Hello Klaus,
You are indeed correct - the CF "long_name" attribute contains a long
descriptive name that is non-standardised. It is optional, though its use
is highly recommended if there is no standard name.
Projects such as CMIP may, and do, insist on particular long names, but
that is entirely outside of the CF conventions. The description of a
standard name in the official table (e.g. "Mole fraction" is used in the
construction "mole_fraction_of_X_in_Y", where X, .....") provides the
precise definition of the quantity, but is not intended to be used as a
long name in netCDF datasets.
All the best,
David
On Wed, 13 Mar 2019 at 09:33, Klaus Zimmermann <klaus.zimmermann at smhi.se>
wrote:
> Good morning,
>
> just a technical clarification: long names are not standardized within
> cf, correct?
>
> Indeed, typical long names don't follow the snake_case convention, but
> are rather more free-form and human readable/understandable. They are
> chosen by the user, often giving information beyond the standard names.
>
> Examples from CMIP6 (Omon table, variables tos and tosga):
> tos:
> - standard name: sea_surface_temperature
> - long name: Sea Surface Temperature
> tosga:
> - standard name: sea_surface_temperature
> - long name: Global Average Sea Surface Temperature
>
> Cheers
> Klaus
>
>
> On 13/03/2019 10:11, Dan Say wrote:
> > Good morning,
> >
> >
> > I am happy to go with the IUPAC names if needs be however, hfc is
> > standard nomenclature and I would have thought the most likely term to
> > be searched. I also note that there are already standard names for
> > several HCFCs and CFCs, for which the standard names are
> > 'mole_fraction_of_cfc11_in_air' etc. Nevertheless, see below a list of
> > the requested standard/long names and definitions, using both HFC and
> > IUPAC nomenclature. I am happy for you to choose which ones we use,
> > please advise.
> >
> >
> > *HFC nomenclature:*
> >
> >
> > Standard name: mole_fraction_of_hfc134a_in_air
> >
> > Long name: mole_fraction_of_hfc134a_in_air
> >
> > Definition: Mole fraction is used in the construction
> > mole_fraction_of_X_in_Y, where X is a material constituent of Y. The
> > IUPAC name for hfc134a is 1,1,1,2-tetrafluoroethane.
> >
> >
> > Standard name: mole_fraction_of_hfc143a_in_air
> >
> > Long name: mole_fraction_of_hfc143a_in_air
> >
> > Definition: Mole fraction is used in the construction
> > mole_fraction_of_X_in_Y, where X is a material constituent of Y. The
> > IUPAC name for hfc143a is 1,1,1-trifluoroethane.
> >
> >
> > Standard name: mole_fraction_of_hfc125_in_air
> >
> > Long name: mole_fraction_of_hfc125_in_air
> >
> > Definition: Mole fraction is used in the construction
> > mole_fraction_of_X_in_Y, where X is a material constituent of Y. The
> > IUPAC name for hfc125 is 1,1,1,2,2-pentafluoroethane.
> >
> >
> > Standard name: mole_fraction_of_hfc152a_in_air
> >
> > Long name: mole_fraction_of_hfc152a_in_air
> >
> > Definition: Mole fraction is used in the construction
> > mole_fraction_of_X_in_Y, where X is a material constituent of Y. The
> > IUPAC name for hfc152a is 1,1-difluoroethane.
> >
> >
> > Standard name: mole_fraction_of_hfc32_in_air
> >
> > Long name: mole_fraction_of_hfc32_in_air
> >
> > Definition: Mole fraction is used in the construction
> > mole_fraction_of_X_in_Y, where X is a material constituent of Y. The
> > IUPAC name for hfc32 is difluoromethane.
> >
> >
> > Standard name: mole_fraction_of_hfc23_in_air
> >
> > Long name: mole_fraction_of_hfc23_in_air
> >
> > Definition: Mole fraction is used in the construction
> > mole_fraction_of_X_in_Y, where X is a material constituent of Y. The
> > IUPAC name for hfc23 is trifluoromethane.
> >
> >
> >
> >
> >
> > *IUPAC nomenclature:*
> >
> >
> > Standard name: mole_fraction_of_1,1,1,2-tetrafluoroethane_in_air
> >
> > Long name: mole_fraction_of_1,1,1,2-tetrafluoroethane_in_air
> >
> > Definition: Mole fraction is used in the construction
> > mole_fraction_of_X_in_Y, where X is a material constituent of Y.
> > 1,1,1,2-tetrafluoroethane is described by its common name, HFC-134a.
> >
> >
> > Standard name: mole_fraction_of_1,1,1-trifluoroethane_in_air
> >
> > Long name: mole_fraction_of_1,1,1-trifluoroethane_in_air
> >
> > Definition: Mole fraction is used in the construction
> > mole_fraction_of_X_in_Y, where X is a material constituent of Y.
> > 1,1,1-trifluoroethane is described by its common name, HFC-143a.
> >
> >
> > Standard name: mole_fraction_of_1,1,1,2,2-pentafluoroethane_in_air
> >
> > Long name: mole_fraction_of_1,1,1,2,2-pentafluoroethane_in_air
> >
> > Definition: Mole fraction is used in the construction
> > mole_fraction_of_X_in_Y, where X is a material constituent of Y.
> > 1,1,1,2,2-pentafluoroethane is described by its common name, HFC-125.
> >
> >
> > Standard name: mole_fraction_of_1,1-difluoroethane_in_air
> >
> > Long name: mole_fraction_of_1,1-difluoroethane_in_air
> >
> > Definition: Mole fraction is used in the construction
> > mole_fraction_of_X_in_Y, where X is a material constituent of Y.
