DOI: 10.1002/2015GL067384
论文题名: Stationary mesoscale eddies, upgradient eddy fluxes, and the anisotropy of eddy diffusivity
作者: Lu J. ; Wang F. ; Liu H. ; Lin P.
刊名: Geophysical Research Letters
ISSN: 0094-9464
EISSN: 1944-9195
出版年: 2016
卷: 43, 期: 2 起始页码: 743
结束页码: 751
语种: 英语
英文关键词: eddy diffusivity
; mesoscale eddy parameterization
; stationary eddies
; topography
; transient eddies
; upgradient eddy flux
Scopus关键词: Anisotropy
; Diffusion
; Kinetic energy
; Kinetics
; Parameterization
; Topography
; Baroclinic instability
; Eddy Diffusivities
; Eddy fluxes
; Mesoscale eddy
; Parameterization schemes
; Potential vorticity
; Quantitative method
; stationary eddies
; Oceanography
; anisotropy
; baroclinic instability
; diffusivity
; flux measurement
; mesoscale eddy
; oceanic circulation
; parameterization
; potential vorticity
; standing wave
; topography
; transient flow
; Southern Ocean
英文摘要: The mesoscale eddies of which parameterization is needed in coarse-resolution ocean models include not only the transient eddies akin to baroclinic instability but also the stationary eddies associated with topography. By applying a modified Lorenz-type decomposition to the eddy-permitting Southern Ocean State Estimate, we show that the stationary mesoscale eddies contribute a significant part to the total eddy kinetic energy, eddy enstrophy, and the total eddy-induced isopycnal thickness and potential vorticity fluxes. We find that beneath middepth (about 1000 m) the upgradient eddy fluxes, or so-called "negative" eddy diffusivities, are mainly attributed to the stationary mesoscale eddies, whereas the remaining transient eddy diffusivity is positive, for which the Gent and McWilliams (1990) parameterization scheme applies well. A quantitative method of measuring the anisotropy of eddy diffusivity is presented. The effect of stationary mesoscale eddies is one of major sources responsible for the anisotropy of eddy diffusivity. We suggest that an independent parameterization scheme for stationary mesoscale eddies may be needed for coarse-resolution ocean models, although the transient eddies remain the predominant part of mesoscale eddies in the oceans. © 2016. American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84958047901&doi=10.1002%2f2015GL067384&partnerID=40&md5=bbc9455c2d816f11ae034e938f8a9ae1
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/10427
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: LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China
Recommended Citation:
Lu J.,Wang F.,Liu H.,et al. Stationary mesoscale eddies, upgradient eddy fluxes, and the anisotropy of eddy diffusivity[J]. Geophysical Research Letters,2016-01-01,43(2).