University of Tasmania
Browse

File(s) under permanent embargo

On geometrical aspects of interior ocean mixing

journal contribution
posted on 2023-05-18, 04:42 authored by McDougall, TJ, Groeskamp, S, Griffies, SM
The small-slope approximation to the full three-dimensional diffusion tensor of epineutral diffusion gives exactly the same tracer flux as the commonly used projected nonorthogonal diffusive flux of layered ocean models and of theoretical studies. The epineutral diffusion achieved by this small-slope approximation is not exactly in the direction of the correct epineutral tracer gradient. That is, the use of the small-slope approximation leads to a very small flux of tracer in a direction in which there is no epineutral gradient of tracer. For (the tracer) temperature or salinity, the difference between the correct epineutral gradient and the smallslope approximation to it is proportional to neutral helicity. The authors also make the point that small-scale turbulent mixing processes act to diffuse tracers isotropically (i.e., the same in each spatial direction) and hence it is strictly a misnomer to call this process ‘‘dianeutral diffusion’’ or ‘‘vertical diffusion.’’ This realization also has implications for the diffusion tensor.

History

Publication title

Journal of Physical Oceanography

Volume

44

Issue

8

Pagination

2164-2175

ISSN

0022-3670

Department/School

Institute for Marine and Antarctic Studies

Publisher

Amer Meteorological Soc

Place of publication

45 Beacon St, Boston, USA, Ma, 02108-3693

Rights statement

Copyright 2014 American Meteorological Society

Repository Status

  • Restricted

Socio-economic Objectives

Measurement and assessment of marine water quality and condition

Usage metrics

    University Of Tasmania

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC