Isoneutral diffusion in a z-coordinate ocean model

This paper considers the requirements that must be satisfied in order to provide a stable and physically based isoneutral tracer diffusion scheme in a z-coordinate ocean model. Two properties are emphasized: 1) downgradient orientation of the diffusive fluxes along the neutral directions and 2) zero isoneutral diffusive flux of locally referenced potential density. It is shown that the Cox diffusion scheme does not respect either of these properties, which provides an explanation for the necessity to add a nontrivial background horizontal diffusion to that scheme. A new isoneutral diffusion scheme is proposed that aims to satisfy the stated properties and is found to require no horizontal background diffusion.

• Publication year

  1998

• Venue

  Oceanographic Literature Review

• Publication date

  1998-05-01

• Fields of study

  Physics, Environmental Science

• Identifiers
  DOI 10.1175/1520-0485(1998)028<0805:IDIAZC>2.0.CO;2
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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