[CF-metadata] Correct name for aerosol size distributionexpressedin numbers ?

From: Jonathan Gregory <j.m.gregory>
Date: Sat, 27 Nov 2010 14:21:10 +0000

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
Received on Sat Nov 27 2010 - 07:21:10 GMT