Publication Abstracts

Yin and Fung 1991

Yin, F.L., and I.Y. Fung, 1991: Net diffusivity in ocean general circulation models with nonuniform grids. J. Geophys. Res., 96, 10773-10776, doi:10.1029/91JC00883.

The numerical vertical diffusivity Knum, embedded in a numerical ocean general circulation model with nonuniform vertical grid, is estimated. It is shown that in a downwelling region, Knum is negative for a grid with grid size increasing with depth. When the grid size increment, or the downward vertical velocity, is large, Knum may exceed the vertical diffusivity specified and may result in a negative effective vertical diffusivity. Therefore care needs to be taken to specify the vertical diffusivity in a numerical model with nonuniform grid, and a lower bound is generally imposed in order to avoid an unphysical negative value. Some possible effects of the negative effective diffusivity are discussed.

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BibTeX Citation

@article{yi01000b,
  author={Yin, F. L. and Fung, I. Y.},
  title={Net diffusivity in ocean general circulation models with nonuniform grids},
  year={1991},
  journal={Journal of Geophysical Research},
  volume={96},
  pages={10773--10776},
  doi={10.1029/91JC00883},
}

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RIS Citation

TY  - JOUR
ID  - yi01000b
AU  - Yin, F. L.
AU  - Fung, I. Y.
PY  - 1991
TI  - Net diffusivity in ocean general circulation models with nonuniform grids
JA  - J. Geophys. Res.
JO  - Journal of Geophysical Research
VL  - 96
SP  - 10773
EP  - 10776
DO  - 10.1029/91JC00883
ER  -

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