Estimating suppression of eddy mixing by mean flows

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dc.contributor.authorKlocker, Andreas
dc.contributor.authorFerrari, Raffaele
dc.contributor.authorLaCasce, Joseph H
dc.date.accessioned2015-12-13T22:19:43Z
dc.date.issued2012
dc.date.updated2016-02-24T09:04:28Z
dc.description.abstractParticle- and tracer-based estimates of lateral diffusivities are used to estimate the suppression of eddy mixing across strong currents. Particles and tracers are advected using a velocity field derived from sea surface height measurements from the South Pacific, in a region west of Drake Passage. This velocity field has been used in a companion paper to show that both particle- and tracer-based estimates of eddy diffusivities are equivalent, despite recent claims to the contrary. These estimates of eddy diffusivities are here analyzed to show 1) that the degree of suppression of mixing across the strong Antarctic Circumpolar Current is correctly predicted by mixing length theory modified to include eddy propagation along the mean flow and 2) that the suppression can be inferred from particle trajectories by studying the structure of the autocorrelation function of the particle velocities beyond the first zero crossing. These results are then used to discuss how to compute lateral and vertical variations in eddy diffusivities using floats and drifters in the real ocean.
dc.identifier.issn0022-3670
dc.identifier.urihttp://hdl.handle.net/1885/71964
dc.publisherAmerican Meteorological Society
dc.sourceJournal of Physical Oceanography
dc.subjectKeywords: Antarctic Circumpolar Currents; Autocorrelation functions; Drake passage; Eddies; Eddy Diffusivities; Eddy mixing; Lateral diffusivity; Mean flow; Mesoscale process; Mixing length; Particle trajectories; Particle velocities; Sea surface height measurement Diffusion; Dispersion; Eddies; Mesoscale processes; Mixing; Turbulence
dc.titleEstimating suppression of eddy mixing by mean flows
dc.typeJournal article
local.bibliographicCitation.issue9
local.bibliographicCitation.lastpage1576
local.bibliographicCitation.startpage1566
local.contributor.affiliationKlocker, Andreas, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationFerrari, Raffaele, Massachusetts Institute of Technology
local.contributor.affiliationLaCasce, Joseph H, University of Oslo
local.contributor.authoremailrepository.admin@anu.edu.au
local.contributor.authoruidKlocker, Andreas, u5113384
local.description.embargo2037-12-31
local.description.notesImported from ARIES
local.identifier.absfor040503 - Physical Oceanography
local.identifier.ariespublicationf5625xPUB2978
local.identifier.citationvolume42
local.identifier.doi10.1175/JPO-D-11-0205.1
local.identifier.scopusID2-s2.0-84868120630
local.identifier.thomsonID000312478000005
local.identifier.uidSubmittedByf5625
local.type.statusPublished Version

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