[CF-metadata] Proposal for additional CF biogeochemistry attributes

[Philip Cameronsmith]

Hi Bruce,

In the atmosphere CF has used 'mole_fraction_' to designate mole/mole 
quantities.

Hence, perhaps we should use 
MOLE_FRACTION_of_nitrate_to_phosphate_in_sea_water here?

The counter argument is that, in every existing CF std name I could find,
mol_fraction_ is always the mole ratio of the species to air.

Hence, I think the question boils down to: Do we want to create a new 
prefix (ie 'mole_ratio_') for ratios of species to species (as opposed to 
the ratio of species to medium)?

Best wishes,

      Philip


On Tue, 12 May 2009, Bruce Hackett wrote:

> Hi, 
>
> I was too quick in my last msg, sorry. Got to thinking about the n/p ratio and checked it out with the people who programmed it. It is the ratio of mole concentrations that we are calculating and putting into netCDF files. That's what we suggest establishing a standard_name for. 
>
> Our motivation is that marine biologists use the N/P ratio, calculated in this way. (They also seem to prefer expressing oxygen concentration in ml/l, by the way.)
>
> Should we change the proposed name to "mole_ratio_of_nitrate_to_phosphate_in_sea_water"?
>
> Cheers, 
> Bruce
>
> ----- "Philip J. Cameronsmith1" <cameronsmith1 at llnl.gov> wrote:
>
>> On Mon, 11 May 2009, olivier lauret wrote:
>> 
>> >> 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)?
>> 
>> Hi,
>> 
>> I'm not sure what volume_ratio means in the ocean, but surely
>> mass_ratio 
>> and mole_ratio will be different?
>> 
>> Best wishes,
>>
>>       Philip
>
> -- 
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>   Bruce Hackett                         Senior Scientist
>   Norwegian Meteorological Institute (met.no), R & D Dept.
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------------------------------------------------------------------------
Dr Philip Cameron-Smith        Atmospheric, Earth, and Energy Division
pjc at llnl.gov                   Lawrence Livermore National Laboratory
+1 925 4236634                 7000 East Avenue, Livermore, CA94550, USA
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