DOI: 10.1175/JCLI-D-11-00686.1
Scopus记录号: 2-s2.0-84872936765
论文题名: The relationship of rainfall variability in western equatorial africa to the tropical oceans and atmospheric circulation. Part II: The boreal autumn
作者: Dezfuli A.K. ; Nicholson S.E.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2013
卷: 26, 期: 1 起始页码: 66
结束页码: 84
语种: 英语
Scopus关键词: Atlantic Ocean
; Atmospheric circulation
; Equatorial Africa
; Global tropics
; Indian ocean
; Linear relationships
; Rainfall variability
; Rainy seasons
; Remote forcing
; Sea level pressure
; Sea surface temperatures
; Study areas
; Transition zones
; Tropical ocean
; Zonal wind
; Atmospheric temperature
; Climatology
; Nickel compounds
; Sea level
; Rain
; atmospheric circulation
; El Nino
; La Nina
; rainfall
; sea level pressure
; sea surface temperature
; tropical region
; zonal wind
; Africa
; Indian Ocean
英文摘要: This paper examines the mechanisms controlling the year-to-year variability of rainfall over western equatorial Africa during the rainy season of October-December. Five regions with distinct behavior are analyzed separately. Only two show strong associations with the ocean and atmospheric features in the global tropics. These two regions, in the east (the eastern Zaire basin) and west (Angolan coast) of the study area, respectively, demonstrate strikingly opposite relationships with the anomalies of sea surface temperatures (SSTs), sea level pressure (SLP), and east-west atmospheric circulation. The wet (dry) conditions in the eastern Zaire basin are associated with El Niñ o(La Niñ a)-like phases. The inverse pattern is apparent for the Angolan coast. The other three regions, lying between these two poles of variability, represent a transition zone with a weak linear relationship to the circulation features. The vital impact of the east-west circulation cells on rainfall variability results in a stronger association with zonal wind than with SSTs or SLP. In addition to the zonal shift, changes in intensity of the zonal cells also play a crucial role. Variability in both magnitude and location of the circulation cells appear to be modulated by the remote forcing from the Pacific via an atmospheric bridge. However, the eastern sector is impacted mainly when synchronous changes occur in the Indian Ocean, and the western sector is impacted mainly when synchronous changes occur in the Atlantic Ocean. © 2013 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52066
Appears in Collections: 气候变化事实与影响
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作者单位: Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, MD, United States; Earth, Ocean and Atmospheric Science, The Florida State University, Tallahassee, FL, United States
Recommended Citation:
Dezfuli A.K.,Nicholson S.E.. The relationship of rainfall variability in western equatorial africa to the tropical oceans and atmospheric circulation. Part II: The boreal autumn[J]. Journal of Climate,2013-01-01,26(1)