Articles | Volume 20, issue 9
Atmos. Chem. Phys., 20, 5293–5308, 2020
Atmos. Chem. Phys., 20, 5293–5308, 2020
Research article
15 May 2020
Research article | 15 May 2020

O2 : CO2 exchange ratio for net turbulent flux observed in an urban area of Tokyo, Japan, and its application to an evaluation of anthropogenic CO2 emissions

Shigeyuki Ishidoya et al.

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Cited articles

Aoki, N., Ishidoya, S., Matsumoto, N., Watanabe, T., Shimosaka, T., and Murayama, S.: Preparation of primary standard mixtures for atmospheric oxygen measurements with less than 1 µmol mol−1 uncertainty for oxygen molar fractions, Atmos. Meas. Tech., 12, 2631–2646,, 2019. 
Aubinet, M., Vesala, T., and Papale, D. (Eds.): Eddy Covariance: A Practical Guide to Measurement and Data Analysis, Springer, the Netherlands, 2012. 
Blaine, T. W., Keeling, R. F., and Paplawsky, W. J.: An improved inlet for precisely measuring the atmospheric Ar∕N2 ratio, Atmos. Chem. Phys., 6, 1181–1184,, 2006. 
Etsuki, R.: SCADA system of Tokyo Gas for wide-area city gas distribution, in: Proceedings of the 53rd Japan Joint Automatic Control Conference, Kochi, Japan, November 2010, 46, 1099–1102, 2010. 
Goto, D., Morimoto, S., Ishidoya, S., Ogi, A., Aoki, S., and Nakazawa, T.: Development of a high precision continuous measurement system for the atmospheric O2∕N2 ratio and its application at Aobayama, Sendai, Japan, J. Meteorol. Soc. Jpn., 91, 179–192, 2013a. 
Short summary
Atmospheric O2 and CO2 concentrations, along with CO2 flux, have been observed in a megacity, Tokyo, Japan. The O2 : CO2 exchange ratio for net turbulent O2 and CO2 fluxes (ORF) between the urban area and the overlaying atmosphere was obtained, and we applied it to estimate the diurnal cycles of CO2 fluxes from gas and liquid fuel consumption separately. We found simultaneous observations of ORF and CO2 flux are useful in validating CO2 emission inventories from statistical data.
Final-revised paper