Dear Paul,
I'm pretty sure the Canonical Unit should be Pascal, as with the existing partial pressure Standard Names. Note that this doesn't mean the data need to be in Pascals, it is just a way of expressing dimensionality in terms of SI. There is a field for the actual units of measure in the parameter attributes.
There are existing partial pressure Standard Names for CO2 and CH4, with partial pressure defined using the following text.
The partial pressure of a dissolved gas in sea water is the partial pressure in air with which it would be in equilibrium. The partial pressure of a gaseous constituent of air is the pressure which it alone would exert with unchanged temperature and number of moles per unit volume.
What is needed for fugacity is this with a description of the difference between partial pressure and fugacity. What do you think of the following?
Fugacity is the equivalent for a real gas to partial pressure for an ideal gas. The partial pressure of a dissolved gas in sea water is the partial pressure in air with which it would be in equilibrium. The partial pressure of a gaseous constituent of air is the pressure which it alone would exert with unchanged temperature and number of moles per unit volume.
Cheers, Roy.
I have now retired but will continue to be active through an Emeritus Fellowship using this e-mail address.
________________________________
From: CF-metadata <cf-metadata-bounces at cgd.ucar.edu> on behalf of Halloran, Paul <P.Halloran at exeter.ac.uk>
Sent: 20 September 2018 16:40
To: cf-metadata at cgd.ucar.edu
Subject: [CF-metadata] New name: fugacity of CO2
Dear mailing list,
I would like to propose a new standard name: ?fugacity_of_carbon_dioxide_in_sea_water?
Variable name: fCO2
Units: ?atm
Definition: The fugacity of CO2 is its effective partial pressure.
Thanks for your consideration of this,
Paul
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