Atmospheric methane(CH4)concentrations have shown a puzzling resumption in growth since 2007 following a period of stabilization from 2000 to 2006.Multiple hypotheses have been proposed to explain the temporal variations in CH4 growth,and attribute the rise of atmospheric CH4 either to increases in emissions from fossil fuel activities,agriculture and natural wetlands,or to a decrease in the atmospheric chemical sink.Here,we use a comprehensive ensemble of CH4 source estimates and isotopic δ13C-CH4 source signature data to show that the resumption of CH4 growth is most likely due to increased anthropogenic emissions.Our emission scenarios that have the fewest biases with respect to isotopic composition suggest that the agriculture,landfill and waste sectors were responsible for 53±13％of the renewed growth over the period 2007-2017 compared to 2000-2006;industrial fossil fuel sources explained an additional 34±24％,and wetland sources contributed the least at 13±9％.The hypothesis that a large increase in emissions from natural wetlands drove the decrease in atmospheric δ13C-CH4 values cannot be reconciled with current process-based wetland CH4 models.This finding suggests the need for increased wetland measurements to better understand the contemporary and future role of wetlands in the rise of atmospheric methane and climate feedback.Our findings highlight the predominant role of anthropogenic activities in driving the growth of atmospheric CH4 concentrations.

Zhen Zhang;Benjamin Poulter;Sara Knox;Ann Stavert;Gavin McNicol;Etienne Fluet-Chouinard;Aryeh Feinberg;Yuanhong Zhao;Philippe Bousquet;Josep G.Canadell;Anita Ganesan;Gustaf Hugelius;George Hurtt;Robert B.Jackson;Prabir K.Patra;Marielle Saunois;Lena H?glund-lsaksson;Chunlin Huang;Abhishek Chatterjee;Xin Li

Department of Geographical Sciences,University of Maryland,College Park,MD 20742,USA;Biospheric Sciences Laboratory,NASA Goddard Space Flight Center,Greenbelt,MD 20771,USA;Department of Geography,University of British Columbia,Vancouver V6T 1Z2,Canada;Global Carbon Project,CSIRO Oceans and Atmosphere,Canberra,ACT 2601,Australia;Department of Earth and Environmental Sciences,University of Illinois Chicago,Chicago,IL 60607,USA;Department of Earth System Science,Stanford University,Stanford,CA 94305,USA;Institute for Data,Systems and Society,Massachusetts Institute of Technology,Cambridge,MA 02139,USA;College of Oceanic and Atmospheric Sciences,Ocean University of China,Qingdao 266000,China;Laboratoire des Sciences du Climat et de I'Environment,LSCE-IPSL(CEA-CNRS-UVSQ),Université Paris-Saclay,Gif-sur-Yvette 91191,France;School of Geographical Sciences,University of Bristol,Bristol BS8 1RL,UK;Department of Physical Geography and Bolin Centre for Climate Research,Stockholm University,Stockholm SE-10691,Sweden;Woods Institute for the Environment and Precourt Institute for Energy,Stanford University,Stanford,CA 94305,USA;Research Institute for Global Change,JAMSTEC,Yokohama 236-0001,Japan;International Institute for Applied Systems Analysis(IIASA),Laxenburg A-2361,Austria;Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;Global Modeling and Assimilation Office,NASA Goddard Space Flight Center,Greenbelt,MD 20771,USA;Universities Space Research Association,Columbia,MD 21046,USA;Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China

国家科学评论（英文版）

[1]Zhen Zhang;Benjamin Poulter;Sara Knox;Ann Stavert;Gavin McNicol;Etienne Fluet-Chouinard;Aryeh Feinberg;Yuanhong Zhao;Philippe Bousquet;Josep G.Canadell;Anita Ganesan;Gustaf Hugelius;George Hurtt;Robert B.Jackson;Prabir K.Patra;Marielle Saunois;Lena H?glund-lsaksson;Chunlin Huang;Abhishek Chatterjee;Xin Li-.Anthropogenic emission is the main contributor to the rise of atmospheric methane during 1993-2017)[J].国家科学评论（英文版）,2022(05):149-161

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