennsylvania State University, University Park, PA, United States
Recommended Citation:
Yao Y.,Luo D.,Dai A.,et al. The positive North Atlantic Oscillation with downstream blocking and Middle East snowstorms: Impacts of the North Atlantic jet[J]. Journal of Climate,2016-01-01,29(5)