Articles | Volume 17, issue 17
https://doi.org/10.5194/amt-17-5187-2024
https://doi.org/10.5194/amt-17-5187-2024
Research article
 | 
06 Sep 2024
Research article |  | 06 Sep 2024

A high-accuracy dynamic dilution method for generating reference gas mixtures of carbonyl sulfide at sub-nanomole-per-mole levels for long-term atmospheric observation

Hideki Nara, Takuya Saito, Taku Umezawa, and Yasunori Tohjima

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Cited articles

Aoki, N., Ishidoya, S., Murayama, S., and Matsumoto, N.: Influence of CO2 adsorption on cylinders and fractionation of CO2 and air during the preparation of a standard mixture, Atmos. Meas. Tech., 15, 5969–5983, https://doi.org/10.5194/amt-15-5969-2022, 2022. 
Asaf, D., Rotenberg, E., Tatarinov, F., Dicken, U., Montzka, S. A., and Yakir, D.: Ecosystem photosynthesis inferred from measurements of carbonyl sulphide flux, Nat. Geosci., 6, 186–190, https://doi.org/10.1038/NGEO1730, 2013. 
Blonquist Jr., J. M., Montzka, S. A., Munger, J. W., Yakir, D., Desai, A. R., Dragoni, D., Griffis, T. J., Monson, R. K., Scott, R. L., and Bowling, D. R.: The potential of carbonyl sulfide as a proxy for gross primary production at flux tower sites, J. Geophys. Res., 116, G04019, https://doi.org/10.1029/2011JG001723, 2011. 
Brewer, P. J., Goody, B. A., Woods, P. T., and Milton, M. J. T.: A dynamic gravimetric standard for trace water, Rev. Sci. Inst., 82, 105102, https://doi.org/10.1063/1.3642660, 2011. 
Brewer, P. J., Miñarro, M. D., Di Meane, E. A., and Brown, R. J. C.: A high accuracy dilution system for generating low concentration reference standards of reactive gases, Measurement, 47, 607–612, https://doi.org/10.1016/j.measurement.2013.09.045, 2014. 
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Short summary
We have developed a high-accuracy dynamic dilution system for generating reference gas mixtures containing carbonyl sulfide (COS). Although COS at ambient levels generally has poor storage stability, our approach involves the dilution of a gas mixture containing micromole-per-mole levels of COS, the stability of which was validated for more than 1 decade. The developed system has excellent dilution performance and will facilitate accurate instrumental calibration for atmospheric COS observation.
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