Dear Jonathan,
Instead of 'moist' I would suggest 'ambient'. This would be consistent
with 'ambient' aerosol.
In addition, the mass fraction of water vapor in dry air is not zero,
this is possible and used in models.
I am not sure, if 'air' means dry_air to everybody, I would assume that
some take it as dry_air. Therefore I would suggest to always add dry or
ambient, also for the chemical constituents.
Best regards,
Christiane
Jonathan Gregory schrieb:
Dear Alison et al.
I wrote
I think we could include both of these:
'water_vapour_mixing_ratio'
'mass_fraction_of_water_vapour_in_dry_air'
They are different quantities, and people should use the one which describes
their data.
That was wrong, sorry, I wasn't thinking.
Shouldn't the second option be
mass_fraction_of_water_vapour_in_moist_air
or just
mass_fraction_of_water_vapour_in_air
assuming that "air" means just as it comes i.e. not dry? The mass fraction
of water vapour in dry air is zero. I think
mass_fraction_of_water_vapour_in_[moist_]air
water_vapour_mixing_ratio
are two different quantities, which should have different standard names. If
A is the mass of water vapour and B is the mass of dry air, the mixing ratio
is A/B and the mass fraction is A/(A+B), I believe. I think the mass fraction
is what we use for other chemical constituents. If C is the mass of some other
species, the mass fraction of C in air is C/(A+B), because "air" would be
assumed to be ambient, including whatever moisture A it has.
Best wishes
Jonathan
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Christiane Textor
Laboratoire des Sciences du Climat et de l'Environnement
Unite Mixte de Recherche CEA-CNRS-UVSQ
LSCE/IPSL, CEA Saclay, Orme des Merisiers,
Bat. 701, Piece 3b, Point Courrier 129
F-91191 Gif-sur-Yvette Cedex
FRANCE
mailto: [EMAIL PROTECTED]
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GEOmon scientific coordinator http://www.geomon.eu
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