DOI: 10.1002/2013GL057751
论文题名: Agulhas ring formation as a barotropic instability of the retroflection
作者: Weijer W. ; Zharkov V. ; Nof D. ; Dijkstra H.A. ; De Ruijter W.P.M. ; Van Scheltinga A.T. ; Wubs F.
刊名: Geophysical Research Letters
ISSN: 0094-8466
EISSN: 1944-8197
出版年: 2013
卷: 40, 期: 20 起始页码: 5435
结束页码: 5438
语种: 英语
英文关键词: Agulhas leakage
Scopus关键词: Atlantic Ocean
; Background flow
; Global ocean circulation
; IT transfers
; Reduced-gravity model
; Ring formation
; Ring shedding
; Steady circulation
; Chemical reactions
; Stability
; background level
; barotropic instability
; barotropic wave
; gyre
; Rossby wave
; shear zone
; Agulhas Current
; Agulhas Ridge
; Atlantic Ocean
; Indian Ocean
英文摘要: Agulhas Leakage is an important link in the global ocean circulation, as it transfers a significant volume of relatively warm and salty water from the Indian Ocean to the Atlantic Ocean. The main route of this transfer is through the shedding of large Agulhas rings from the Agulhas retroflection. In this paper we study the dynamics of the ring formation process by analyzing the stability of the Indian/Atlantic supergyre in a reduced gravity model. We show that the ring shedding process results from a barotropic instability of the steady circulation in the Agulhas retroflection region. The destabilizing mode appears to be linked to a Rossby basin mode of the combined South Indian/Atlantic basin, which is localized in the retroflection region by the background flow. Key Points Agulhas ring formation reflects an instability of the retroflection The mechanism is a barotropic instability of the shear zone The instability is linked to a global Rossby basin mode ©2013 The Authors. Geophysical Research Letters published by Wiley on behalf of the American Geophysical Union. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84885515863&doi=10.1002%2f2013GL057751&partnerID=40&md5=72a3eba394f7e7bbd68078a783c2fe19
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/5730
Appears in Collections: 气候减缓与适应
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作者单位: Los Alamos National Laboratory, CCS-2, MS B214, Los Alamos, NM 87545, United States
Recommended Citation:
Weijer W.,Zharkov V.,Nof D.,et al. Agulhas ring formation as a barotropic instability of the retroflection[J]. Geophysical Research Letters,2013-01-01,40(20).