Articles | Volume 14, issue 4
https://doi.org/10.5194/amt-14-3015-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-14-3015-2021
© Author(s) 2021. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| Highlight paper
| 
26 Apr 2021
Research article | Highlight paper |
| 26 Apr 2021
| 26 Apr 2021
Revision of the World Meteorological Organization Global Atmosphere Watch (WMO/GAW) CO2 calibration scale
Bradley D. Hall
CORRESPONDING AUTHOR
National Oceanic and Atmospheric Administration, Global Monitoring
Laboratory, Boulder, CO, USA
Andrew M. Crotwell
National Oceanic and Atmospheric Administration, Global Monitoring
Laboratory, Boulder, CO, USA
Cooperative Institute for Research in Environmental Sciences,
University of Colorado, Boulder, CO, USA
Duane R. Kitzis
National Oceanic and Atmospheric Administration, Global Monitoring
Laboratory, Boulder, CO, USA
Cooperative Institute for Research in Environmental Sciences,
University of Colorado, Boulder, CO, USA
Thomas Mefford
National Oceanic and Atmospheric Administration, Global Monitoring
Laboratory, Boulder, CO, USA
Cooperative Institute for Research in Environmental Sciences,
University of Colorado, Boulder, CO, USA
Benjamin R. Miller
Cooperative Institute for Research in Environmental Sciences,
University of Colorado, Boulder, CO, USA
retired
Michael F. Schibig
Climate and Environmental Physics, University of Bern, Bern,
Switzerland
Oeschger Centre for Climate Change Research, University of Bern,
Bern, Switzerland
Pieter P. Tans
National Oceanic and Atmospheric Administration, Global Monitoring
Laboratory, Boulder, CO, USA
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Latest update: 23 Nov 2024
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.
We have recently revised the carbon dioxide calibration scale used by numerous laboratories that...
