DOI: 10.1175/JCLI-D-17-0832.1
Scopus记录号: 2-s2.0-85049743036
论文题名: The influence of the lower stratosphere on ridging atlantic ocean anticyclones over South Africa
作者: Ndarana T. ; Bopape M.-J. ; Waugh D. ; Dyson L.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 15 起始页码: 6175
结束页码: 6187
语种: 英语
英文关键词: Anticyclones
; Stratospheric circulation
; Wave breaking
Scopus关键词: Atmospheric pressure
; Liquid waves
; Anticyclones
; Anticyclonic flow
; Composite analysis
; High pressure system
; Lower stratosphere
; Stratospheric circulations
; Vertical coupling
; Wavebreaking
; Ocean currents
; anticyclone
; Rossby wave
; stratosphere
; troposphere
; wave breaking
; Atlantic Ocean
; Indian Ocean
; South Africa
英文摘要: The link between Rossby wave breaking and ridging Atlantic Ocean anticyclones in the South African domain is examined using NCEP-DOE AMIP-II reanalysis data. A simple composite analysis, which used the duration of ridging events as a basis of averaging, reveals that ridging anticyclones are coupled with Rossby wave breaking at levels higher than the dynamical tropopause. Lower-stratospheric PV anomalies extend to the surface, thus coupling the ridging highs with the lower stratosphere. The anomaly extending from the 70-hPa level to the surface contributes to a southward extension of the surface negative anomaly over the Namibian coast, which induces a cyclonic flow, causing the ridging anticyclone to take a bean-like shape. The surface positive anomaly induces the internal anticyclonic flow within the large-scale pressure system, causing the ridging end to break off and amalgamate with the Indian Ocean high pressure system. Lower-stratospheric Rossby wave breaking lasts for as long as the ridging process, suggesting that the former is critical to the longevity of the latter by maintaining and keeping the vertical coupling intact. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/111414
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geography, Geoinformatics and Meteorology, University of Pretoria, Hatfield, South Africa; South African Weather Service, Pretoria, South Africa; Department of Earth and Planetary Sciences, The Johns Hopkins University, Baltimore, MD, United States
Recommended Citation:
Ndarana T.,Bopape M.-J.,Waugh D.,et al. The influence of the lower stratosphere on ridging atlantic ocean anticyclones over South Africa[J]. Journal of Climate,2018-01-01,31(15)