Dear Bruno, Jonathan and Roy,
Thanks all for your comments. As far as the standard name is concerned,
I think we are agreed on aerosol_particle_diameter to describe the
particle sizes. This would have an SI unit of m.
This name is accepted for inclusion in the standard name table.
------
Alison Pamment Tel: +44 1235 778065
NCAS/British Atmospheric Data Centre Fax: +44 1235 446314
Rutherford Appleton Laboratory Email: alison.pamment at stfc.ac.uk
Chilton, Didcot, OX11 0QX, U.K.
> -----Original Message-----
> From: cf-metadata-bounces at cgd.ucar.edu [mailto:cf-metadata-
> bounces at cgd.ucar.edu] On Behalf Of Jonathan Gregory
> Sent: 27 November 2010 14:21
> To: cf-metadata at cgd.ucar.edu
> Subject: [CF-metadata] Correct name for aerosol size
> distributionexpressedin numbers ?
>
> Dear Bruno
>
> Either the geophysical quantity or the bin index could be the
> coordinate
> variable, with the other one being an auxiliary coordinate variable.
> That
> is an arbitrary choice. If you don't need the bin index, you don't
have
> to
> have such a variable at all. Both
>
> SPP200_bins = 30 ;
> int SPP200_bins(SPP200_bins) ;
> float SPP200_median_particle_diameter(SPP200_bins) ;
> float mic_conctab_SPP200_sync_1(time, SPP200_bins) ;
> mic_conctab_SPP200_sync_1:coordinates =
> "SPP200_median_particle_diameter" ;
>
> and
>
> SPP200_median_particle_diameter = 30;
> int SPP200_bins(SPP200_median_particle_diameter) ;
> float
> SPP200_median_particle_diameter(SPP200_median_particle_diameter);
> float mic_conctab_SPP200_sync_1(time,
> SPP200_median_particle_diameter) ;
> mic_conctab_SPP200_sync_1:coordinates = "SPP200_bins";
>
> would be OK. time does not need to be named in the coordinates
> attribute,
> since it is a coordinate variable. (You can list it there if you like,
> but
> it is not usual.)
>
> > One last question I couldn't solve : should
> > "bounds="SPP200_bin_bounds" be a attribute of the simple index
> variable
> > ("SPP200_bins") or of the the geophysices coordinate
> > ("SPP200_median_particle_diameter") ?
>
> The latter. It specifies bounds for the diameter values for the bins.
>
> Best wishes
>
> Jonathan
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Received on Mon Nov 29 2010 - 05:34:57 GMT
