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Discussion papers
https://doi.org/10.5194/acp-2019-652
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2019-652
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 05 Sep 2019

Submitted as: research article | 05 Sep 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Consumption of atmospheric O2 in an Urban Area of Tokyo, Japan derived from continuous observations of O2 and CO2 concentrations and CO2 flux

Shigeyuki Ishidoya1, Hirofumi Sugawara2, Yukio Terao3, Naoki Kaneyasu1, Nobuyuki Aoki1, Kazuhiro Tsuboi4, and Hiroaki Kondo1 Shigeyuki Ishidoya et al.
  • 1National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8569, Japan
  • 2Department of Earth and Ocean Sciences, National Defense Academy of Japan, Yokosuka 239-8686, Japan
  • 3National Institute for Environmental Studies, Tsukuba 305-8506, Japan
  • 4Meteorological Research Institute, Tsukuba 305-0052, Japan

Abstract. In order to estimate the atmospheric O2 consumption in a megacity, continuous observations of atmospheric O2 and CO2 concentrations and of CO2 flux have been carried out simultaneously at the Yoyogi (YYG) site in middle of Tokyo, Japan since March 2016. An average O2 : CO2 exchange ratio for net turbulent O2 and CO2 fluxes (ORF) between the urban area and the overlying atmosphere was obtained based on an aerodynamic method using the observed O2 and CO2 concentrations. The yearly mean ORF was found to be 1.62, falling within the range of the average OR values of liquid and gas fuels. Seasonally different diurnal ORF cycles at YYG indicated that the consumption of gas fuels was larger in the winter than that in the summer, especially in the morning and late in the evening. By using the ORF and CO2 flux values, the annual mean O2 consumption rate was estimated to be −16.3 μmol m−2 s−1, which is more than 350 times larger than the global mean atmospheric O2 consumption rate (about −4 μmol yr−1), implying that our life in a megacity is far from sustainable from a viewpoint of the conservation of atmospheric O2.

Shigeyuki Ishidoya et al.
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Shigeyuki Ishidoya et al.
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