DOI: 10.1175/JCLI-D-15-0335.1
Scopus记录号: 2-s2.0-84950160787
论文题名: The early 1990s change in ENSO-PSA-SAM relationships and its impact on Southern Hemisphere climate
作者: Yu J.-Y. ; Paek H. ; Saltzman E.S. ; Lee T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2015
卷: 28, 期: 23 起始页码: 9393
结束页码: 9408
语种: 英语
Scopus关键词: Atmospheric pressure
; Atmospheric temperature
; Climate change
; Ice
; Sea ice
; Antarctic oscillation
; Antarctica
; ENSO
; Geographic location
; Interannual variability
; Teleconnections
; Variability
; Climatology
; annual variation
; Antarctic Oscillation
; atmospheric circulation
; climate modeling
; El Nino-Southern Oscillation
; sea ice
; Southern Hemisphere
; teleconnection
; Amundsen Sea
; Antarctica
; Bellingshausen Sea
; East Antarctica
; Pacific Ocean
; Pacific Ocean (Central)
; Pacific Ocean (East)
; Southern Ocean
英文摘要: This study uncovers an early 1990s change in the relationships between El Niño-Southern Oscillation (ENSO) and two leading modes of the Southern Hemisphere (SH) atmospheric variability: the southern annular mode (SAM) and the Pacific-South American (PSA) pattern. During austral spring, while the PSA maintained a strong correlation with ENSO throughout the period 1948-2014, the SAM-ENSO correlation changed from being weak before the early 1990s to being strong afterward. Through the ENSO connection, PSA and SAM became more in-phase correlated after the early 1990s. The early 1990s is also the time when ENSO changed from being dominated by the eastern Pacific (EP) type to being dominated by the central Pacific (CP) type. Analyses show that, while the EP ENSO can excite only the PSA, the CP ENSO can excite both the SAM and PSA through tropospheric and stratospheric pathway mechanisms. The more in-phase relationship between SAM and PSA impacted the post-1990s Antarctic climate in at least two aspects: 1) a stronger Antarctic sea ice dipole structure around the Amundsen-Bellingshausen Seas due to intensified geopotential height anomalies over the region and 2) a shift in the phase relationships of surface air temperature anomalies among East Antarctica, West Antarctica, and the Antarctic Peninsula. These findings imply that ENSO-Antarctic climate relations depend on the dominant ENSO type and that ENSO forcing has become more important to the Antarctic sea ice and surface air temperature variability in the past two decades and will in the coming decades if the dominance of CP ENSO persists. © 2015 American Meteorological Society. 资助项目: Caltech, California Institute of Technology
; JPL, California Institute of Technology
; NASA, California Institute of Technology
; NSF, California Institute of Technology
; NSF, California Institute of Technology
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/50745
Appears in Collections: 气候变化事实与影响
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作者单位: Department of Earth System Science, University of California, Irvine, Irvine, CA, United States; Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, United States
Recommended Citation:
Yu J.-Y.,Paek H.,Saltzman E.S.,et al. The early 1990s change in ENSO-PSA-SAM relationships and its impact on Southern Hemisphere climate[J]. Journal of Climate,2015-01-01,28(23)