Articles | Volume 10, issue 7
Atmos. Meas. Tech., 10, 2669–2685, 2017
https://doi.org/10.5194/amt-10-2669-2017
Atmos. Meas. Tech., 10, 2669–2685, 2017
https://doi.org/10.5194/amt-10-2669-2017

Research article 26 Jul 2017

Research article | 26 Jul 2017

Abundances of isotopologues and calibration of CO2 greenhouse gas measurements

Pieter P. Tans et al.

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AR by Andrew Crotwell on behalf of the Authors (26 May 2017)  Author's response    Manuscript
ED: Publish as is (14 Jun 2017) by Brigitte Buchmann
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Short summary
We describe a new CO2 calibration system for the Central Calibration Laboratory of the World Meteorological Organization Global Atmosphere Watch program. The system uses two laser spectroscopic instruments to measure the three major CO2 isotopologues individually. We account for isotopic differences between standards in the calibration hierarchy when assigning CO2 mole fraction, eliminating bias due to variations in the isotopic composition.