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YAO Lu, YANG Dongxu, CAI Zhaonan, et al. 2022. Status and Trend Analysis of Atmospheric Methane Satellite Measurement for Carbon Neutrality and Carbon Peaking in China [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 46(6): 1469−1483. doi: 10.3878/j.issn.1006-9895.2207.22096
Citation: YAO Lu, YANG Dongxu, CAI Zhaonan, et al. 2022. Status and Trend Analysis of Atmospheric Methane Satellite Measurement for Carbon Neutrality and Carbon Peaking in China [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 46(6): 1469−1483. doi: 10.3878/j.issn.1006-9895.2207.22096

Status and Trend Analysis of Atmospheric Methane Satellite Measurement for Carbon Neutrality and Carbon Peaking in China

  • Methane (CH4) is an important greenhouse gas, and its radiative forcing is second only to that of carbon dioxide (CO2). Reducing CH4 emissions is necessary to control global warming and achieve carbon neutrality. To achieve carbon neutrality by 2060, quickly locating emission sources and accurately estimating the distribution of global and regional CH4 sources and sinks are of great practical importance for formulating, implementing, and evaluating mitigation measures. In addition, combining long-term CH4 observation data and climate system models to explore the changing trend in atmospheric CH4 concentration is a premise for predicting and actively responding to climate change. The 49th session of the Intergovernmental Panel on Climate Change (IPCC 49) proposed a “top-down” approach to calculating fluxes to verify emission inventories. This method is mainly based on atmospheric measurements, indicating the importance of obtaining high-precision, global-scale CH4 observation data with high spatial and temporal resolution. To achieve carbon neutrality, we start with several key scientific issues that must be solved in atmospheric CH4 research to analyze the requirements of CH4 satellite measurement. In this paper, we also summarize the status and development trend of CH4 satellite measurement and briefly introduce the implementation of China’s next-generation carbon satellite. Space-based CH4 measurement relies on high-precision retrieval algorithms to provide reliable data products for monitoring and further applications. On the basis of the status of the CH4 satellite remote sensing retrieval algorithm and the application of corresponding data products in emission monitoring and flux estimation, we further discuss the necessity of improving calculation efficiency and accuracy for the remote sensing retrieval algorithm and flux inversion algorithm. As for monitoring and controlling the anthropogenic emission process, developing a rapid identification algorithm for methane plumes and an emission evaluation method should also be considered. Finally, this paper summarizes the detection, data acquisition, and application of satellite-based CH4 measurements and indicates the scientific application potential of CH4 satellite observations for carbon neutrality goals.
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