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What is wrong with isopycnal diffusion in world ocean models?
Mathieu, P.-P.; Deleersnijder, E. (1998). What is wrong with isopycnal diffusion in world ocean models? Appl. Math. Modelling 22: 367-378
In: Applied Mathematical Modelling. IPC Science and Technology Press: New York etc.. ISSN 0307-904X, more
Peer reviewed article  

Available in Authors 

Keywords
    Diffusion; Isopycnics; Mesoscale eddies; Modelling; Ocean circulation; Marine

Authors  Top 
  • Mathieu, P.-P.
  • Deleersnijder, E., more

Abstract
    Coarse grid Ocean General Circulation Models (OGCMs) take into account the effect of unresolved mesoscale eddies by means of a rotated mixing operator which diffuses tracers (such as temperature or salinity) along surfaces of constant potential density called isopycnals. In spite of its profitable physical aspects, the discrete version of the isopycnal mixing parameterization can produce oscillations in the tracer fields, which disagrees with the well-known properties of diffusion operators. The causes of this non-monotonic behaviour of a diffusion operator are highlighted. The location and magnitude of these over-/under-shootings are examined in the results of an OGCM.

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