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- W4243787794 abstract "Abstract. Atmospheric oxygen (O2) and carbon dioxide (CO2) mixing ratios in the North Pacific were observed onboard a cargo ship, the New Century 2 (NC2), while it cruised between Japan and the United States between December 2015 and November 2016. A fuel cell analyzer and a non-dispersive infrared analyzer were used for measurement of O2 and CO2, respectively. To achieve parts-per-million precision for the O2 measurements, we precisely controlled the flow rates of the sample and reference air introduced into the analyzers and the outlet pressure. A relatively low airflow rate (10 cm3 min−1) was adopted to reduce the consumption rate of the reference gases. In the laboratory, the system achieved measurement precisions of 3.8 per meg for the O2 / N2 ratio, which is commonly used to express atmospheric O2 variation, and 0.1 ppm for the CO2 mixing ratio. After the in situ observation started onboard NC2, we found that the ship's motion caused false wavy variations of the O2 signal with an amplitude of more than several tens of ppm and a period of about 20 s. Although we have not resolved the problem at this stage, hourly averaging considerably suppressed the variation associated with ship motion. Comparison between the in situ observation and flask sampling of air samples onboard NC2 showed that the averaged differences (in situ – flask) and the standard deviations (±1σ) are −2.1 ± 9.2 per meg for the O2 / N2 ratio and −0.02 ± 0.33 ppm for the CO2 mixing ratio. We compared the 1 yr of in situ data for atmospheric potential oxygen (APO) (= O2 + 1.1 × CO2) obtained from the broad middle-latitudes region (140° E–130° W, 29° N–45° N) with previous flask sampling data from the North Pacific. This comparison showed that longitudinal differences in the seasonal amplitude of APO, ranging from 51 to 73 per meg, were smaller than the latitudinal differences." @default.
- W4243787794 created "2022-05-12" @default.
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- W4243787794 date "2018-02-22" @default.
- W4243787794 modified "2023-09-24" @default.
- W4243787794 title "In situ observation of atmospheric oxygen and carbon dioxide in the North Pacific using a cargo ship" @default.
- W4243787794 doi "https://doi.org/10.5194/acp-2018-195" @default.
- W4243787794 hasPublicationYear "2018" @default.
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