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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers | Copyright
https://doi.org/10.5194/amt-2018-192
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 26 Jun 2018

Research article | 26 Jun 2018

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

Preparation of primary standard mixtures for atmospheric oxygen measurements with uncertainty less than 1 ppm for oxygen mole fractions

Nobuyuki Aoki1, Shigeyuki Ishidoya2, Nobuhiro Mastumoto1, Takuro Watanave1, Takuya Shimosaka1, and Shohei Murayama2 Nobuyuki Aoki et al.
  • 1National Meteorology Institute of Japan, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8563, Japan
  • 2National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8569, Japan

Abstract. Primary standard mixtures with less than 1ppm or 5 per meg standard uncertainty for O2 mole fractions or for O2/N2 ratios were prepared to monitor changes, which occurred in atmospheric oxygen. These mixtures were crafted in 10L high-pressure aluminum cylinders using a gravimetric method in which unknown uncertainty factors were identified and subsequently reduced. The mole fractions of the constituents, CO2, Ar, O2, and N2, were mainly determined using the masses of the respective source gases that had been filled into the cylinders. To precisely determine the masses of the source gases used in each case, the differences in the masses of the cylinders before and after filling were calculated and compared to nearly identical reference cylinders. Although the mass of the cylinder with respect to the reference cylinder tended to vary in relation to temperature differences between both cylinders, the degree of change could be reduced by measuring both cylinders at the same temperature. The standard uncertainty for the cylinder mass was determined to be 0.82mg. The standard uncertainties for the O2 mole fractions and O2/N2 ratios in the primary standard mixtures ranged from 0.7ppm to 0.8ppm and from 3.3 per meg to 4.0 per meg, respectively. Based on the primary standard mixtures, the mole fractions of atmospheric O2 and Ar on Hateruma Island, Japan. In 2015, the O2 and Ar mole fractions were found to be 209339.1±1.1ppm and 9334.4±0.7ppm.

Nobuyuki Aoki et al.
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Nobuyuki Aoki et al.
Nobuyuki Aoki et al.
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Observation of atmospheric O2 requires highly precise standard gas mixtures with uncertainty of less than 1 ppm for O2 mole fraction or 5 per meg for O2/N2. The uncertainty had not been achieved due unknown uncertainty factors in mass determination of the filled source gases. We first developed the primary standard mixtures with 1 ppm for O2 mole fraction or 5 per meg by identifying and reducing the unknown uncertainty factors.
Observation of atmospheric O2 requires highly precise standard gas mixtures with uncertainty of...
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