DOI: 10.1029/2012GL054235
论文题名: Thermobaric control of gravitational potential energy generation by diapycnal mixing in the deep ocean
作者: Oliver K.I.C. ; Tailleux R.
刊名: Geophysical Research Letters
ISSN: 0094-9360
EISSN: 1944-9091
出版年: 2013
卷: 40, 期: 2 起始页码: 327
结束页码: 331
语种: 英语
Scopus关键词: Climatological distributions
; Diapycnal mixing
; Generation rate
; Gravitational potential energy
; Large-scale circulation
; Large-scale ocean circulations
; Mixing energies
; Turbulent mixing
; Equations of state
; Gravitation
; Hydrostatic pressure
; Oceanography
; Potential energy
; Mixing
; deep sea
; dissipation
; hydrostatics
; nonlinearity
; potential energy
; power generation
; pycnocline
; source-sink dynamics
; turbulent mixing
英文摘要: Sources and sinks of gravitational potential energy (GPE) play a rate-limiting role in the large-scale ocean circulation. A key source is turbulent diapycnal mixing, whereby irreversible mixing across isoneutral surfaces is enhanced by turbulent straining of these surfaces. This has motivated international observational efforts to map diapycnal mixing in the global ocean. However, in order to accurately relate the GPE supplied to the large-scale circulation by diapycnal mixing to the mixing energy source, it is first necessary to determine the ratio, ξ, of the GPE generation rate to the available potential energy dissipation rate associated with turbulent mixing. Here the link between GPE and hydrostatic pressure is used to derive the GPE budget for a compressible ocean with a nonlinear equation of state. The role of diapycnal mixing is isolated and from this a global climatological distribution of ξ is calculated. It is shown that, for a given source of mixing energy, typically three times as much GPE is generated if the mixing takes place in bottom waters rather than in the pycnocline. This is due to GPE destruction by cabbelling in the pycnocline, as opposed to thermobaric enhancement of GPE generation by diapycnal mixing in the deep ocean. © 2013. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84874831618&doi=10.1029%2f2012GL054235&partnerID=40&md5=cd235e814c52d487d1732b18b8171c82
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/6624
Appears in Collections: 气候减缓与适应
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作者单位: National Oceanography Centre, Southampton, University of Southampton, Southampton SO14 3ZH, United Kingdom
Recommended Citation:
Oliver K.I.C.,Tailleux R.. Thermobaric control of gravitational potential energy generation by diapycnal mixing in the deep ocean[J]. Geophysical Research Letters,2013-01-01,40(2).