Articles | Volume 11, issue 10
https://doi.org/10.5194/amt-11-5565-2018
https://doi.org/10.5194/amt-11-5565-2018
Research article
 | 
12 Oct 2018
Research article |  | 12 Oct 2018

Experiments with CO2-in-air reference gases in high-pressure aluminum cylinders

Michael F. Schibig, Duane Kitzis, and Pieter P. Tans

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Latest update: 23 Feb 2024
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Short summary
For long-term monitoring of CO2 in the atmosphere it is crucial that standard reference gas mixtures stored in high-pressure aluminum cylinders, used to calibrate global measurements, remain stable over their whole time of use. This study finds a reproducible small enrichment as a cylinder is emptied at a low-flow rate, as well as somewhat larger and variable effects when a cylinder is emptied using a high-flow rate.