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. A study was conducted to compare the δ(O2/N2)scales used by four laboratories engaged in atmospheric δ(O2/N2) measurements. These laboratories are the ResearchInstitute for Environmental Management Technology, Advanced IndustrialScience and Technology (EMRI/AIST); the National Institute for EnvironmentalStudies (NIES); Tohoku University (TU); and Scripps Institution ofOceanography (SIO). Therefore, five high-precision standard mixtures for theO2 molar fraction gravimetrically prepared by the National MetrologyInstitute of Japan, AIST (NMIJ/AIST) with a standard uncertainty ofless than 5 per meg (0.001 ‰) were used as round-robin standard mixtures. EMRI/AIST,NIES, TU, and SIO reported the analyzed values of the standard mixtures ontheir own δ(O2/N2) scales, and the values were comparedwith the δ(O2/N2) values gravimetrically determined byNMIJ/AIST (the NMIJ/AIST scale). The δ(O2/N2) temporaldrift in the five standard mixtures during the intercomparison experimentfrom May 2017 to March 2020 was corrected based on the δ(O2/N2) values analyzed before and after the laboratorymeasurements by EMRI/AIST. The scales are compared based on offsets in zeroand span. The relative span offsets of EMRI/AIST, TU, NIES, and SIO scalesagainst the NMIJ/AIST scale were -0.11%±0.10%, -0.10%±0.13%,3.39 %±0.13 %, and 0.93 %±0.10 %, respectively. The largestoffset corresponded to a 0.30 Pg yr−1 decrease and increase in globalestimates for land biospheric and oceanic CO2 uptakes based on trendsin atmospheric CO2 and δ(O2/N2). The deviations inthe measured δ(O2/N2) values on the laboratory scales fromthe NMIJ/AIST scale are 65.8±2.2, 425.7±3.1, 404.5±3.0, and 596.4±2.4 per meg for EMRI/AIST, TU, NIES, and SIO,respectively. The difference between atmospheric δ(O2/N2)values observed at Hateruma Island (HAT; 24.05∘ N,123.81∘ E), Japan, by EMRI/AIST and NIES were reduced from -329.3±6.9 to -6.6±6.8 per meg by converting their scalesto the NMIJ/AIST scale.

atmospheric measurement techniques

Intercomparison of O&lt;sub&gt;2&lt;/sub&gt; ∕ N&lt;sub&gt;2&lt;/sub&gt; ratio scales among AIST, NIES, TU, and SIO based on a round-robin exercise using gravimetric standard mixtures