Articles | Volume 12, issue 2
https://doi.org/10.5194/amt-12-1013-2019
https://doi.org/10.5194/amt-12-1013-2019
Research article
 | 
15 Feb 2019
Research article |  | 15 Feb 2019

Correcting atmospheric CO2 and CH4 mole fractions obtained with Picarro analyzers for sensitivity of cavity pressure to water vapor

Friedemann Reum, Christoph Gerbig, Jost V. Lavric, Chris W. Rella, and Mathias Göckede

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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 Friedemann Reum on behalf of the Authors (08 Dec 2018)  Author's response    Manuscript
ED: Publish subject to minor revisions (review by editor) (27 Dec 2018) by Dominik Brunner
AR by Friedemann Reum on behalf of the Authors (11 Jan 2019)  Author's response    Manuscript
ED: Publish subject to technical corrections (22 Jan 2019) by Dominik Brunner
AR by Friedemann Reum on behalf of the Authors (26 Jan 2019)  Author's response    Manuscript
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Short summary
Atmospheric CO2 and CH4 mole fractions are often measured using greenhouse gas analyzers manufactured by Picarro, Inc. We report biases in these measurements that are related to pressure changes in the optical cavity of the analyzers and occur mainly at low water vapor mole fractions. We provide a method to correct the biases, which contributes to keeping the overall accuracy of CO2 and CH4 measurements with Picarro analyzers within the WMO interlaboratory compatibility goals.