Hi All,
All of the std_names that count atoms and molecules currently have canonical units that use moles and meters, so I would want to continue that.
I had not realized that udunits did not include molecules.
To the udunits experts: How hard is it to add 'molecules' permanently, using the information Sander provides below?
Best wishes,
Philip
-----------------------------------------------------------------------
Dr Philip Cameron-Smith, pjc at llnl.gov, Lawrence Livermore National Lab.
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> -----Original Message-----
> From: CF-metadata [mailto:cf-metadata-bounces at cgd.ucar.edu] On Behalf Of
> Sander Niemeijer
> Sent: Thursday, December 20, 2012 8:07 AM
> To: Andreas Hilboll
> Cc: cf-metadata at cgd.ucar.edu
> Subject: Re: [CF-metadata] Proposal for standard names: tropospheric trace gas
> column amounts
>
> I think we should be careful with this. There is a big (order of magnitude)
> difference between 'mole' and 'molecule'.
>
> I am rather new to this mailing list, so I am not sure what the impact of this
> difference between mole and molecules would mean in terms of naming the
> variables.
>
> In the atmospheric community the standard is indeed to use 'molecules / cm^2'
> and not 'mole / cm^2', so IMO using the term 'mole' in the standard name would
> be quite confusing.
>
> In any case I am also quite interested to know what the proper standard names
> for these quantities should be.
>
> Also note that udunits does not support 'molecules'. In one of our projects we
> are currently using the following custom udunits definition to support this:
>
> <unit>
> <def>mol/6.02214179e23</def>
> <name>
> <singular>molecule</singular>
> <plural>molecules</plural>
> </name>
> <aliases>
> <name><singular>molec</singular></name>
> </aliases>
> </unit>
>
> Best regards,
> Sander
>
>
> On 20 dec. 2012, at 16:41, Andreas Hilboll <lists at hilboll.de> wrote:
>
> > Hi all,
> >
> > following the suggestion from Philip, I hereby propose the addition of
> > the following standard names. All are commonly used quantities used in
> > satellite remote sensing of atmospheric trace gases, and all are
> > commonly used in units of "molecules / cm^2":
> >
> > - stratosphere_mole_content_of_nitrogen_dioxide
> > - troposphere_mole_content_of_nitrogen_dioxide
> > - troposphere_mole_content_of_glyoxal
> > - troposphere_mole_content_of_formaldehyde
> > - troposphere_mole_content_of_iodine_monoxide
> > - troposphere_mole_content_of_bromine_monoxide
> > - troposphere_mole_content_of_sulfur_dioxide
> > - troposphere_mole_content_of_ozone
> >
> > The respective definitions could be something along the lines of
> > (borrowing from Christophe's ozone proposal):
> >
> > "Content" indicates a quantity per unit area. The
> > "troposphere/stratosphere content"
> > of a quantity refers to the vertical integral from the surface to the
> > tropopause / from the tropopause to the stratopause. For the content
> > between specified levels in the atmosphere, standard names including
> > content_of_atmosphere_layer are used. The construction
> > "atmosphere_mole_content_of_X" means the vertically integrated number
> > of moles of X above a unit area. The chemical formula for
> > nitrogen_dioxide / glyoxal / formaldehyde / iodine_monoxide /
> > bromine_monoxide / suflur_dioxide / ozone is NO2 / CHOCHO / HCHO / IO
> > / BrO / SO2 / O3. The IUPAC name for glyoxal / formaldehyde / ozone is
> > ethanedial / methanal / trioxygen.
> >
> > Cheers,
> > Andreas.
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Received on Fri Dec 21 2012 - 19:28:31 GMT
