Dear Christiane, dear all,
Many thanks to you Christiane for your interesting comments. I waited a little bit before answer because there is an important discussion about pH in CF.
The truth is that the standard name attributes we are proposing are needed in the frame of MyOcean project, that is to say that there will be a large amount of new suggestions that will require your opinion and inputs! Then this is only a first sample, and not the last one..
Following your comments hereafter my feelings, also subject to Bruce Hackett and Laurence Crosnier appreciation (Bruce, feel free to correct me if you do not agree).
Comments
O Lauret
1) "volume_concentration_of_oxygen_in_sea_water"
You suggest now to add volume concentration. I think we should avoid to add too many expressions.
In your case, I assume that this is the common way to express this quantity in ocean science, but if not, could you possibly use one of the existing expressions?
? Yes you may be right, it is not absolutely necessary to introduce this "volume_concentration" expression. I noticed that CF rules allow the use of "volume_fraction_of_X_in_Y" that seems to reflect perfectly this quantity, especially in terms of dimensions. Then I suggest "volume_fraction_of_oxygen_in_sea_water" instead. Bruce, Laurence, do you agree with that?
2) "ratio_of_nitrate_to_phosphate_in_sea_water"
Does this refer name to the mass or volume or mole ratio?
? I guess it doesn't really matter, because of the ratio (mass ratio is equal to volume ratio anyway)?
3) The post fix "in_sea_water"
All your names refer to quantities in the ocean which is a large scale medium, not a local one. I guess a local medium in the oean would rather be something like in_air if a tracer is contained in air bubbles in the ocean. I am not sure how to deal with this, but should ocean_ (or sea_water_) not be used as a prefix with the post fix deleted?
? I agree with that, but all the existing ocean/sea water ones are built in that way, with sea_water as post fix.. Within CF 'ocean part' there seems not to have (yet) the same interesting distinction you underlined for atmospheric sciences.
Thanks to all of you for your feedback.
Best regards,
Olivier.
Olivier LAURET
Project Engineer
Space Oceanography Division
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-----Message d'origine-----
De : Christiane Textor [mailto:christiane.textor at lsce.ipsl.fr]
Envoy? : jeudi 30 avril 2009 15:41
? : olivier lauret; CF-metadata email list
Objet : Re: [CF-metadata] Proposal for additional CF biogeochemistry attributes
Dear Olivier,
As an atmospheric chemist I have three remarks on your list:
1) volume_concentration_of_oxygen_in_sea_water [vol/vol]
For atmospheric chemistry we have defined the following measures to
express a tracers' abundance:
mass_concentration [kg/m3]
mole_concentration [mole/m3]
mole_fraction [mole/mole]
moles [moles]
You suggest now to add volume concentration. I think we should avoid to
add too many expressions.
In your case, I assume that this is the common way to express this
quantity in ocean science, but if not, could you possibly use one of the
existing expressions?
2) ratio_of_nitrate_to_phosphate_in_sea_water
Does this refer name to the mass or volume or mole ratio?
3) The post fix in_sea_water
All your names refer to quantities in the ocean which is a large scale
medium, not a local one. I guess a local medium in the oean would rather
be something like in_air if a tracer is contained in air bubbles in the
ocean. I am not sure how to deal with this, but should ocean_ (or
sea_water_) not be used as a prefix with the post fix deleted?
Best regards,
Christiane
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