Preprint Article Version 1 This version is not peer-reviewed

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

Version 1 : Received: 20 April 2018 / Approved: 20 April 2018 / Online: 20 April 2018 (11:35:55 CEST)

How to cite: Imasu, R.; Tanabe, Y. Diurnal and Seasonal Variations of Carbon Dioxide (CO2) Concentration in Urban, Suburban and Rural Areas around Tokyo-City. Preprints 2018, 2018040265 (doi: 10.20944/preprints201804.0265.v1). Imasu, R.; Tanabe, Y. Diurnal and Seasonal Variations of Carbon Dioxide (CO2) Concentration in Urban, Suburban and Rural Areas around Tokyo-City. Preprints 2018, 2018040265 (doi: 10.20944/preprints201804.0265.v1).

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 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: higher than the global background by about 5 ppmv.

Subject Areas

CO2; Carbon dioxide; mega-city; diurnal cycle; CO2 emission; GOSAT

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