Dear Paul, Jim, Roy, Thanks for looking at this name again. I too agree that Jim's wording of the partial pressure description is an improvement. So we now have: fugacity_of_carbon_dioxide_in_sea_water (Canonical units: Pa) 'The fugacity is the measured pressure (or partial pressure) of a real gas corrected for the intermolecular forces of that gas, which allows that corrected quantity to be treated like the pressure of an ideal gas in the ideal gas equation PV = nRT. 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 that it would exert if all other gaseous constituents were removed, assuming the volume, the temperature, and its number of moles remain unchanged. The chemical formula for carbon dioxide is CO2.'
This name is accepted for publication in the standard name table and will be added in the 15th October update. I agree with Roy's comment that the definitions of existing partial pressure names should also be updated with the improved text. This will affect the following 12 names: partial_pressure_of_carbon_dioxide_in_sea_water; partial_pressure_of_methane_in_sea_water; surface_carbon_dioxide_abiotic_analogue_partial_pressure_difference_between_sea_water_and_air; surface_carbon_dioxide_natural_analogue_partial_pressure_difference_between_sea_water_and_air; surface_carbon_dioxide_partial_pressure_difference_between_air_and_sea_water; surface_carbon_dioxide_partial_pressure_difference_between_sea_water_and_air; surface_molecular_oxygen_partial_pressure_difference_between_sea_water_and_air; surface_partial_pressure_of_carbon_dioxide_abiotic_analogue_in_sea_water; surface_partial_pressure_of_carbon_dioxide_in_air; surface_partial_pressure_of_carbon_dioxide_in_sea_water; surface_partial_pressure_of_carbon_dioxide_natural_analogue_in_sea_water; water_vapor_partial_pressure_in_air. These definitions will also be updated on 15th October. Best wishes, Alison ------ Alison Pamment Tel: +44 1235 778065 NCAS/Centre for Environmental Data Archival Email: alison.pamm...@stfc.ac.uk STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Oxford, Didcot, OX11 0QX, U.K. From: Lowry, Roy K. <r...@bodc.ac.uk> Sent: 05 October 2018 14:44 To: James Orr <james....@lsce.ipsl.fr>; Pamment, Alison (STFC,RAL,RALSP) <alison.pamm...@stfc.ac.uk> Cc: 'Halloran, Paul' <p.hallo...@exeter.ac.uk>; cf-metadata@cgd.ucar.edu Subject: Re: [CF-metadata] New name: fugacity of CO2 Dear All, I'm happy with James's updated sentence. It says the same thing but is clearer. Once the fCO2 name has been added we could consider using it to upgrade other partial pressure definitions. I think the last sentence is there to conform to a definition pattern that includes some less familiar substances. I'm equally happy with it or without it. Cheers, Roy. I have now retired but will continue to be active through an Emeritus Fellowship using this e-mail address. ________________________________________ From: CF-metadata on behalf of James Orr Sent: 05 October 2018 14:26 To: Alison Pamment - UKRI STFC Cc: 'Halloran, Paul'; mailto:cf-metadata@cgd.ucar.edu Subject: Re: [CF-metadata] New name: fugacity of CO2 Hi Allison, Paul, Roy, et al., I would suggest to replace the 3rd sentence "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." with the following: "The partial pressure of a gaseous constituent of air is the pressure that it would exert if all other gaseous constituents were removed, assuming the volume, the temperature, and its number of moles remain unchanged." The description would then become as follows: 'The fugacity is the measured pressure (or partial pressure) of a real gas corrected for the intermolecular forces of that gas, which allows that corrected quantity to be treated like the pressure of an ideal gas in the ideal gas equation PV = nRT. 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 that it would exert if all other gaseous constituents were removed, assuming the volume, the temperature, and its number of moles remain unchanged. The chemical formula for carbon dioxide is CO2.' In addition, is the last sentence useful given that it is common knowledge? Thanks, Jim On Thu, 4 Oct 2018, Alison Pamment - UKRI STFC wrote: > Dear Paul, > > Thank you for proposing this new standard name and thanks also to Roy, Jim > and Jonathan for their comments. > > I think the proposal as it now stands is: > fugacity_of_carbon_dioxide_in_sea_water (Canonical units: Pa) > 'The fugacity is the measured pressure (or partial pressure) of a real gas > corrected for the intermolecular forces of that gas, which allows that > corrected quantity to be treated like the pressure of an ideal gas in the > ideal gas equation PV = nRT. 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. The chemical formula for carbon dioxide is CO2.' > > Paul, please can you confirm if this is all okay? If so, I think the name can > be accepted and included in the next update to the table. > > Best wishes, > Alison > > ------ > Alison Pamment Tel: +44 1235 778065 > NCAS/Centre for Environmental Data Archival Email: > mailto:alison.pamm...@stfc.ac.uk > STFC Rutherford Appleton Laboratory > R25, 2.22 > Harwell Oxford, Didcot, OX11 0QX, U.K. > > > -----Original Message----- > From: CF-metadata On Behalf Of Halloran, Paul > Sent: 26 September 2018 12:59 > To: mailto:cf-metadata@cgd.ucar.edu > Subject: Re: [CF-metadata] New name: fugacity of CO2 > > Thanks very much Jim. > > Just to clarify (in light of Jim's second point), my argument around air-sea > CO2 flux which I put forward to support my suggestion that we include > fugacity is that an imprecise conversion from fugacity of CO2 to pCO2 to > allow one to submit data as a compliant netcdf (due to potentially not having > the the other required variables available at the correct frequency), while > likely to only result in small numerical errors could have bigger > implications if then used to calculate air-sea CO2 flux. > > Thanks, > Paul > >> Hi Paul, Roy, et al., >> >> A couple of points regarding fugacity. >> >> 1) In the proposed definition of fugacity, the first sentence could be >> misunderstood. I suggest changing it to the following: >> >> The fugacity is the measured pressure (or partial pressure) of a real >> gas corrected for the intermolecular forces of that gas, which allows >> that corrected quantity to be treated like the pressure of an ideal >> gas in the ideal gas equation PV = nRT. >> >> 2) The air-sea flux of a gas does not depend on its fugacity, only its >> partial pressure (i.e., in both the atmosphere and ocean). >> >> Cheers, >> >> Jim > _______________________________________________ > CF-metadata mailing list > mailto:CF-metadata@cgd.ucar.edu > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata mailman.cgd.ucar.edu This is an unmoderated list for discussions about interpretation, clarification, and proposals for extensions or change to the CF conventions. > > _______________________________________________ > CF-metadata mailing list > mailto:CF-metadata@cgd.ucar.edu > http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata -- LSCE/IPSL, Laboratoire des Sciences du Climat et de l'Environnement CEA-CNRS-UVSQ LSCE/IPSL, CEA Saclay http://www.ipsl.jussieu.fr/~jomce Bat. 712 - Orme mailto: mailto:james....@lsce.ipsl.fr Point courrier 132 F-91191 Gif-sur-Yvette Cedex Phone: (33) (0)1 69 08 39 73 FRANCE Fax: (33) (0)1 69 08 30 73 ________________________________________ This message (and any attachments) is for the recipient only. 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