DOI: 10.1002/2014GL061880
论文题名: Antarctic Circumpolar Current transport and barotropic transition at Macquarie Ridge
作者: Rintoul S.R. ; Sokolov S. ; Williams M.J.M. ; Peña Molino B. ; Rosenberg M. ; Bindoff N.L.
刊名: Geophysical Research Letters
ISSN: 0094-9683
EISSN: 1944-9414
出版年: 2014
卷: 41, 期: 20 起始页码: 7254
结束页码: 7261
语种: 英语
英文关键词: Antarctic Circumpolar Current
; barotropic
; Macquarie Ridge
; Southern Ocean
; topographic interaction
; transport
Scopus关键词: Aneroid altimeters
; Antarctic Circumpolar Currents
; Barotropic
; Macquarie Ridge
; Southern ocean
; topographic interaction
; transport
; Ocean currents
; acceleration
; barotropic motion
; circumpolar current
; data set
; dissipation
; measurement method
; momentum
; numerical model
; satellite altimetry
; topography
; velocity
; Macquarie Ridge
; Pacific Ocean
英文摘要: Theory and numerical simulations suggest that topographic interactions are central to the dynamics of the Antarctic Circumpolar Current (ACC), but few observations are available to test these ideas. We use direct velocity measurements, satellite altimetry, and an ocean state estimate to investigate the interaction of the ACC with the Macquarie Ridge. Satellite altimeter data show that the Subantarctic Front crosses the ridge through a gap immediately north of Macquarie Island. Yearlong current meter records reveal strong deep mean flow (>-0.2-m-s-1 at 3000-m) and substantial transport (52 ± 8 × 106-m3-s-1) in the 50-km wide gap. The ACC becomes much more barotropic at the ridge. Acceleration of the deep jet is balanced by the ageostrophic along-gap pressure gradient, convergence of zonal momentum by the mean vertical velocity, and dissipation. The study helps explain how the ACC negotiates large topographic obstacles and highlights the role of local, nonlinear processes in the dynamical balance of the ACC. Key Points Antarctic Circumpolar Current velocity was measured at Macquarie RidgeThe current becomes more barotropic as it crosses the ridgeLocal nonlinear processes accelerate deep jet ©2014. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84911445948&doi=10.1002%2f2014GL061880&partnerID=40&md5=2093d80ea6eb378e34437b173c5ea993
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6947
Appears in Collections: 气候减缓与适应
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作者单位: Oceans and Atmosphere Flagship, CSIRO, Hobart, TAS, Australia
Recommended Citation:
Rintoul S.R.,Sokolov S.,Williams M.J.M.,et al. Antarctic Circumpolar Current transport and barotropic transition at Macquarie Ridge[J]. Geophysical Research Letters,2014-01-01,41(20).