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Atmosphere 2018, 9(10), 367; https://doi.org/10.3390/atmos9100367

Diurnal and Seasonal Variations of Carbon Dioxide (CO2) Concentration in Urban, Suburban, and Rural Areas around Tokyo

Atmosphere and Ocean Research Institute, The University of Tokyo, Kashiwa-shi, Chiba 277-8568, Japan
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Received: 20 April 2018 / Revised: 17 August 2018 / Accepted: 5 September 2018 / Published: 20 September 2018
(This article belongs to the Special Issue Greenhouse Gases: Measurements and Analysis)
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Abstract

Site environments and instrumental characteristics of carbon dioxide (CO2) measurements operated by local governments in the Kanto Plain, the center of which is Tokyo, were summarized for this study. The observation sites were classified into environments of three types: urban, suburban, and woodland. Based on a few decades of accumulated hourly data, the diurnal and seasonal variations of CO2 concentrations were analyzed as a composite of anomalies from annual means recorded for each site. In urban areas, the highest concentrations appear before midnight in winter. The second peak corresponds to the morning rush hour and the strengthening of the inversion layer. Suburban areas can be characterized as having the highest concentration before dawn and the lowest concentration during the daytime in summer in association with the activation of respiration and photosynthesis of vegetation. In these areas, concentration peaks also appear during the morning rush hour. Woodland areas show background features, with the highest concentration in early spring, which are higher than the global background by about 5 ppmv. View Full-Text
Keywords: CO2; carbon dioxide; mega-city; diurnal cycle; CO2 emission; greenhouse gases observing satellite (GOSAT) CO2; carbon dioxide; mega-city; diurnal cycle; CO2 emission; greenhouse gases observing satellite (GOSAT)
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Imasu, R.; Tanabe, Y. Diurnal and Seasonal Variations of Carbon Dioxide (CO2) Concentration in Urban, Suburban, and Rural Areas around Tokyo. Atmosphere 2018, 9, 367.

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