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DOI | 10.1175/JCLI-D-17-0884.1 |
The Internal Generation of the Atlantic Ocean Interdecadal Variability | |
Arzel, Olivier; Huck, Thierry; de Verdiere, Alain Colin | |
2018-08-01 | |
发表期刊 | JOURNAL OF CLIMATE |
ISSN | 0894-8755 |
EISSN | 1520-0442 |
出版年 | 2018 |
卷号 | 31期号:16页码:6411-6432 |
文章类型 | Article |
语种 | 英语 |
国家 | France |
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 10(6) m(3) 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 degrees 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. |
英文关键词 | Instability Meridional overturning circulation Ocean circulation Planetary waves Climate variability Multidecadal variability |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000438488400003 |
WOS关键词 | MERIDIONAL OVERTURNING CIRCULATION ; SEA-SURFACE TEMPERATURE ; NORTH-ATLANTIC ; THERMOHALINE CIRCULATION ; MULTIDECADAL VARIABILITY ; HEAT-FLUX ; BAROCLINIC INSTABILITY ; ATMOSPHERE MODEL ; DECADAL VARIABILITY ; BOTTOM TOPOGRAPHY |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/19907 |
专题 | 气候变化 |
作者单位 | Univ Bretagne Occidentale, Lab Oceanog Phys & Spatiale, Brest, France |
推荐引用方式 GB/T 7714 | Arzel, Olivier,Huck, Thierry,de Verdiere, Alain Colin. The Internal Generation of the Atlantic Ocean Interdecadal Variability[J]. JOURNAL OF CLIMATE,2018,31(16):6411-6432. |
APA | Arzel, Olivier,Huck, Thierry,&de Verdiere, Alain Colin.(2018).The Internal Generation of the Atlantic Ocean Interdecadal Variability.JOURNAL OF CLIMATE,31(16),6411-6432. |
MLA | Arzel, Olivier,et al."The Internal Generation of the Atlantic Ocean Interdecadal Variability".JOURNAL OF CLIMATE 31.16(2018):6411-6432. |
条目包含的文件 | 条目无相关文件。 |
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