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Figure 3 | Scientific Reports

Figure 3

From: Statistical characterization of urban CO₂ emission signals observed by commercial airliner measurements

Variability of CO₂ enhancements over cities worldwide. (a–c), Maps of the SD values at 1.0–1.5 km altitudes. Size and color of the circles indicate magnitude of the SD (see the legend in panel c). (d) Relationship of the SD at 1.0–1.5 km (red) and 4.0–4.5 km (light blue) altitude bins with city CO₂ emissions based on the ODIAC dataset^{×ばつ1 km) global fossil fuel CO2 emission inventory derived using a point source database and satellite observations of nighttime lights. Atmos. Chem. Phys. 11, 543–556,
https://doi.org/10.5194/acp-11-543-2011

(2011)." href="/index.cgi/larger-text/https://www.nature.com/articles/s41598-020-64769-9#ref-CR26" id="ref-link-section-d91311833e816">26,27}. Solid lines are least square fits to the data at respective altitude bins. Airport codes are indicated for the data from 1.0–1.5 km. The error bars represent range of the SD calculated by a Bootstrap method (N = 1000).

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