> > 1,1-difluoroethane is described by its common name, HFC-152a.
> >
> >
> > Standard name: mole_fraction_of_difluoromethane_in_air
> >
> > Long name: mole_fraction_of_difluoromethane_in_air
> >
> > Definition: Mole fraction is used in the construction
> > mole_fraction_of_X_in_Y, where X is a material constituent of Y.
> > Difluoromethane is described by its common name, HFC-32.
> >
> >
> > Standard name: mole_fraction_of_trifluoromethane_in_air
> >
> > Long name: mole_fraction_of_trifluoromethane_in_air
> >
> > Definition: Mole fraction is used in the construction
> > mole_fraction_of_X_in_Y, where X is a material constituent of Y.
> > Trifluoromethane is described by its common name, HFC-23.
> >
> >
> >
> > Cheers,
> >
> >
> > Dan
> >
> >
> >
> > */________________________________
> > /*
> > */
> > /*
> > *Dr Daniel Say*
> > Postdoctoral Research Associate
> > Atmospheric Chemistry Research Group
> > School of Chemistry
> > University of Bristol
> > Tel: (+44) 117 3317042
> > ------------------------------------------------------------------------
> > *From:* Lowry, Roy K. <rkl at bodc.ac.uk>
> > *Sent:* 12 March 2019 17:17:12
> > *To:* Dan Say; cf-metadata at cgd.ucar.edu
> > *Subject:* Re: Addition of HFC standard names
> >
> > HI again,
> >
> > I'd prefer it to be somewhere in the Standard Name entry because that is
> > searchable either through the XML document on the CF site or through the
> > vocabulary servers handling Standard Names. That way your data gets
> > discovered by other communities who might search for
> > '1,1,1,2-tetrafluoroethane'. I've dealt with quite a few oceanographic
> > halocarbon data sets over the years, but had never come across the 'hfc'
> > nomenclature before.
> >
> > To my knowledge the long name doesn't get scraped by data discovery
> > systems. It is used more as usage metadata to help users better
> > understand the measurements. By all means include the IUPAC name in the
> > long name, but I would also keep the hfc synonym there.
> >
> > Cheers, Roy.
> >
> > I have now retired but will continue to be active through an Emeritus
> > Fellowship using this e-mail address.
> >
> >
> > ------------------------------------------------------------------------
> > *From:* Dan Say <dan.say at bristol.ac.uk>
> > *Sent:* 12 March 2019 16:59
> > *To:* Lowry, Roy K.; cf-metadata at cgd.ucar.edu
> > *Subject:* Re: Addition of HFC standard names
> >
> >
> > Hi Roy,
> >
> >
> > Would it make more sense to leave the standard name as suggested, but
> > replace 'hfc134a' with '1,1,1,2-tetrafluoroethane' in the long name, for
> > simplicity? This is my first venture into the CEDa archives so please
> > advise, I am happy to change the long names if needs be.
> >
> >
> > Cheers,
> >
> >
> > Dan
> >
> >
> > */________________________________
> > /*
> > */
> > /*
> > *Dr Daniel Say*
> > Postdoctoral Research Associate
> > Atmospheric Chemistry Research Group
> > School of Chemistry
> > University of Bristol
> > Tel: (+44) 117 3317042
> > ------------------------------------------------------------------------
> > *From:* Lowry, Roy K. <rkl at bodc.ac.uk>
> > *Sent:* 12 March 2019 16:56:17
> > *To:* Dan Say; cf-metadata at cgd.ucar.edu
> > *Subject:* Re: Addition of HFC standard names
> >
> > Dear Dan,
> >
> > I think it would be better to have the IUPAC names somewhere
> > (e.g. 1,1,1,2-tetrafluoroethane for hfc134a if Wikipedia is correct) in
> > the Standard Name entry. I'd be happy with it in the definition but
> > would not object to it being in the Standard Name itself.
> >
> > Cheers, Roy.
> >
> > I have now retired but will continue to be active through an Emeritus
> > Fellowship using this e-mail address.
> >
> >
> > ------------------------------------------------------------------------
> > *From:* CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of Dan
> > Say <dan.say at bristol.ac.uk>
> > *Sent:* 12 March 2019 16:43
> > *To:* cf-metadata at cgd.ucar.edu
> > *Subject:* [CF-metadata] Addition of HFC standard names
> >
> >
> > Dear All,
> >
> > I'd like to request an addition to the standard name list for
> > atmospheric measurements of hydrofluorocarbons HFC-134a, HFC-143a,
> > HFC-125, HFC-152a, HFC-32 and HFC-23. Here are the details of the
> > proposed standard names.
> >
> > Proposal for a new standard variable names:
> >
> > Names:
> > mole_fraction_of_hfc134a_in_air
> > mole_fraction_of_hfc143a_in_air
> > mole_fraction_of_hfc125_in_air
> > mole_fraction_of_hfc152a_in_air
> > mole_fraction_of_hfc32_in_air
> > mole_fraction_of_hfc23_in_air
> >
> > Description: Atmospheric measurements of hydrofluorocarbons (HFC) are
> > reported as mole fraction data in units of parts per trillion (ppt,
> > 1E-12). The long name will remain the same as the standard name.
> >
> > Thanks in advance,
> >
> > Dan
> >
> > */________________________________
> > /*
> > */
> > /*
> > *Dr Daniel Say*
> > Postdoctoral Research Associate
> > Atmospheric Chemistry Research Group
> > School of Chemistry
> > University of Bristol
> > Tel: (+44) 117 3317042
> >
> >
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