| DOI: | 10.1002/2016GL068177
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| 论文题名: | A Southern Ocean mode of multidecadal variability |
| 作者: | Le Bars D.; Viebahn J.P.; Dijkstra H.A.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-9273
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| EISSN: | 1944-9004
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| 出版年: | 2016
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| 卷: | 43, 期:5 | | 起始页码: | 2102
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| 结束页码: | 2110
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| 语种: | 英语
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| 英文关键词: | baroclinic instability
; intrinsic variability
; mode of variability
; multidecadal variability
; ocean heat content
; Southern Ocean
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| Scopus关键词: | Enthalpy
; Feedback
; Heat flux
; Ocean currents
; Baroclinic instability
; Intrinsic variabilities
; Mode of variability
; Multidecadal variability
; Ocean heat content
; Southern ocean
; Oceanography
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| 英文摘要: | A 250 year simulation of a strongly eddying global version of the Parallel Ocean Program (POP) model reveals a new mode of intrinsic multidecadal variability, the Southern Ocean Mode (SOM), with a period of 40-50 year. The peak-to-peak difference in the global ocean heat content within a multidecadal cycle is up to 60 ZJ. This change results from surface heat flux variations in the South Atlantic and propagation of temperature anomalies along the Antarctic Circumpolar Current and into the Weddell gyre around 30°E. The temperature anomalies propagate as deep as 5000 m along the isopycnals between 50°S and 30°S and induce multidecadal changes in the Atlantic Meridional Overturning Circulation. A positive feedback loop between the generation of eddies through baroclinic instability and the dynamics of the mean circulation is essential for the existence of the SOM. The dominant physics appears similar to that responsible for variability found in a three-layer quasi-geostrophic eddy-resolving model. This combined with the fact that the SOM is not found in a noneddying version of the same global POP model further suggests that eddy processes are crucial for its existence and/or excitation. © 2016. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84959905480&doi=10.1002%2f2016GL068177&partnerID=40&md5=a2002d611e4e391a1ae97fb0c5c3e581
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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/10236
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| Appears in Collections: | 科学计划与规划
气候变化与战略
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作者单位: | Institute for Marine and Atmospheric Research Utrecht, Department of Physics and Astronomy, Utrecht University, Utrecht, Netherlands
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| Recommended Citation: | |
Le Bars D.,Viebahn J.P.,Dijkstra H.A.. A Southern Ocean mode of multidecadal variability[J]. Geophysical Research Letters,2016-01-01,43(5).
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