DOI: 10.1007/s00382-015-2654-6
Scopus记录号: 2-s2.0-84959156881
论文题名: Troposphere–stratosphere response to large-scale North Atlantic Ocean variability in an atmosphere/ocean coupled model
作者: Omrani N.-E. ; Bader J. ; Keenlyside N.S. ; Manzini E.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 46, 期: 2017-05-06 起始页码: 1397
结束页码: 1415
语种: 英语
英文关键词: Atlantic multidecadal oscillation (AMO)
; Atlantic multidecadal variability (AMV)
; North Atlantic oscillation (NAO)
; North Atlantic variability (NAV)
; Northern annular mode (NAM)
; Ocean–atmosphere interaction
; Stratosphere/troposphere coupling
英文摘要: The instrumental records indicate that the basin-wide wintertime North Atlantic warm conditions are accompanied by a pattern resembling negative North Atlantic oscillation (NAO), and cold conditions with pattern resembling the positive NAO. This relation is well reproduced in a control simulation by the stratosphere resolving atmosphere–ocean coupled Max-Planck-Institute Earth System Model (MPI-ESM). Further analyses of the MPI-ESM model simulation shows that the large-scale warm North Atlantic conditions are associated with a stratospheric precursory signal that propagates down into the troposphere, preceding the wintertime negative NAO. Additional experiments using only the atmospheric component of MPI-ESM (ECHAM6) indicate that these stratospheric and tropospheric changes are forced by the warm North Atlantic conditions. The basin-wide warming excites a wave-induced stratospheric vortex weakening, stratosphere/troposphere coupling and a high-latitude tropospheric warming. The induced high-latitude tropospheric warming is associated with reduction of the growth rate of low-level baroclinic waves over the North Atlantic region, contributing to the negative NAO pattern. For the cold North Atlantic conditions, the strengthening of the westerlies in the coupled model is confined to the troposphere and lower stratosphere. Comparing the coupled and uncoupled model shows that in the cold phase the tropospheric changes seen in the coupled model are not well reproduced by the standalone atmospheric configuration. Our experiments provide further evidence that North Atlantic Ocean variability (NAV) impacts the coupled stratosphere/troposphere system. As NAV has been shown to be predictable on seasonal-to-decadal timescales, these results have important implications for the predictability of the extra-tropical atmospheric circulation on these time-scales. © 2015, Springer-Verlag Berlin Heidelberg. 资助项目: BMBF, Deutsche Forschungsgemeinschaft
; DFG, Deutsche Forschungsgemeinschaft
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53800
Appears in Collections: 过去全球变化的重建
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作者单位: Geophysical Institute, University of Bergen and Bjerknes Centre for Climate Research, Bergen, Norway; GEOMAR, Helmholtz Centre for Ocean Research Kiel, Kiel, Germany; Max Planck Institute for Meteorology, Hamburg, Germany; Uni Climate, Uni Research and The Bjerknes Centre for Climate Research, Bergen, Norway
Recommended Citation:
Omrani N.-E.,Bader J.,Keenlyside N.S.,et al. Troposphere–stratosphere response to large-scale North Atlantic Ocean variability in an atmosphere/ocean coupled model[J]. Climate Dynamics,2016-01-01,46(2017-05-06)