DOI: 10.1175/JCLI-D-15-0226.1
Scopus记录号: 2-s2.0-84962279044
论文题名: Forced atmospheric teleconnections during 1979-2014
作者: Zhang T. ; Hoerling M.P. ; Perlwitz J. ; Xu T.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2016
卷: 29, 期: 7 起始页码: 2333
结束页码: 2357
语种: 英语
Scopus关键词: Atmospheric pressure
; Atmospheric radiation
; Atmospheric temperature
; Atmospheric thermodynamics
; Carbon
; Carbon dioxide
; Climate change
; Climate models
; Earth atmosphere
; Nickel
; Oceanography
; Orthogonal functions
; Principal component analysis
; Sea ice
; Surface waters
; Tropics
; Atmosphere-ocean interactions
; Atmospheric circulation
; Climate variability
; ENSO
; Variability
; Climatology
; air-sea interaction
; atmospheric circulation
; atmospheric dynamics
; atmospheric general circulation model
; climate variation
; El Nino-Southern Oscillation
; teleconnection
; North America
; Pacific Ocean
英文摘要: Forced atmospheric teleconnections during 1979-2014 are examined using a 50-member ensemble of atmospheric general circulation model (AGCM) simulations subjected to observed variations in sea surface temperatures (SSTs), sea ice, and carbon dioxide. Three primary modes of forced variability are identified using empirical orthogonal function (EOF) analysis of the ensemble mean wintertime extratropical Northern Hemisphere 500-hPa heights. The principal component time series of the first and second modes are highly correlated with Niño-3.4 and trans-Niño (TNI) SST indices, respectively, indicating mostly tropical sources. Their impacts are largely confined to the Pacific-North American (PNA) sector. The leading mode describes the canonical atmospheric teleconnection associated with El Niño-Southern Oscillation (ENSO) resembling the tropical/Northern Hemisphere pattern. The second mode describes a wave train resembling the classic PNA pattern resulting from atmospheric sensitivity to ENSO asymmetry and from sensitivity to a tropical precursor SST for ENSO development. The third mode is characterized by a hemisphere-scale increasing trend in heights. Based on a comparison with 50-member coupled ocean-atmosphere model simulations, it is argued that this mode is strongly related to radiatively forced climate change, while the other two forced teleconnections are principally related to internal coupled variability. A trend in the leading forced mode is related to ENSO-like decadal variability and dominates the overall observed 500-hPa height trend since 1979. These model results indicate that the trend in the first mode is due to internal variability rather than external radiative forcing. © 2016 American Meteorological Society. 资助项目: NOAA, National Oceanic and Atmospheric Administration
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49971
Appears in Collections: 气候变化事实与影响
There are no files associated with this item.
作者单位: Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO, United States; Physical Sciences Division, NOAA/Earth System Research Laboratory, Boulder, CO, United States
Recommended Citation:
Zhang T.,Hoerling M.P.,Perlwitz J.,et al. Forced atmospheric teleconnections during 1979-2014[J]. Journal of Climate,2016-01-01,29(7)