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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-273
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 03 Sep 2018

Research article | 03 Sep 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Gravimetrically-Prepared Carbon Dioxide Standards in Support of Atmospheric Research

Bradley D. Hall1, Andrew M. Crotwell1,2, Benjamin R. Miller1,2, Michael Schibig3, and James W. Elkins1 Bradley D. Hall et al.
  • 1National Oceanic and Atmospheric Administration, Global Monitoring Division, 325 Broadway, Boulder, Colorado 80305, USA
  • 2University of Colorado, Cooperative Institute for Research in Environmental Science, Boulder, Colorado 80309, USA
  • 3Climate and Environmental Physics, Physics Institute and Oeschger Centre for Climate Change Research, University of Bern, Switzerland

Abstract. We have explored a one-step method for gravimetric preparation of CO2-in-air standards in aluminum cylinders. We consider both adsorption to stainless steel surfaces used in the transfer of highly-pure CO2, and adsorption of CO2 to cylinder walls. We demonstrate that CO2-in-air standards can be prepared with relatively low uncertainty (~0.04%, ~95% Confidence Level) by introducing aliquots whose masses are know to high precision, and by using well-characterized cylinders. Five gravimetric standards, prepared over the nominal range 350 to 490┬Ámolmol−1 (parts per million, ppm), showed excellent internal consistency, with residuals from a linear fit equal to 0.05ppm. This work compliments efforts to maintain the World Meteorological Organization, Global Atmosphere Watch, mole fraction scale for carbon dioxide, widely used for atmospheric monitoring. This gravimetric technique could be extended to other atmospheric trace gases, depending on the vapor pressure of the gas.

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Short summary
We have used a one-step method to prepare gravimetric of CO2-in-air standards in aluminum cylinders. We consider both adsorption to stainless steel surfaces used in the transfer of highly-pure CO2, and adsorption of CO2 to cylinder walls. This work compliments on-going efforts to support atmospheric monitoring of CO2.
We have used a one-step method to prepare gravimetric of CO2-in-air standards in aluminum...
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