| DOI: | 10.1002/2015GL064256
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| 论文题名: | Southern Annular Mode and westerly-wind-driven changes in Indian-Atlantic exchange mechanisms |
| 作者: | Loveday B.R.; Penven P.; Reason C.J.C.
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| 刊名: | Geophysical Research Letters
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| ISSN: | 0094-8688
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| EISSN: | 1944-8419
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| 出版年: | 2015
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| 卷: | 42, 期:12 | | 起始页码: | 4912
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| 结束页码: | 4921
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| 语种: | 英语
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| 英文关键词: | Agulhas leakage
; interbasin exchange
; mesoscale variability
; oceanography
; Southern Annular Mode
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| Scopus关键词: | Signal processing
; Storms
; Atlantic meridional overturning circulations
; Exchange mechanism
; Indian ocean
; Mesoscale variability
; Ocean model
; Southern Annular Mode
; Turbulent eddy
; Westerly winds
; Oceanography
; hindcasting
; leakage
; meridional circulation
; mesoscale eddy
; overturn
; westerly
; wind-driven circulation
; Agulhas Current
; Atlantic Ocean
; Indian Ocean
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| 英文摘要: | The dynamical link between the Indian Ocean and Atlantic Meridional Overturning Circulation (AMOC) remains poorly understood. This partly arises from the complex Agulhas leakage, which occurs via rings, cyclones, and non-eddy flux. Hindcast simulations suggest that leakage has recently increased but have not decomposed this signal into its constituent mechanisms. Here these are isolated in a realistic ocean model. Increases in simulated leakage are attributed to stronger eddy and non-eddy-driven transports, and a strong warming and salinification, especially within Agulhas rings. Variability in both regimes is associated with strengthening Indian Ocean westerly winds, reflecting an increasingly positive Southern Annular Mode. While eddy and non-eddy flux signals are tied through turbulent eddy dissipation, the ratio between the two varies decadally. Consequently, while altimetry suggests a recent increase in retroflection turbulence and implied leakage, non-eddy flux may also play a significant role in modulating the leakage AMOC connection. © 2015. American Geophysical Union. All Rights Reserved. |
| URL: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-84948718776&doi=10.1002%2f2015GL064256&partnerID=40&md5=e7b2dd736588cb68c291c490a7fe856a
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| Citation statistics: |
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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/8304
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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: | Department of Oceanography, University of Cape Town, Cape Town, South Africa
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| Recommended Citation: | |
Loveday B.R.,Penven P.,Reason C.J.C.. Southern Annular Mode and westerly-wind-driven changes in Indian-Atlantic exchange mechanisms[J]. Geophysical Research Letters,2015-01-01,42(12).
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