Dear Roy and Beate, Thank you both for your replies (and for educating me about sea water partial pressures!)
The two new names are accepted as proposed: partial_pressure_of_carbon_dioxide_in_sea_water (Pa) '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.' partial_pressure_of_methane_in_sea_water (Pa) '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 methane is CH4.' These will be added at the next update of the standard name table, scheduled for 24th April. Best wishes, Alison ------ Alison Pamment Tel: +44 1235 778065 Centre for Environmental Data Analysis Email: [email protected] STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Campus, Didcot, OX11 0QX, U.K. From: Lowry, Roy K. [mailto:[email protected]] Sent: 30 March 2017 11:38 To: Pamment, Alison (STFC,RAL,RALSP); [email protected]; [email protected] Subject: Re: [CF-metadata] WG: proposal for two new standard_names and an additional chemical species Hi Alison, The 'in equilibrium' in pCO2 definition refers to the air in the analytical equipment and so has nothing to do with air-sea interface equilibrium. pCO2 is measured by using something like a shower-head or a column full of marbles to equilibrate the water sample with a stream of air that is then passed into a gas analyser. Consequently, the Standard Name makes no statement about the depth from which the water was taken. The same would apply to methane. Whilst it is usual to measure pCO2 in surface waters, I have come across measurements on water bottle samples collected at depth. Cheers, Roy. Please note that I partially retired on 01/11/2015. I am now only working 7.5 hours a week and can only guarantee e-mail response on Wednesdays, my day in the office. All vocabulary queries should be sent to [email protected]. Please also use this e-mail if your requirement is urgent. ________________________________________ From: CF-metadata <[email protected]> on behalf of [email protected] <[email protected]> Sent: 29 March 2017 12:34 To: [email protected]; [email protected] Subject: Re: [CF-metadata] WG: proposal for two new standard_names and an additional chemical species Dear Beate, Thank you for your proposals. As you have pointed out, we have an existing name 'surface_partial_pressure_of_carbon_dioxide_in_sea_water'. I completely agree that we should remove the sentence ' "Water" means water in all phases, including frozen i.e. ice and snow' from the definition as it really isn't necessary for this name. I will make that change in the April update to the standard name table. The definition of the existing name includes the sentence 'The partial pressure of a dissolved gas in sea water is the partial pressure in air with which it would be in equilibrium' so clearly this is talking about equilibrium of partial pressures across the air-sea interface, i.e. at the surface. For the proposed name partial_pressure_of_carbon_dioxide_in_sea_water do you mean partial pressures at some arbitrary depth below the sea surface, even if these are not actually in physical contact with the surface itself? If so, then I agree we do need a new name. For the methane name I would ask the same question. Certainly we can introduce a methane partial pressure name, but I'd like to understand whether it's at the surface or at some arbitrary depth. Best wishes, Alison ------ Alison Pamment Tel: +44 1235 778065 Centre for Environmental Data Analysis Email: [email protected] STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Campus, Didcot, OX11 0QX, U.K. From: CF-metadata [mailto:[email protected]] On Behalf Of [email protected] Sent: 20 February 2017 08:30 To: [email protected] Subject: [CF-metadata] WG: proposal for two new standard_names and an additional chemical species Dear all and especially the cf-metadata crew, My colleagues and I apply for an expansion of the table of chemical species (http://cfconventions.org/Data/cf-standard-names/docs/guidelines.html#id2799094): methane. We apply to include partial_pressure_of_methane_in_sea_water (units: Pa) with following description: 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 description of 'surface_partial_pressure_of_carbon_dioxide_in_sea_water' includes the sentence "Water" means water in all phases, including frozen i.e. ice and snow. which does not fit in this context - perhaps is an update possible here. We apply to include the additional standard_name partial_pressure_of_carbon_dioxide_in_sea_water (units: Pa) with the description 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 reason for this applications is the conversion of our measurement data to cf-conform netCDF. Thanks in advance for your help, Beate Geyer Institut für Küstenforschung Dr. Beate Geyer Regionale Atmosphären Modellierung Telefon : +49 4152 87-1871 Telefax : +49 4152 87-41871 ________________________________________ Helmholtz-Zentrum Geesthacht Zentrum für Material- und Küstenforschung GmbH Max-Planck-Straße 1 I 21502 Geesthacht I Deutschland/Germany Geschäftsführer/Board of Management: Prof. Dr. Wolfgang Kaysser, Dipl.-Ing. Michael Ganß Vorsitzender des Aufsichtsrates/Chairman of the Supervisory Board: Ministerialdirigent Dr. Herbert Zeisel Amtsgericht Lübeck HRB 285 GE (Register Court) Internet: http://www.hzg.de ________________________________________ _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata ________________________________________ This message (and any attachments) is for the recipient only. NERC is subject to the Freedom of Information Act 2000 and the contents of this email and any reply you make may be disclosed by NERC unless it is exempt from release under the Act. Any material supplied to NERC may be stored in an electronic records management system. ________________________________________ _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
