Dear Sebastien,
One option would be to include in cell_methods the following:
cell_methods = "depth: mean (from surface to sea floor)"
where depth is the standard name for the vertical coordinate, as
provided for? in
http://cfconventions.org/Data/cf-conventions/cf-conventions-1.7/cf-conventions.html#cell-methods-no-coordinates
, and the information in parentheses is non-standard, as provided for in
http://cfconventions.org/Data/cf-conventions/cf-conventions-1.7/cf-conventions.html#recording-spacing-original-data
.
I, for one, wouldn't like to see every integral over an entire domain to
require a new standard_name.? the standard_names should name the
variable itself and not indicate "method".
best wishes,
Karl
On 4/11/18 10:28 AM, Jonathan Gregory wrote:
> Dear Sebastien
>
> There is an existing standard name of
> ocean_integral_wrt_depth_of_sea_water_temperature
> and the one you propose has the same pattern, so it would seem all right to me,
> and appropriate for your purpose. Otherwise you could set a very large lower
> depth boundary with the understanding that integrating below the sea floor
> added nothing, but that's a bit ugly.
>
> Best wishes
>
> Jonathan
>
> ----- Forwarded message from Sebastien Villaume <sebastien.villaume at ecmwf.int> -----
>
>> Date: Wed, 11 Apr 2018 13:57:48 +0000
>> From: Sebastien Villaume <sebastien.villaume at ecmwf.int>
>> To: cf-metadata at cgd.ucar.edu
>> Subject: [CF-metadata] use of
>> integral_wrt_depth_of_sea_water_practical_salinity
>> X-Mailer: Zimbra 8.6.0_GA_1200 (ZimbraWebClient - FF57 (Linux)/8.6.0_GA_1200)
>>
>> Dear list,
>>
>> In 2016/2017, a list of new standard names for NEMO output has been proposed and accepted : http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2016/058964.html
>>
>> from that initial list of standard names and after many iterations, one of the accepted standard name was:
>>
>> standard name: integral_wrt_depth_of_sea_water_practical_salinity
>> units: m
>>
>> But the initial list of proposed standard names had actually 2 entries for this standard name:
>>
>> - one entry which is the one that eventually made it to the list (the standard name above)
>> - a second entry for the case where the depth is the total depth, from surface to sea floor: ocean_integral_wrt_depth_of_sea_water_practical_salinity
>>
>> During the discussion:
>> - Alison argued that the 2 entries were actually identical, the second one being simply a special case of the first one, i.e. when the depth corresponds to the total depth. She proposed later on to simply dropped the second entry.
>> - Antonio Cofino argued that in this case the reference to Axis and to bounds should be removed from the description because in the case of the total depth, the bounds are not a constant (but function of lat and lon)
>>
>> In the published description the reference to an axis and to bounds is still there.
>>
>>
>>
>> My immediate problem is that I want to produce a parameter that is the integral wrt the whole depth of the salinity and I don't know how to do this.
>>
>> for a fixed depth of 500m for instance, the metadata for the parameter would be:
>>
>> float salinity500(t, y, x) ;
>> salinity500:standard_name = "integral_wrt_depth_of_sea_water_practical_salinity" ;
>> salinity500:units = "m" ;
>> salinity500:coordinates = "time dpt500 latitude longitude" ;
>> float dpt500 ;
>> dpt500:standard_name = "depth_below_geoid" ;
>> dpt500:units = "m" ;
>> dpt500:axis = "Z" ;
>> dpt500:positive = "down" ;
>> dpt500:bounds = dpt500_bnds ;
>> float dpt500_bnds(bnds) ;
>>
>> and in the dpt500_bnds array, I have : [0., 500.]
>>
>> for the total depth, I can't use the same mechanism, because the second value of the bounds is not a constant, it is a function of lat and lon: [0., f(lat,lon)]
>>
>>
>> How can I solve this?
>>
>> Is it possible to reconsider the standard name ocean_integral_wrt_depth_of_sea_water_practical_salinity (or a variation of it)?
>> Another approach could be to keep the existing standard name, add a new standard name that represents the total water column and use it as an auxiliary coordinate.
>>
>> thanks,
>> ____________________________________
>>
>> Dr. S?bastien Villaume
>>
>> M.A.R.S. Analyst
>> ECMWF Data Governance facilitator
>>
>> ECMWF
>> Shinfield Park,
>> Reading RG2 9AX, UK
>> +44 (0)118 949 9301
>> +44 (0)7825 521592
>> sebastien.villaume at ecmwf.int
>> ____________________________________
>> _______________________________________________
>> CF-metadata mailing list
>> CF-metadata at cgd.ucar.edu
>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
> ----- End forwarded message -----
> _______________________________________________
> CF-metadata mailing list
> CF-metadata at cgd.ucar.edu
> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
Received on Wed Apr 11 2018 - 11:45:07 BST
