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-Sch?ch" [armin.rauthe-schoech at mpic.de]
Sent: 15 December 2014 10:36
To: cf-metadata at 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-Sch?ch
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-schoech at mpic.de
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Received on Mon Dec 15 2014 - 04:06:46 GMT
