Abstract
China's anthropogenic CH4 emissions have been increasing before 2010, while no clear trends have been reported by previous studies regarding China's CH4 emissions post-2010. After analyzing the column-averaged dry-air concentration data of CH4 from a Scanning Imaging Absorption Spectrometer for Atmospheric Cartography (SCIAMACHY) and Greenhouse Gases Observing Satellite (GOSAT), this study found that the average concentration of CH4 in China increased from 1780 ppb in 2003 to 1873 ppb in 2020. The average growth rate of China's CH4 concentration was 2.8 ± 1.7 ppb/yr (parts per billion per year) during 2003–2009, and 8.5 ± 0.7 ppb/yr during 2010–2020, which is similar to the global concentration growth. The enhancement of the CH4 concentration in China relative to background concentrations increased by 0.94 ± 0.20 ppb/yr (4.4 ± 0.95%) during 2003–2009 and 0.09 ± 0.07 ppb/yr (0.49 ± 0.41%) during 2010–2020. This study implies that China's CH4 emissions increased rapidly during 2003–2009 but increased very slightly during 2010–2020.
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