I havent seen any example files that use that.
It would be great to not only make it right, but have an example file that uses it, that we could test software against.
Jonathan Gregory wrote:
> Dear All
>
> I believe that the current definition of the atmosphere hybrid height
> coordinate in CF Appendix D is incorrect. To match what is used in the HadGEM1
> model, the definition should be as below. Is anyone using the definition
> which currently appears in the standard? If not I propose we should replace it.
>
> Cheers
>
> Jonathan
>
>
> standard_name = "atmosphere_hybrid_height_coordinate"
>
> Definition:
>
> z(n,k,j,i) = a(k) + b(k)*orog(n,j,i)
>
> where z(n,k,j,i) is the height above the geoid (approximately mean sea level)
> at gridpoint (k,j,i) and time (n), orog(n,j,i) is the height of the surface
> above the geoid at (j,i) and time (n), and a(k) and b(k) are the coordinates
> which define hybrid height level k. a(k) has the dimensions of height and b(k)
> is dimensionless.
>
> The format for the formula_terms attribute is
>
> formula_terms = "tau: var1 eta: var2 ztop: var3 zsurface: var4" formula_terms =
> "a: var1 b: var2 orog: var3"
>
> There is no dimensionless hybrid height coordinate. The hybrid height is best
> approximated as a(k) if a level-dependent constant is needed.
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Received on Mon Nov 14 2005 - 09:04:46 GMT
