| DOI: | 10.1175/JCLI-D-17-0884.1
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| Scopus记录号: | 2-s2.0-85050228445
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| 论文题名: | The internal generation of the Atlantic ocean interdecadal variability |
| 作者: | Arzel O.; Huck T.; de Verdière A.C.
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| 刊名: | Journal of Climate
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| ISSN: | 8948755
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| 出版年: | 2018
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| 卷: | 31, 期:16 | | 起始页码: | 6411
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| 结束页码: | 6432
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| 语种: | 英语
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| 英文关键词: | Climate variability
; Instability
; Meridional overturning circulation
; Multidecadal variability
; Ocean circulation
; Planetary waves
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| Scopus关键词: | Climatology
; Hopf bifurcation
; Plasma stability
; Surface waters
; Climate variability
; Meridional overturning circulations
; Multidecadal variability
; Ocean circulation
; Planetary Waves
; Oceanography
; bifurcation
; climate variation
; decadal variation
; meridional circulation
; oceanic general circulation model
; overturn
; planetary wave
; surface flux
; Atlantic Ocean
; Atlantic Ocean (North)
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| 英文摘要: | Numerical simulations of a realistic ocean general circulation model forced by prescribed surface fluxes are used to study the origin and structure of intrinsic interdecadal variability of the ocean circulation. When eddy-induced turbulent diffusivities are low enough, spontaneous oscillations of the Atlantic meridional overturning circulation (AMOC) with periods O(20) yr and amplitude O(1) Sv (1 Sv ≡ 106 m3 s-1) emerge. The transition from the steady to the oscillatory regime is shown to be consistent with a supercritical Hopf bifurcation of the horizontal Peclet number. Adding atmospheric thermal damping is shown to have a very limited influence on the domain of existence of intrinsic variability. The spatial structure of the mode consists of a dipole of sea surface temperature (SST)/sea surface height (SSH) anomalies centered at about 50°N with stronger variance in the western part of the subpolar gyre, in agreement with the observed Atlantic multidecadal oscillation (AMO) signature in this region. Specific features include a westward propagation of temperature anomalies from the source region located on the western flank of the North Atlantic Current (NAC) and a one-quarter phase lag between surface and subsurface (800 m) temperature anomalies. Local linear stability calculations including viscous and diffusive effects confirm that the North Atlantic Current is baroclinically unstable on scales of O(1000) km with growth rates of O(1) yr-1. Both the spatial structure of the mode and the period agree in magnitude with in situ measurements in the North Atlantic, suggesting that this intrinsic ocean mode participates in the observed Atlantic bidecadal climate variability. © 2018 American Meteorological Society. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/111429
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| Appears in Collections: | 气候减缓与适应
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作者单位: | Laboratoire d'Océanographie Physique et Spatiale, Université de Bretagne Occidentale, Brest, France
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| Recommended Citation: | |
Arzel O.,Huck T.,de Verdière A.C.. The internal generation of the Atlantic ocean interdecadal variability[J]. Journal of Climate,2018-01-01,31(16)
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