Maarten, According to section 8.6.2 of this NIST webpage <http://physics.nist.gov/Pubs/SP811/sec08.html>, you should try to convince your colleagues to use the label "NO2 Concentration", for which the SI unit is, indeed, "mol/m3".
With apologies for being blunt, I'm loath to force the UDUNITS package to accommodate idiosyncratic science. In my opinion, a better solution is to have a separate package that "corrects" the view of the data as seen by the analysis package. Modifying the UDUNITS package holds no hope for improving science, while accommodating idiosyncratic metadata via a transitional lens does. Ply me with whisky and I might change my mind. :-) Regards, Steve Emmerson On Wed, Jan 7, 2015 at 8:33 AM, Maarten Sneep <[email protected]> wrote: > On 07-01-15 16:15, Jonathan Gregory wrote: > >> Dear Maarten >> >> A mole is also a udunit, so mol m-3 and m-3 are different units, and >> quantities >> with those canonical units also have to have different standard_names. The >> standard_name indicates whether the quantity refers to number >> concentration or >> molar concentration. I am not sure if I've understood you correctly. >> > > No, I don't think you have. > > 1e15 molecules/cm2 NO2 is a valid column amount for NO2, but at the same > time I'm trying to convince my colleagues that this quantity should be > expressed in mol/m2 (specifically 16.6 micromol/m2 for said column amount). > These express the same quantity and should _not_ use different standard > names, not in the case of molecules. In the end the number density should > become extinct for molecular species, switching completely to mol based > units. Having different standard names will only serve to hinder the > transition. > > Kind regards, > > Maarten Sneep > > -- > KNMI > T: 030 2206747 > E: [email protected] > R: A2.14 > _______________________________________________ > CF-metadata mailing list > [email protected] > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata >
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