[CF-metadata] aerosol water

[Christiane Textor]

Hi Jonathan,

 > OK, I see there could be a distinction between in_air and in_cloudy_air.

and in_clouds or in_snow etc...


 > Do you need the "ambient"?
I think I do need the ambient, because it could also be given at a 
certain rel. hum.

 >You draw a distinction with "dry aerosol", > but you wouldn't find 
"dry >aerosol" in air.

Yes I would: in the model world.

 > Doesn't "dry aerosol" mean you have
 > collected and dried it, and that the water mass fraction is zero?
 >
This is the meaning in the real world.

 > If aerosol particles are in cloud water or in precipitation, are they 
still "ambient" aerosol? Do they still have a meaningful mass fraction 
of water?

This distinction would not make sense anymore. It could be dry or 
ambient aerosol in air, or aerosol at a certain rel. humidity in air. Or 
they could be contained another phase like clouds or precip, but not at 
the same time in air.

Cheers,

Christiane


Jonathan Gregory a écrit :
> Dear Christiane
> 
> 
>>>>mass_fraction_of_water_in_ambient_aerosol_in_air
>>>
>>>isn't an aerosol by definition in air?
>>
>>Aerosol particles can be within hydrometeors (cloud, precip, ice...), so 
>>I would like to keep the in_air extension.
> 
> 
> OK, I see there could be a distinction between in_air and in_cloudy_air.
> 
> Do you need the "ambient"? You draw a distinction with "dry aerosol", but you
> wouldn't find "dry aerosol" in air. Doesn't "dry aerosol" mean you have
> collected and dried it, and that the water mass fraction is zero?
> 
> If aerosol particles are in cloud water or in precipitation, are they still
> "ambient" aerosol? Do they still have a meaningful mass fraction of water?
> 
> Thanks for continuing the discussion. Cheers
> 
> Jonathan
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-- 
Christiane Textor
GMES France Atmosphère - GEMS France
Service d'Aéronomie INSU CNRS, Tour 46, RDC # 2
Université Pierre et Marie Curie, Boite 102
4 place Jussieu
75252 Paris Cédex 05
France

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Email: christiane.textor at aero.jussieu.fr