DOI: 10.1002/2016JD025288
论文题名: A strong phase reversal of the Arctic Oscillation in midwinter 2015/2016: Role of the stratospheric polar vortex and tropospheric blocking
作者: Cheung H.H.N. ; Zhou W. ; Leung M.Y.T. ; Shun C.M. ; Lee S.M. ; Tong H.W.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期: 22 起始页码: 443
结束页码: 457
语种: 英语
英文关键词: Arctic Oscillation
; blocking
; polar vortex
Scopus关键词: air temperature
; air-sea interaction
; anticyclone
; Arctic Oscillation
; atmospheric blocking
; barotropic motion
; El Nino
; phase transition
; polar vortex
; quasi-biennial oscillation
; snowstorm
; stratosphere-troposphere interaction
; subtropical region
; troposphere
; zonal flow
; Asia
; Atlantic Coast [North America]
; Atlantic Coast [United States]
; Atlantic Ocean
; Atlantic Ocean (North)
; United States
英文摘要: In January 2016, Asia and North America experienced unusual cold temperatures, although the global average of surface air temperature broke the warmest record during a strong El Niño event. This was closely related to the remarkable phase transition of the Arctic Oscillation (AO), which can be explained by stratosphere-troposphere interactions. First, the quasi-biennial oscillation changed to its westerly phase in summer 2015 and the stratospheric polar vortex was stronger in early to midwinter 2015/2016. As blocking did not occur in December, the associated downward propagation signal resulted in a strongly positive AO in late December 2015. Second, after late December, the positive phase of Pacific-North America pattern became apparent in El Niño event, which strengthened the Aleutian anticyclone in the stratosphere. In addition, an equivalent barotropic (“blocking”) anticyclone was established in the troposphere over Asia. The coexistence of blocking over Asia and North America characterized the negative AO and a strong zonal wave number 2 pattern. Due to stronger zonal wave number 2 signals from the troposphere, the stronger stratospheric polar vortex was elongated, with two cyclonic centers over Asia and the North Atlantic in January. The resultant southward displacement of polar vortices was followed by rare snowfall in the subtropical region of East Asia and a heavy snowstorm on the East Coast of the United States. ©2016. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62800
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: Guy Carpenter Asia-Pacific Climate Impact Centre, School of Energy and Environment, City University of Hong Kong, Hong Kong SAR, China; Shenzhen Research Institute, City University of Hong Kong, Shenzhen, China; Now at Geophysical Institute, University of Bergen, Bergen, Norway; Hong Kong Observatory, Hong Kong SAR, China
Recommended Citation:
Cheung H.H.N.,Zhou W.,Leung M.Y.T.,et al. A strong phase reversal of the Arctic Oscillation in midwinter 2015/2016: Role of the stratospheric polar vortex and tropospheric blocking[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(22)