Tokyo's annual CO₂-emissions can be calculated from 4 years of data from the TCCON station in Tsukuba and radiosondes

The yearly CO₂ emissions of Tokyo can be estimated using only 4 years of Total Carbon Column Observing Network (TCCON) data and radiosonde data. Positive differences of measured CO₂-concentrations and typical seasonal background concentrations are shown as a function of wind speed and direction. The sector of 170 to 240 degrees is associated with the Tokyo plume where elevated concentrations are found. These data were used to calculate Tokyo's annual CO₂-emissions. © A. Babenhauserheide, F. Hase und Isamu Morino, 2020, Creative Commons Attribution 4.0 License.

The CO₂ concentrations in terms of XCO2  were measured with a near-infrared spectrometer at Tsukuba, north-east of Tokyo, where a station of the Total Carbon Column Observing Network (TCCON) is situated. A parametric model was used to fit the trend and annual cycle to measurements representing background air. The positive differences between the XCO2 measured in the Tokyo sector of wind directions and the modelled background at the same time represent Tokyo's CO₂ emissions.

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