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Progress in Earth and Planetary Science
Fig. 5 | Progress in Earth and Planetary Science

Fig. 5

From: Near-real-time estimation of fossil fuel CO2 emissions from China based on atmospheric observations on Hateruma and Yonaguni Islands, Japan

Fig. 5

Temporal change in the monthly ΔCO2/ΔCH4 ratios during January–March from 2000 to 2021. The simulated monthly ΔCO2/ΔCH4 ratios based on the FFCO2 emissions of Set A are plotted as purple circles. The observed monthly ΔCO2/ΔCH4 ratios at HAT are plotted as gray circles for comparison. The purple circles surrounded by the dotted line represent the outliers, which are more than 20 mol mol−1 larger than the corresponding observed ratios. The color-coded triangles represent the simulated results based on the FFCO2 emissions of Set B from 55 to 130% for the meteorological fields of 2020 and 2021

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