Articles | Volume 14, issue 4
Atmos. Meas. Tech., 14, 3015–3032, 2021
https://doi.org/10.5194/amt-14-3015-2021
Atmos. Meas. Tech., 14, 3015–3032, 2021
https://doi.org/10.5194/amt-14-3015-2021

Research article 26 Apr 2021

Research article | 26 Apr 2021

Revision of the World Meteorological Organization Global Atmosphere Watch (WMO/GAW) CO2 calibration scale

Bradley D. Hall et al.

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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 Brad Hall on behalf of the Authors (17 Feb 2021)  Author's response    Author's tracked changes    Manuscript
ED: Publish as is (27 Feb 2021) by Thomas Röckmann
AR by Brad Hall on behalf of the Authors (09 Mar 2021)  Author's response    Manuscript
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Short summary
We have recently revised the carbon dioxide calibration scale used by numerous laboratories that measure atmospheric CO2. The revision follows from an improved understanding of the manometric method used to determine the absolute amount of CO2 in an atmospheric air sample. The new scale is 0.18 μmol mol−1 (ppm) greater than the previous scale at 400 ppm CO2. While this difference is small in relative terms (0.045 %), it is significant in terms of atmospheric monitoring.