Variability and quasi-decadal changes in the methane budget over the period 2000–2012

Creators: Saunois, Marielle; Frankenberg, Christian

Abstract

Following the recent Global Carbon Project (GCP) synthesis of the decadal methane (CH4) budget over 2000–2012 (Saunois et al., 2016), we analyse here the same dataset with a focus on quasi-decadal and inter-annual variability in CH4 emissions. The GCP dataset integrates results from top-down studies (exploiting atmospheric observations within an atmospheric inverse-modelling framework) and bottom-up models (including process-based models for estimating land surface emissions and atmospheric chemistry), inventories of anthropogenic emissions, and data-driven approaches.

Additional Information

© Author(s) 2017. This work is distributed under the Creative Commons Attribution 3.0 License. Received: 30 Mar 2017, Discussion started: 18 Apr 2017 Revised: 18 Jul 2017, Accepted: 20 Jul 2017, Published: 20 Sep 2017. Competing interests. The authors declare that they have no conflictof interest. This collaborative international effort is part of the Global Carbon Project activity to establish and track greenhouse gas budgets and their trends. Marielle Saunois and Philippe Bousquet acknowledge the Global Carbon Project for the scientific advice and the computing support of LSCE–CEA and of the national computing center TGCC. We acknowledge the two anonymous reviewers who helped in improving the manuscript to present the most thorough review of what is know on the recent methane budget Changes. Ben Poulter has been funded by the EU FP7 GEOCARBON project. Josep G. Canadell thanks the National Environmental Science Program – Earth Systems and Climate Change Hub for their support. Donald R. Black and Isobel J. Simpson (UCI) acknowledge funding support from NASA (NNX07AK10G). Fortunat Joos, Renato Spahni, and Ronny Schroeder acknowledge support by the Swiss National Science Foundation. Changhui Peng acknowledges the support of the National Science and Engineering Research Council of Canada (NSERC) discovery grant and China's Qian-Ren Program. Glen P. Peters acknowledges the support of the Research Council of Norway project 209701. David Bastviken acknowledges support from the Swedish Research Council VR and ERC (grant no. 725546). Patrick Crill acknowledges support from the Swedish Research Council VR. Francesco N. Tubiello acknowledges the support of FAO Regular Programme Funding under O6 and SO2 for the development and maintenance of the FAOSTAT emissions database. The FAOSTAT database is supported by regular programme funding from all FAO member countries. Prabir K. Patra is partly supported by the Environment Research and Technology Development Fund (A2-1502) of the Ministry of the Environment, Japan. William J. Riley and Xiyan Xu were supported by the Director, Office of Science, Office of Biological and Environmental Research of the US Department of Energy under Contract DE-AC02-05CH11231 as part of the RGCM BGC–Climate Feedbacks SFA. Peter Bergamaschi and Mihai Alexe acknowledge support by the European Commission Seventh Framework Programme (FP7/2007–2013) project MACCII under grant agreement 283576, by the European Commission Horizon 2020 Programme project MACC-III under grant agreement 633080, and by the ESA Climate Change Initiative Greenhouse Gases Phase 2 project. Hanqin Tian and Bowen Zhang acknowledge support by the NASA Carbon Monitoring Program (NNX12AP84G, NNX14AO73G). Heon-Sook Kim and Shamil Maksyutov acknowledge use of the GOSAT Research Computation Facility. Nicola Gedney and Andy Wiltshire acknowledge support by the Joint DECC/Defra Met Office Hadley Centre Climate Programme (GA01101). David J. Beerling acknowledges support from an ERC Advanced grant (CDREG, 322998) and NERC (NE/J00748X/1). The CSIRO and the Australian Government Bureau of Meteorology are thanked for their ongoing long-term support of the Cape Grim station and the Cape Grim science programme. The CSIRO flask network is supported by CSIRO Australia, the Australian Bureau of Meteorology, the Australian Institute of Marine Science, the Australian Antarctic Division, the NOAA USA, and the Meteorological Service of Canada. The operation of the AGAGE instruments at Mace Head, Trinidad Head, Cape Matatula, Ragged Point, and Cape Grim is supported by the National Aeronautic and Space Administration (NASA; grants NAG5-12669, NNX07AE89G, and NNX11AF17G to MIT and grants NNX07AE87G, NNX07AF09G, NNX11AF15G, and NNX11AF16G to SIO), the Department of Energy and Climate Change (DECC, UK) contract GA01081 to the University of Bristol, the Commonwealth Scientific and Industrial Research Organisation (CSIRO Australia), and the Bureau of Meteorology (Australia). Marielle Saunois and Philippe Bousquet acknowledge Lyla Taylor (University of Sheffield, UK), Chris Jones (Met Office, UK), and Charlie Koven (Lawrence Berkeley National Laboratory, USA) for their participation in land surface modelling of wetland emissions. Theodore J. Bohn (ASU, USA), Jens Greinhert (GEOMAR, the Netherlands), Charles Miller (JPL, USA), and Tonatiuh Guillermo Nunez Ramirez (MPI Jena, Germany) are thanked for their useful comments and suggestions on the manuscript. Marielle Saunois and Philippe Bousquet acknowledge Martin Herold (WU, the Netherlands), Mario Herrero (CSIRO, Australia), Paul Palmer (University of Edinburgh, UK), Matthew Rigby (University of Bristol, UK), Taku Umezawa (NIES, Japan), Ray Wang (GIT, USA), Jim White (INSTAAR, USA), Tatsuya Yokota (NIES, Japan), Ayyoob Sharifi and Yoshiki Yamagata (NIES/GCP, Japan), and Lingxi Zhou (CMA, China) for their interest and discussions on the Global Carbon Project methane. Marielle Saunois and Philippe Bousquet acknowledge the initial contribution to the Global Methane Budget 2016 release and/or possibly future contribution to the next Global Methane Budget of Victor Brovkin (MPI Hamburg, Germany), Charles Curry (University of Victoria, Canada), Kyle C. McDonald (City University of New-York, USA), Julia Marshall (MPI Jena, Germany), Christine Wiedinmyer (NCAR, USA), Michiel van Weele (KNMI, Netherlands), Guido R. van der Werf Amsterdam, Netherlands) and Paul Steele (retired from CSIRO, (Australia). Edited by: Martyn Chipperfield Reviewed by: two anonymous referees

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