DOI: 10.1175/JCLI-D-11-00160.1
Scopus记录号: 2-s2.0-84862074201
论文题名: The southern annular mode seen through weather regimes
作者: Pohl B. ; Fauchereau N.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2012
卷: 25, 期: 9 起始页码: 3336
结束页码: 3354
语种: 英语
Scopus关键词: Anomalies
; Antarctic oscillation
; Climate variability
; Interannual variability
; Intraseasonal variability
; Trends
; Cluster analysis
; Meteorology
; Sea level
; Climate change
; air temperature
; algorithm
; annual variation
; Antarctic Oscillation
; atmospheric circulation
; atmospheric modeling
; climate variation
; seasonal variation
; Southern Hemisphere
; symmetry
; trend analysis
; troposphere
; weather
英文摘要: This article investigates the prominent features of the Southern Hemisphere (south of 20°S) atmospheric circulation when extracted using EOF analysis and a k-means clustering algorithm. The focus is on the southern annular mode (SAM), the nature of its recent trend, and the zonal symmetry of associated spatial patterns. The study uses the NCEP-Department of Energy Atmospheric Model Intercomparison Project II Reanalysis (NCEP-2) (period 1979-2009) to obtain robust patterns over the recent years and the Twentieth Century Reanalysis Project (period 1871-2008) to document decadal changes. Also presented is a comparison of these signals against a station-based reconstruction of the SAM index and a gridded interpolated dataset [Hadley Centre Sea Level Pressure dataset version 2 (HadSLP2)]. Over their common period, both reanalyses are in fair agreement, both in terms of spatial patterns and temporal variability. In particular, both datasets show weather regimes that can be interpreted as the opposite phases of the SAM. At the decadal time scale, the study shows that the trend toward the positive SAM phase (as inferred from the usual EOF-based index) is related more to an increase in the frequency of clusters corresponding to the positive phase, with little changes in the frequency of the negative SAM events. Similarly, the long-term tropospheric warming trend already discussed in the literature is shown to be related more to a decrease in the number of abnormally cold days, with little changes in the number of abnormally warm days. The cluster analysis therefore allows for complement descriptions based on simple indexes or EOF decompositions, highlighting the nonlinear nature of the decadal changes in the Southern Hemisphere atmospheric circulation and temperature. © 2012 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/52422
Appears in Collections: 气候变化事实与影响
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作者单位: Centre de Recherches de Climatologie, UMR6282 Biogéosciences, CNRS/Université de Bourgogne, Dijon, France; Council for Scientific and Industrial Research, Stellenbosh, South Africa; Department of Oceanography, University of Cape Town, Cape Town, South Africa; National Institute for Water and Atmospheric Research, University of Cape Town, Auckland, New Zealand
Recommended Citation:
Pohl B.,Fauchereau N.. The southern annular mode seen through weather regimes[J]. Journal of Climate,2012-01-01,25(9)