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 <maarten.sneep at knmi.nl> 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: maarten.sneep at knmi.nl
> R: A2.14
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