Articles | Volume 11, issue 10
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


Interactive discussion

Status: closed
Status: closed
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision
AR by M.F. Schibig on behalf of the Authors (03 Aug 2018)  Author's response    Manuscript
ED: Publish as is (24 Aug 2018) by Brigitte Buchmann
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.