Thickness diffusivity in the Southern Ocean

Details Thickness diffusivity in the Southern Ocean Thickness diffusivity in the Southern Ocean

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006georl..3311606e&link_type=abstract

Geophysical Research Letters, Volume 33, Issue 11, CiteID L11606

Statistics

Computation

7

Computational Geophysics: Numerical Solutions (4255), Oceanography: Physical: Eddies And Mesoscale Processes, Oceanography: Physical: General Circulation (1218, 1222)

Scientific paper

Thickness diffusivity ($\kappa$) according to the Gent and McWilliams parameterisation which accounts for eddy-driven advection in the ocean, is estimated using output from an eddy-resolving model of the Southern Ocean. A physically meaningful definition of rotational eddy fluxes leads almost everywhere to positive $\kappa$. Zonally averaged near surface values of $\kappa$ remain smaller than 200 m2/s poleward of the polar front, increases between 60-45°S to about 600 m2/s and peak between 45-35° S at almost 3000 m2/s. $\kappa$ stays high in the upper 500 m but decreases with depth and is essentially zero below 2500 m. In addition to the thickness diffusion ($\kappa$) there is eddy-induced eastward (westward) advection of isopycnal thickness at the poleward (equatorward) flank of the ACC pointing toward strong anisotropic lateral mixing.

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