Hi Richard,
In your example, I think it would be o.k. to define z(z) as your
vertical coordinate variable (your first example). You would then
store in z(z) the values of ap(z)/p0+b(z), which is the vertical
coordinate as defined in appendix D of the conventions document.
I don't think your second example makes sense ... are you storing b in z
or ap in z??
I hope someone else will confirm this because I'm not absolutely positive.
Best regards,
Karl
On 8/16/12 5:04 AM, Hattersley, Richard wrote:
Dimensionless vertical coordinate values
Hi all,
What does the standard name of a dimensionless vertical coordinate
imply about the meaning of the numeric values of that coordinate?
For example, if a coordinate variable has a standard name of
"atmosphere_hybrid_sigma_pressure_coordinate" does that imply it must
contain values for either a(k)+b(k) or ap(k)/p0+b(k)?
float z(z) ;
z:standard_name = "atmosphere_hybrid_sigma_pressure_coordinate" ;
z:long_name = "(delta / p0) + sigma" ;
z:units = "1" ;
z:formula_terms = "ap: delta b: sigma ps: surface_pressure" ;
z:positive = "down" ;
float delta(z) ;
delta:units = "Pa" ;
float sigma(z) ;
sigma:units = "1" ;
float surface_pressure(y, x) ;
surface_pressure:units = "Pa" ;
Or to put it another way, if it just contained values for ap(k) and
appeared in its own list of formula terms would that be invalid?
float z(z) ;
z:standard_name = "atmosphere_hybrid_sigma_pressure_coordinate" ;
z:units = "1" ;
z:formula_terms = "ap: delta b: z ps: surface_pressure" ;
z:positive = "down" ;
float delta(z) ;
delta:units = "Pa" ;
float surface_pressure(y, x) ;
surface_pressure:units = "Pa" ;
Richard Hattersley AVD Iris Technical Lead
*Met Office* FitzRoy Road Exeter Devon EX1 3PB United Kingdom
Tel: +44 (0)1392 885702 Fax: +44 (0)1392 885681
Email: [email protected]_
<mailto:[email protected]> Website:
_www.metoffice.gov.uk_ <http://www.metoffice.gov.uk>
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