[CF-metadata] Clarifying standard names for 'mass_concentration_of_*_dry_aerosol_particles'

Steven Emmerson emmerson at ucar.edu
Mon Aug 14 08:37:45 MDT 2017


Greetings,

Just a reminder from an obsessive pedant who favors standards.

The terms "mass concentration" and "mass content", while they might be
well-understood in some scientific disciplines, aren't universally
understood in all scientific disciplines. FWIW, I recommend looking at what
Canada and the US have done regarding standard names for physical
quantities. Section 8.6.2 of <
https://www.nist.gov/physical-measurement-laboratory/nist-guide-si-chapter-8>
is a good starting point.

Regards,
Steve Emmerson

On Mon, Aug 14, 2017 at 3:48 AM, Daniel Neumann <
daniel.neumann at io-warnemuende.de> wrote:

> Just a brief reminder.
>
>
> On 24.07.2017 16:59, Daniel Neumann wrote:
>
>> Dear CF-Mailinglist,
>>
>> I suggest to rename all standard names (rename = create the new names and
>> make the old names aliases to the new ones)
>>
>> atmospheric_mass_content_of_X_dry_aerosol
>> to
>> atmospheric_mass_content_of_X_in_dry_aerosol
>>
>> and
>>
>> mass_concentration_of_X_dry_aerosol_in_air
>> to
>> mass_concentration_of_X_in_dry_aerosol_in_air
>>
>> and
>>
>> atmosphere_mass_content_of_sulfate_dry_aerosol_particles_expressed_as_sulfur
>>
>> to
>> atmosphere_mass_content_of_sulfate_in_dry_aerosol_particles_expressed_as_sulfur
>>
>>
>> I am not aware of any reasonable exceptions for X.
>>
>>
>> Further I would like to suggest to add
>>
>> atmospheric_mass_content_of_X_in_dry_aerosol
>> mass_concentration_of_X_in_dry_aerosol_in_air
>>
>> for chloride and sodium (units and descriptions according to the existing
>> other standard names of this type).
>>
>>
>> Reasons:
>> (a) As stated here (http://mailman.cgd.ucar.edu/p
>> ipermail/cf-metadata/2017/059588.html) and here (
>> http://mailman.cgd.ucar.edu/pipermail/cf-metadata/2017/059554.html), the
>> standard name mass_concentration_of_X_dry_aerosol describes the total
>> dry mass of all aerosol particles that contain traces of X. There is
>> currently no term to describe the mass concentration of particulate X.
>> (b) As stated here (http://mailman.cgd.ucar.edu/p
>> ipermail/cf-metadata/2017/059588.html) there is no practical application
>> or mass_concentration_of_X_dry_aerosol. However, for the CMIP5
>> experiments the standard name atmospheric_mass_content_of_X_dry_aerosol
>> is used to describe the mass content of particulate X (sulfate, nitrate,
>> ammonium) in the atmosphere. See standard_output.pdf on
>> http://cmip-pcmdi.llnl.gov/cmip5/output_req.html for details:
>> http://cmip-pcmdi.llnl.gov/cmip5/docs/standard_output.pdf . There are
>> probably more situation, in which mass_concentration_of_X_dry_aerosol
>> and atmospheric_mass_content_of_X_dry_aerosol were wrongly used. At
>> least I would have used it wrongly :-) .
>>
>> In order to (a) have valid standard names for the mass concentration (and
>> mass content) of particulate X and (b) be backward compatible with respect
>> to the current usage of existing standard names, I suggest to rename the
>> old variable names (create new one + make the old ones aliases to the new
>> ones) instead of just creating new ones (without alias-ing).
>>
>>
>> Regards,
>> Daniel
>> _______________________________________________
>> CF-metadata mailing list
>> CF-metadata at cgd.ucar.edu
>> http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
>>
>
> --
> Daniel Neumann
>
> Leibniz Institute for Baltic Sea Research Warnemuende
> Physical Oceanography and Instrumentation
> Seestrasse 15
> 18119 Rostock
> Germany
>
> phone:  +49-381-5197-287
> fax:    +49-381-5197-114 or 440
> e-mail: daniel.neumann at io-warnemuende.de
>
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>
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