Hi Beate,
This formula doesn't look right -- it's singular when zs=0. Is it meant
only to be valid for some restricted range of zs?
Brian
On Fri, Jun 23, 2006 at 09:49:16AM +0200, Beate.Geyer at gkss.de wrote:
> Dear cf-metadata,
> I proposed to include following (not dimensionless) vertical coordinate to
> cf-conventions:
>
>
> Atmosphere Gal-Chen height coordinate (after Gal-Chen and Somerville,
> 1975)
> standard_name = "atmosphere_gal-chen_height_coordinate"
> Definition:
> z(n,k,j,i) = zs(j,i) + gal-chen(k)*(1-ztop/zs(j,i))
>
> where z(k,j,i) is altitude at gridpoint (k,j,i), ztop is the height at the
> top of the model, gal-chen(k) is the Gal-Chen height of the vertical
> gridpoint (k)in meter, and zs(j,i) is the surface altitude at horizontal
> gridpoint (j,i) (topography).
> The format for the formula_terms attribute is
> formula_terms = "gal-chen: var1 zs: var2 ztop: var3"
>
> _________________________________________________________________________
>
> Gal-Chen, T. et R. C. Somerville, 1975: On the Use of a Coordinate
> Transformation for the Solution of Navier-Stockes. J. Comput. Phys., 17,
> 209-228.
> original formulation:
>
> with ho = topographie (m)
> Z = gal-chen height (m)
> Ht = height of model top (m)
> h = height (m)
>
> Best regards,
> Beate
> ====================================================
> Dr. Beate Geyer
> GKSS Research Centre
> Institute for Coastal Research
> Max-Planck-Str.
> D-21502 Geesthacht, Germany
>
> www: http://icts.gkss.de
> ====================================================
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Received on Fri Jun 23 2006 - 08:39:45 BST
