Li Jiaying, Zhang Xiaoye, Guo Lifeng, Zhong Junting, Wang Deying, Wu Chongyuan, Li Fugang, Li Ming
Monitoring and Assessment Center for GHGs and Carbon Neutrality, State Key Laboratory of Severe Weather of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Monitoring and Assessment Center for GHGs and Carbon Neutrality, State Key Laboratory of Severe Weather of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, China; Joint Laboratory of Climate Change Mitigation and Carbon Neutrality of Henan Univ. & CAMS, Henan 475001, China.
Sci Total Environ. 2024 Jun 15;929:172320. doi: 10.1016/j.scitotenv.2024.172320. Epub 2024 Apr 16.
With China's commitment to reach carbon peak by 2030 and achieve carbon neutrality by 2060, it is particularly important to obtain terrestrial ecosystem carbon fluxes with low uncertainty both globally and in China. The use of more observation data may help reduce the uncertainty of inverting carbon fluxes. This study uses the observation data from global stations, background stations and provincial stations in China, as well as the OCO-2 satellite, and uses the China Carbon Monitoring, Verification and Supporting System for Global (CCMVS-G) to estimate the carbon fluxes of global and Chinese terrestrial ecosystems from 2019 to 2021. The results revealed that the global terrestrial ecosystem carbon sink was approximately -3.40 Pg C/yr from 2019 to 2021. The carbon sinks in the Northern Hemisphere are large, especially in Asia, North America, and Europe. From 2019 to 2021, the carbon sink of China's terrestrial ecosystem was approximately -0.44 Pg C/yr. Carbon sinks exhibit significant seasonal and interannual variations in China. After assimilating the observation data, the uncertainty of the posterior flux is smaller than that of the prior flux, a more reasonable distribution of carbon sources and sinks can be obtained, and more accurate boundary conditions can be provided for the China Carbon Monitoring, Verification and Supporting System for Regional (CCMVS-R). In the future, it is important to establish a well-designed CO ground-based observation network.
随着中国承诺在2030年前实现碳达峰并在2060年前实现碳中和，在全球和中国获取低不确定性的陆地生态系统碳通量尤为重要。使用更多的观测数据可能有助于降低碳通量反演的不确定性。本研究利用中国全球站、背景站和省级站以及OCO-2卫星的观测数据，并使用全球中国碳监测、核查与支持系统（CCMVS-G）来估算2019年至2021年全球和中国陆地生态系统的碳通量。结果表明，2019年至2021年全球陆地生态系统碳汇约为-3.40 Pg C/yr。北半球的碳汇很大，尤其是在亚洲、北美和欧洲。2019年至2021年，中国陆地生态系统的碳汇约为-0.44 Pg C/yr。中国的碳汇表现出显著的季节和年际变化。同化观测数据后，后验通量的不确定性小于先验通量，可以获得更合理的碳源和碳汇分布，并为区域中国碳监测、核查与支持系统（CCMVS-R）提供更准确的边界条件。未来，建立精心设计的一氧化碳地面观测网络很重要。
