DOI: 10.1002/2014GL061538
论文题名: Observations of a diapycnal shortcut to adiabatic upwelling of Antarctic Circumpolar Deep Water
作者: Silvester J.M. ; Lenn Y.-D. ; Polton J.A. ; Rippeth T.P. ; Maqueda M.M.
刊名: Geophysical Research Letters
ISSN: 0094-9593
EISSN: 1944-9324
出版年: 2014
卷: 41, 期: 22 起始页码: 7950
结束页码: 7956
语种: 英语
英文关键词: adiabatic upwelling
; diapycnal mixing
; dissipation
; internal tide
; meridional overturning circulation
; Southern Ocean
Scopus关键词: Earth (planet)
; Energy dissipation
; Hydrographic surveys
; Mixing
; Ray tracing
; Tides
; Turbulence
; adiabatic upwelling
; Diapycnal mixing
; Internal tides
; Meridional overturning circulations
; Southern ocean
; Oceanography
; adiabatic lapse rate
; continental slope
; dissipation
; internal tide
; meridional circulation
; observational method
; tidal cycle
; topography
; transformation
; upwelling
; water mass
; Antarctic Circumpolar Current
; Antarctica
; Elephant Island
; South Shetland Islands
; Southern Ocean
英文摘要: In the Southern Ocean, small-scale turbulence causes diapycnal mixing which influences important water mass transformations, in turn impacting large-scale ocean transports such as the Meridional Overturning Circulation (MOC), a key controller of Earth's climate. We present direct observations of mixing over the Antarctic continental slope between water masses that are part of the Southern Ocean MOC. A 12 h time series of microstructure turbulence measurements, hydrography, and velocity observations off Elephant Island, north of the Antarctic Peninsula, reveals two concurrent bursts of elevated dissipation of O(10-6) W kg-1, resulting in heat fluxes ∼10 times higher than basin-integrated Drake Passage estimates. This occurs across the boundary between adjacent adiabatic upwelling and downwelling overturning cells. Ray tracing to nearby topography shows mixing between 300 and 400 m is consistent with the breaking of locally generated internal tidal waves. Since similar conditions extend to much of the Antarctic continental slope where these water masses outcrop, diapycnal mixing may contribute significantly to upwelling. © 2014. The Authors. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84923320795&doi=10.1002%2f2014GL061538&partnerID=40&md5=11bf8262abefbc7886dbc5e68014e96e
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6857
Appears in Collections: 气候减缓与适应
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作者单位: National Oceanography Centre, Liverpool, United Kingdom
Recommended Citation:
Silvester J.M.,Lenn Y.-D.,Polton J.A.,et al. Observations of a diapycnal shortcut to adiabatic upwelling of Antarctic Circumpolar Deep Water[J]. Geophysical Research Letters,2014-01-01,41(22).