IPCC AR6相关甲烷研究进展分析及其对中国的启示OA北大核心CSTPCD

Since industrialization,methane(CH4)has caused a global mean surface temperature rise of about 0.5℃,and a reduction in CH4 emissions is critical to achieving the Paris Agreement's long-term temperature goal.According to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change(IPCC),the relative contribution of CH4 to total effective radiative forcing(ERF)was 11%from 1960 to 2019,compared with the decrease in the relative contribution of CH4 to total ERF from 1750 to 2019.It was related to the change in the growth rate of CH4 concentration in the atmosphere since the 1970s.Projections show that global CH4 emissions are expected to be reduced by up to 45%by 2050,which will benefit reducing peak warming levels and global surface ozone concentration and helping to improve air quality.The report also points out that there is still a large uncertainty in the source and sink of CH4,and it is still challenging to accurately quantify the CH4 flux and attribute its changes.With the release of the Methane Emission Control Action Plan in China,the academic community needs to strengthen the research on CH4 source and sink estimations and make progress in the inversion algorithm for satellite monitoring of atmospheric CH4 concentration,to provide data support for CH4-related mitigation policies in China.