Dear All,
I agree with the proposed inclusion of "in_sea_water_excluding_solutes_and_solids", but suggest a slightly different description, because the phrase "composition of the sea water medium itself" does not look explicit enough (in the discussion below Jonathan appears to use "medium" with a broader meaning). The description could be perhaps be improved by referring to the "chemical compound water", e.g.: 'The phrase "in_sea_water_excluding_solutes_and_solids" means that the standard name refers only to the chemical compound water and does not include material that may be dissolved or suspended in the aqueous medium'. regards, Martin ________________________________ From: CF-metadata <[email protected]> on behalf of Alison Pamment - UKRI STFC <[email protected]> Sent: 10 May 2018 14:07 To: [email protected] Subject: Re: [CF-metadata] PMIP Standard names: isotopic fluxes, mass contents and ratios. Dear Jonathan and Karl, Thank you both for making suggestions to improve the isotope ratio in sea water names. I think Jonathan's suggestion of isotope_ratio_of_18O_to_16O_in_sea_water_excluding_solutes_and_solids is the clearest. We do use 'excluding_X' in some existing names, so it is an established syntax, and writing it in full leaves little room for doubt as to what is intended. I will change the names and definitions to the following: isotope_ratio_of_18O_to_16O_in_sea_water_excluding_solutes_and_solids (1) 'The phrase "ratio_of_X_to_Y" means X/Y. The phrase "isotope_ratio" is used in the construction isotope_ratio_of_A_to_B where A and B are both named isotopes. It means the ratio of the number of atoms of A to the number of atoms of B present within a medium. "O" means the element "oxygen" and "18O" is the stable isotope "oxygen-18". "16O" is the stable isotope "oxygen-16". The phrase "in_sea_water_excluding_solutes_and_solids" means that the standard name refers to the composition of the sea water medium itself and does not include material that may be dissolved or suspended in the medium.' isotope_ratio_of_17O_to_16O_in_sea_water_excluding_solutes_and_solids (1) 'The phrase "ratio_of_X_to_Y" means X/Y. The phrase "isotope_ratio" is used in the construction isotope_ratio_of_A_to_B where A and B are both named isotopes. It means the ratio of the number of atoms of A to the number of atoms of B present within a medium. "O" means the element "oxygen" and "17O" is the stable isotope "oxygen-17". "16O" is the stable isotope "oxygen-16". The phrase "in_sea_water_excluding_solutes_and_solids" means that the standard name refers to the composition of the sea water medium itself and does not include material that may be dissolved or suspended in the medium.' These names are already accepted and will still be added in the May update. There is one other isotope ratio name (proposal 12). The name itself should match the others, so it should be written: isotope_ratio_of_2H_to_1H_in_sea_water_excluding_solutes_and_solids (1) This name is still under discussion, pending clarification of whether '2H' includes water composed of both HDO and D2O. Best wishes, Alison ------ Alison Pamment Tel: +44 1235 778065 NCAS/Centre for Environmental Data Archival Email: [email protected] STFC Rutherford Appleton Laboratory R25, 2.22 Harwell Oxford, Didcot, OX11 0QX, U.K. -----Original Message----- From: CF-metadata [mailto:[email protected]] On Behalf Of Jonathan Gregory Sent: 08 May 2018 15:27 To: [email protected] Subject: [CF-metadata] PMIP Standard names: isotopic fluxes, mass contents and ratios. Dear Martin and Alison > > 10, 11: yes, this is the ratio of oxygen isotope atoms in the sea > > water molecules. It is true that "sea_water" generally refers to the water > > and the material dissolved and suspended in it, so these names are perhaps > > confusing. Perhaps is should be > > isotope_ratio_of_18O_to_16O_in_sea_water_molecules? I appreciate this difficulty, but I think that the distinction between in_sea_water and in_sea_water_molecules wouldn't be easily grasped. Since "sea water" is the name of the medium, all the molecules in it (including those of compounds dissolved and suspended) are "sea water molecules" in some sense. Maybe we could be more explicit e.g. isotope_ratio_of_18O_to_16O_in_sea_water_excluding_solutes_and_solids Best wishes Jonathan _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata _______________________________________________ CF-metadata mailing list [email protected] http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
