DOI: 10.1175/JCLI-D-18-0168.1
Scopus记录号: 2-s2.0-85054068499
论文题名: Modeled and observed multidecadal variability in the North Atlantic jet stream and its connection to sea surface temperatures
作者: Simpson I.R. ; Deser C. ; McKinnon K.A. ; Barnes E.A.
刊名: Journal of Climate
ISSN: 8948755
出版年: 2018
卷: 31, 期: 20 起始页码: 8313
结束页码: 8338
语种: 英语
英文关键词: Atmosphere-ocean interaction
; Atmospheric circulation
; Climate models
; Climate variability
; Multidecadal variability
; North Atlantic Oscillation
Scopus关键词: Atmospheric pressure
; Atmospheric temperature
; Atmospheric thermodynamics
; Climate models
; Climatology
; Submarine geophysics
; Surface properties
; Surface waters
; White noise
; Atmosphere-ocean interactions
; Atmospheric circulation
; Climate variability
; Multidecadal variability
; North Atlantic oscillations
; Oceanography
英文摘要: Multidecadal variability in the North Atlantic jet stream in general circulation models (GCMs) is compared with that in reanalysis products of the twentieth century. It is found that almost all models exhibit multidecadal jet stream variability that is entirely consistent with the sampling of white noise year-to-year atmospheric fluctuations. In the observed record, the variability displays a pronounced seasonality within the winter months, with greatly enhanced variability toward the late winter. This late winter variability exceeds that found in any GCM and greatly exceeds expectations from the sampling of atmospheric noise, motivating the need for an underlying explanation. The potential roles of both external forcings and internal coupled ocean-atmosphere processes are considered. While the late winter variability is not found to be closely connected with external forcing, it is found to be strongly related to the internally generated component of Atlantic multidecadal variability (AMV) in sea surface temperatures (SSTs). In fact, consideration of the seasonality of the jet stream variability within the winter months reveals that the AMV is far more strongly connected to jet stream variability during March than the early winter months or the winter season as a whole. Reasoning is put forward for why this connection likely represents a driving of the jet stream variability by the SSTs, although the dynamics involved remain to be understood. This analysis reveals a fundamental mismatch between late winter jet stream variability in observations and GCMs and a potential source of long-term predictability of the late winter Atlantic atmospheric circulation. © 2018 American Meteorological Society. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110648
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Climate and Global Dynamics Laboratory, National Center for Atmospheric Research, Boulder, CO, United States; Descartes Labs, Santa Fe, NM, United States; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
Recommended Citation:
Simpson I.R.,Deser C.,McKinnon K.A.,et al. Modeled and observed multidecadal variability in the North Atlantic jet stream and its connection to sea surface temperatures[J]. Journal of Climate,2018-01-01,31(20)