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, p...@llnl.gov, Lawrence Livermore National Lab. ----------------------------------------------------------------------- > -----Original Message----- > From: CF-metadata [mailto:cf-metadata-boun...@cgd.ucar.edu] On Behalf Of > Sander Niemeijer > Sent: Thursday, December 20, 2012 8:07 AM > To: Andreas Hilboll > Cc: cf-metadata@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 <li...@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. > > _______________________________________________ > > CF-metadata mailing list > > CF-metadata@cgd.ucar.edu > > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata > > _______________________________________________ > CF-metadata mailing list > CF-metadata@cgd.ucar.edu > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata