DOI: 10.1007/s00382-017-3592-2
Scopus记录号: 2-s2.0-85015213600
论文题名: Variability of the extent of the Hadley circulation in the southern hemisphere: a regional perspective
作者: Nguyen H. ; Hendon H.H. ; Lim E.-P. ; Boschat G. ; Maloney E. ; Timbal B.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2018
卷: 50, 期: 2018-01-02 起始页码: 129
结束页码: 142
语种: 英语
Scopus关键词: air-sea interaction
; Hadley cell
; heat source
; La Nina
; meridional circulation
; Rossby wave
; Southern Hemisphere
; Walker circulation
; Africa
; Indian Ocean
; Indian Ocean (Tropical)
; Pacific Ocean
; Pacific Rim
; United States
英文摘要: In order to understand the regional impacts of variations in the extent of the Hadley circulation in the Southern Hemisphere, regional Hadley circulations are defined in three sectors centered on the main tropical heat sources over Africa, Asia-Pacific (Maritime Continent) and the Americas. These regional circulations are defined by computing a streamfunction from the divergent component of the meridional wind. A major finding from this study is that year-to-year variability in the extent of the hemispheric Hadley circulation in the Southern Hemisphere is primarily governed by variations of the extent of the Hadley circulation in the Asia-Pacific sector, especially during austral spring and summer when there is little co-variability with the African sector, and the American sector exhibits an out of phase behavior. An expanded Hadley circulation in the Southern Hemisphere (both hemispherically and in the Asia-Pacific sector) is associated with La Niña conditions and a poleward expansion of the tropical wet zone in the Asia-Pacific sector. While La Niña also promotes expansion in the American and African sectors during austral winter, these tropical conditions tend to promote contraction in the two sectors during austral summer as a result of compensating convergence over the Americas and Africa sectors: a process driven by variations in the Walker circulation and Rossby wave trains emanating from the tropical Indian Ocean. © 2017, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109502
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Bureau of Meteorology, Melbourne, Australia; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States; ARC Centre of Excellence for Climate System Science and School of Earth Sciences, University of Melbourne, Melbourne, Australia
Recommended Citation:
Nguyen H.,Hendon H.H.,Lim E.-P.,et al. Variability of the extent of the Hadley circulation in the southern hemisphere: a regional perspective[J]. Climate Dynamics,2018-01-01,50(2018-01-02)