Hello Armin, enrichment_of_13C_in_carbon_dioxide_in_air_with_respect_to_vienna_peedee_belemnite
I have been using the phrase 'enrichment of 13C' in parameter controlled vocabularies for 'delta-13C' which is subtly different from a simple isotopic difference. From your usage of 'per mil' it looks to me that your measured parameter is 'delta'. I would also include the description of delta ((isotopic ratio in sample/isotopic ratio in standard) - 1) * 1000 in the definition. Cheers, Roy. ________________________________________ From: "Armin Rauthe-Schöch" [armin.rauthe-scho...@mpic.de] Sent: 15 December 2014 10:36 To: cf-metadata@cgd.ucar.edu Subject: [CF-metadata] Standard names for isotopic ratios ? Dear all, I'm working with atmospheric aircraft data from the CARIBIC project (http://www.caribic.de/). When changing to a new file format, we decided to include CF standard names for our measurements. Now I'm looking for CF standard names for the 13C and 18O isotope ratios of CO2 in the atmosphere and of the deuterium content of water vapor in the atmosphere. These ratios are usually expressed with a unit of per mil which would translate to a UDunits compatible unit of "1e-3". But I did not find any isotopic ratios in the CF standard name table v27. Is this correct ? What would a suitable CF standard name look like ? name: difference_of_isotope_ratio_of_13C_in_carbon_dioxide_in_air_from_vienna_peedee_belemnite unit: 1e-3 definition: Difference of the isotopic ratio of the carbon isotope 13C in carbon dioxide in a measurement relative to the same ratio in the Vienna Peedee-belemnite standard. In the same way, I would need: difference_of_isotope_ratio_of_18O_in_carbon_dioxide_in_air_from_vienna_peedee_belemnite difference_of_isotope_ratio_of_deuterium_in_water_vapor_from_vienna_standard_mean_ocean_water I'm just guessing here, could someone with more knowledge please help me here ? Thanks and best regards, Armin -- Dr. Armin Rauthe-Schöch Max Planck Institute for Chemistry Department of Atmospheric Chemistry Hahn-Meitner-Weg 1 D-55128 Mainz / GERMANY Tel. +49-6131-305-4123 Fax. +49-6131-305-4009 Email: armin.rauthe-scho...@mpic.de _______________________________________________ CF-metadata mailing list CF-metadata@cgd.ucar.edu 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 CF-metadata@cgd.ucar.edu http://mailman.cgd.ucar.edu/mailman/listinfo/cf-metadata
