Dear Oystein
Since the UV index is a standard quantity, it seems fine to me to give it a
standard name of uv_index, or ultraviolet_index - which would be better? I
don't think "surface" is needed unless it is sometimes reported at other
levels - is it?
I would assume that without qualification it would refer to the actual or
forecast cloud cover. If you would like to provide it as dependent on cloud
cover, this could be done by giving it a coordinate variable or scalar
coordinate variable with a standard_name of cloud_area_fraction. If you
prefer to indicate the cloudiness in the standard name, I think this could
be done for clear-sky on the pattern of existing standard names as
uv_index_assuming_clear_sky
There aren't any existing standard names for complete or partial cloud cover.
Complete cloud cover is well-defined and an "assuming" phrase could be agreed
for that, I imagine. Does partial cloud cover have a precise definition?
Best wishes
Jonathan Gregory
----- Forwarded message from ?ystein God?y <o.godoy at met.no> -----
> From: ?ystein God?y <o.godoy at met.no>
> To: cf-metadata at cgd.ucar.edu
> Date: Fri, 15 Nov 2013 09:26:45 +0100
> User-Agent: KMail/4.10.5 (Linux/3.8.0-26-generic; KDE/4.10.5; x86_64; ; )
> Subject: [CF-metadata] UV-index in CF compliant files
>
> Dear community,
>
> I am in the process of moving towards usage of NetCDF/CF for our Ultraviolet
> index forecast. In this context I am wondering which standard name to use for
> this variable. Some information on UV-index can be found at
> http://www.who.int/uv/intersunprogramme/activities/uv_index/en/index1.html
>
> As forecasted cloud cover may be uncertain we always provide the UV-index for
> clear sky conditions, partly cloudy, overcast and then with the forecasted
> cloud cover. I would like to retain this in the NetCDF/CF files as well,
> leaving the choice of which to use to the end user or the application.
>
> I was not able to find any relevant standard name in the table, and in the
> NCEP GRIB code to CF standard name mapping, the CF standard name was
> missing.
>
> What would be the appropriate new standard name to use for this purpose?
> uvindex or surface_uvindex with the potential of adding a modifier identifying
> the cloud cover and unit 1?
>
> All the best
> ?ystein
> --
> Dr. Oystein Godoy
> Norwegian Meteorological Institute
> P.O.BOX 43, Blindern, N-0313 OSLO, Norway
> Ph: (+47) 2296 3000 (switchb) 2296 3334 (direct line)
> Fax:(+47) 2296 3050 Institute home page: http://met.no/
>
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----- End forwarded message -----
Received on Fri Nov 15 2013 - 01:58:35 GMT
