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Record #187262:

Evidence for enhanced eddy mixing at middepth in the Southern Ocean / K. Shafer Smith, John Marshall.

Title: Evidence for enhanced eddy mixing at middepth in the Southern Ocean / K. Shafer Smith, John Marshall.
Author(s): Smith, K. Shafer.
Marshall, John.
Date: 2009.
In: Journal of Physical Oceanography. (2009.), Vol. 39(1) (2009)
Abstract: Authors argue that surface pressure patterns in core of Antarctic Circumpolar Current (ACC) that propagate downstream (eastward) 25% slower than mean surface current are suggestive of baroclinically unstable waves with steering level at depth of about 1 km. Detailed linear stability calculations using hydrographic atlas confirm implications of satellite altimetric observations, as do calculations using nonlinear model forced by mean shear and stratification observed close to core of ACC south of Tasmania, coinciding with position where mooring data and direct eddy flux measurements are available. When eddy fluxes are allowed to adjust mean state, computed eddy kinetic energy and eddy stress are close to observed magnitudes with steering levels between 1 and 1.5 km. Results indicate that vertical structure of potential vorticity (PV) eddy diffusivity is strongly depth dependent, implying that diffusivity for PV and buoyancy are very different. Includes discussion of implications for numerical models parameterizing transfer and mixing of properties by mesoscale eddies.
Notes:

Journal of Physical Oceanography. Vol. 39(1) :50-69 (2009).

Keywords: 551.46 -- Oceanography, physical.
551.465 -- Oceanography, dynamics.
551.465.15 -- Turbulence and eddies.
551.465.4 -- Oceanography, stratification.
551.465.5 -- Ocean currents.
519.673 -- Modelling.
C -- Oceanography, hydrography and hydrology.
(*7) -- Antarctic regions.
(*80) -- Southern Ocean.
(*86) -- Southern Ocean, Australian sector.
SPRI record no.: 187262

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500 ## ‡aJournal of Physical Oceanography. Vol. 39(1) :50-69 (2009).
520 3# ‡aAuthors argue that surface pressure patterns in core of Antarctic Circumpolar Current (ACC) that propagate downstream (eastward) 25% slower than mean surface current are suggestive of baroclinically unstable waves with steering level at depth of about 1 km. Detailed linear stability calculations using hydrographic atlas confirm implications of satellite altimetric observations, as do calculations using nonlinear model forced by mean shear and stratification observed close to core of ACC south of Tasmania, coinciding with position where mooring data and direct eddy flux measurements are available. When eddy fluxes are allowed to adjust mean state, computed eddy kinetic energy and eddy stress are close to observed magnitudes with steering levels between 1 and 1.5 km. Results indicate that vertical structure of potential vorticity (PV) eddy diffusivity is strongly depth dependent, implying that diffusivity for PV and buoyancy are very different. Includes discussion of implications for numerical models parameterizing transfer and mixing of properties by mesoscale eddies.
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650 07 ‡a551.465 -- Oceanography, dynamics.‡2udc
650 07 ‡a551.465.15 -- Turbulence and eddies.‡2udc
650 07 ‡a551.465.4 -- Oceanography, stratification.‡2udc
650 07 ‡a551.465.5 -- Ocean currents.‡2udc
650 07 ‡a519.673 -- Modelling.‡2udc
650 07 ‡aC -- Oceanography, hydrography and hydrology.‡2local
651 #7 ‡a(*7) -- Antarctic regions.‡2udc
651 #7 ‡a(*80) -- Southern Ocean.‡2udc
651 #7 ‡a(*86) -- Southern Ocean, Australian sector.‡2udc
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