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

Daniel Neumann daniel.neumann at io-warnemuende.de
Mon Jul 24 08:59:35 MDT 2017


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/pipermail/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/pipermail/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



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