DOI: 10.1007/s00382-015-2754-3
Scopus记录号: 2-s2.0-84966283994
论文题名: Oceanic control of multidecadal variability in an idealized coupled GCM
作者: Jamet Q. ; Huck T. ; Arzel O. ; Campin J.-M. ; de Verdière A.C.
刊名: Climate Dynamics
ISSN: 9307575
出版年: 2016
卷: 46, 期: 2017-09-10 起始页码: 3079
结束页码: 3095
语种: 英语
英文关键词: Air–sea interactions
; Atlantic multidecadal oscillation
; Idealized configuration
; NAO
; Rossby waves
英文摘要: Idealized ocean models are known to develop intrinsic multidecadal oscillations of the meridional overturning circulation (MOC). Here we explore the role of ocean–atmosphere interactions on this low-frequency variability. We use a coupled ocean–atmosphere model set up in a flat-bottom aquaplanet geometry with two meridional boundaries. The model is run at three different horizontal resolutions (4°, 2° and 1°) in both the ocean and atmosphere. At all resolutions, the MOC exhibits spontaneous variability on multidecadal timescales in the range 30–40 years, associated with the propagation of large-scale baroclinic Rossby waves across the Atlantic-like basin. The unstable region of growth of these waves through the long wave limit of baroclinic instability shifts from the eastern boundary at coarse resolution to the western boundary at higher resolution. Increasing the horizontal resolution enhances both intrinsic atmospheric variability and ocean–atmosphere interactions. In particular, the simulated atmospheric annular mode becomes significantly correlated to the MOC variability at 1° resolution. An ocean-only simulation conducted for this specific case underscores the disruptive but not essential influence of air–sea interactions on the low-frequency variability. This study demonstrates that an atmospheric annular mode leading MOC changes by about 2 years (as found at 1° resolution) does not imply that the low-frequency variability originates from air–sea interactions. © 2015, Springer-Verlag Berlin Heidelberg. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/53767
Appears in Collections: 过去全球变化的重建
There are no files associated with this item.
作者单位: Laboratoire de Physique des Océans (UMR 6523 CNRS IFREMER IRD UBO), Université de Bretagne Occidentale, UFR Sciences, 6 avenue Le Gorgeu, CS 93837, Brest Cedex 3, France; Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA, United States
Recommended Citation:
Jamet Q.,Huck T.,Arzel O.,et al. Oceanic control of multidecadal variability in an idealized coupled GCM[J]. Climate Dynamics,2016-01-01,46(2017-09-10)