Dear Martin > if this is the direction to take, then we will need several "expressed_as" > standard_names for atmospheric chemistry. Typical example: volatile organic > compounds are often "expressed as" mass mixing ratio based on either their > molecular mass or in "grams C" which counts only the mass of the C atoms > (because this is what counts in the sense that it ultimately produces CO2 at > the end of the reaction chain). Hence, one would need things like > "mass_mixing_ratio_of_ethane_in_air_expressed_as_carbon_mass" and many > similar ones.
Yes, indeed, we have already started down this direction e.g. there is an existing standard name mass_fraction_of_brox_expressed_as_bromine_in_air > I do sympathize with people who prefer to read "nmol mol-1" on a plot rather > than "1" (or "1.e-9" in this case). Since nmol mol-1 is equal to 1e-9, there is no problem with using it as units in a CF file. It is udunits-compliant. It could even be stated as the canonical unit in the standard name table. Best wishes Jonathan _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
