DOI: 10.1007/s00382-015-2551-z
Scopus记录号: 2-s2.0-84947485675
论文题名: Connection between weak stratospheric vortex events and the Pacific Decadal Oscillation
作者: Woo S.-H. ; Sung M.-K. ; Son S.-W. ; Kug J.-S.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2015
卷: 45, 期: 2017-11-12 起始页码: 3481
结束页码: 3492
语种: 英语
英文关键词: PDO
; Troposphere–stratosphere interaction
; Weak stratospheric vortex events
英文摘要: We investigate the possible impacts of the Pacific Decadal Oscillation (PDO) on the occurrence of weak stratospheric polar vortex (WSV) events in the Northern Hemisphere winter. WSV events, which are defined when polar-cap geopotential height anomalies at 50 hPa fall below the 10th percentile in winter, are observed more frequently during positive PDO phases than during negative PDO phases. Additionally, tropospheric wave forcings that drive WSV events are remarkably different between the two phases of the PDO. During the positive PDO phase, the vertical propagation of wavenumber-one waves plays a predominant role with a rather minor contribution of wavenumber-two waves. This contrasts with the negative PDO phase when the WSV events are primarily caused by wavenumber-two waves. This difference is partly related to the PDO-induced tropospheric circulation anomalies over the North Pacific whose zonal wavenumber-one component constructively (destructively) interferes with climatological planetary-scale waves during positive (negative) PDO winters. The predominant wavenumber-two wave forcings during the negative PDO phase are likely related to the enhanced tropospheric eddy activity over Alaska that results from the poleward shift of the Pacific jet in response to the negative PDO. © 2015, Springer-Verlag Berlin Heidelberg. 资助项目: NRF, Korea Polar Research Institute
; KOPRI, Korea Polar Research Institute
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53919
Appears in Collections: 过去全球变化的重建
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作者单位: School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Gyungbuk, South Korea; Division of Climate Change, Korea Polar Research Institute, Incheon, South Korea; School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea
Recommended Citation:
Woo S.-H.,Sung M.-K.,Son S.-W.,et al. Connection between weak stratospheric vortex events and the Pacific Decadal Oscillation[J]. Climate Dynamics,2015-01-01,45(2017-11-12)