Articles | Volume 10, issue 7
https://doi.org/10.5194/amt-10-2669-2017
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, Andrew M. Crotwell, and Kirk W. Thoning

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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.