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

Abstract

Following the recent Global Carbon Project (GCP) synthesis of the decadal methane (CH 4) 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 CH 4 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. The annual global methane emissions from top-down studies, which by construction match the observed methane growth rate within their uncertainties, all show an increase in total methane emissions over the period 2000-2012, but this increase is not linear over the 13 years. Despite differences between individual studies, the mean emission anomaly of the top-down ensemble shows no significant trend in total methane emissions over the period 2000-2006, during the plateau of atmospheric methane mole fractions, and also over the period 2008-2012, during the renewed atmospheric methane increase. However, the top-down ensemble mean produces an emission shift between 2006 and 2008, leading to 22 [16-32]Tg CH 4yr -1 higher methane emissions over the period 2008-2012 compared to 2002-2006. This emission increase mostly originated from themore » tropics, with a smaller contribution from mid-latitudes and no significant change from boreal regions. The regional contributions remain uncertain in top-down studies. Tropical South America and South and East Asia seem to contribute the most to the emission increase in the tropics. However, these two regions have only limited atmospheric measurements and remain therefore poorly constrained. The sectorial partitioning of this emission increase between the periods 2002-2006 and 2008-2012 differs from one atmospheric inversion study to another. However, all top-down studies suggest smaller changes in fossil fuel emissions (from oil, gas, and coal industries) compared to the mean of the bottom-up inventories included in this study. This difference is partly driven by a smaller emission change in China from the top-down studies compared to the estimate in the Emission Database for Global Atmospheric Research (EDGARv4.2) inventory, which should be revised to smaller values in a near future. We apply isotopic signatures to the emission changes estimated for individual studies based on five emission sectors and find that for six individual top-down studies (out of eight) the average isotopic signature of the emission changes is not consistent with the observed change in atmospheric 13CH 4. However, the partitioning in emission change derived from the ensemble mean is consistent with this isotopic constraint. At the global scale, the top-down ensemble mean suggests that the dominant contribution to the resumed atmospheric CH 4 growth after 2006 comes from microbial sources (more from agriculture and waste sectors than from natural wetlands), with an uncertain but smaller contribution from fossil CH 4 emissions. In addition, a decrease in biomass burning emissions (in agreement with the biomass burning emission databases) makes the balance of sources consistent with atmospheric 13CH 4 observations. In most of the top-down studies included here, OH concentrations are considered constant over the years (seasonal variations but without any inter-annual variability). As a result, the methane loss (in particular through OH oxidation) varies mainly through the change in methane concentrations and not its oxidants. For these reasons, changes in the methane loss could not be properly investigated in this study, although it may play a significant role in the recent atmospheric methane changes as briefly discussed at the end of the paper.« less

Authors:
 [1];  [1];  [2];  [1];  [1]; ORCiD logo [3];  [4];  [5]; ORCiD logo [6];  [7];  [8];  [9];  [10];  [11];  [8];  [12];  [13]; ORCiD logo [8];  [14];  [15] more »;  [4];  [16]; ORCiD logo [17];  [18]; ORCiD logo [19];  [20]; ORCiD logo [21]; ORCiD logo [22]; ORCiD logo [23]; ORCiD logo [24];  [23]; ORCiD logo [25]; ORCiD logo [26]; ORCiD logo [27];  [28];  [1];  [23]; ORCiD logo [23];  [29]; ORCiD logo [23];  [30]; ORCiD logo [31]; ORCiD logo [32]; ORCiD logo [33];  [34];  [35]; ORCiD logo [36]; ORCiD logo [1];  [37];  [1];  [38];  [23];  [10];  [39];  [14];  [24];  [40]; ORCiD logo [17]; ORCiD logo [41];  [23]; ORCiD logo [1];  [42];  [43];  [13];  [44];  [45];  [46]; ORCiD logo [47]; ORCiD logo [23];  [41];  [48];  [49] « less
  1. Univ. Paris-Saclay, Gif-sur-Yvette (France). Lab. des Sciences du Climat et de l'Environnement, LSCE-IPSL (CEA-CNRS-UVSQ)
  2. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States). Biospheric Sciences Lab.
  3. Commonwealth Scientific and Industrial Research Organization (CSIRO), Canberra, ACT (Australia). CSIRO Oceans and Atmosphere, Global Carbon Project
  4. National Oceanic and Atmospheric Administration (NOAA), Boulder, CO (United States). Earth System Research Lab.
  5. Istituto Nazionale di Geofisica e Vulcanologia, Roma (Italy); Babes Bolyai Univ., Cluj-Napoca (Romania)
  6. Linköping Univ., Linköping (Sweden)
  7. Netherlands Inst. for Space Research (SRON), Utrecht (Netherlands); Institute for Marine and Atmospheric Research, Utrecht (Netherlands)
  8. European Commission Joint Research Centre, Ispra, Italy
  9. Food and Agriculture Organization of the United Nations (FAO), Rome (Italy). Statistics Division
  10. Seconda Univ. di Napoli, Caserta (Italy); Far East Federal University (FEFU), Vladivostok, Russky Island (Russia); Euro-Mediterranean Center on Climate Change, Lecce (Italy)
  11. Stanford Univ., CA (United States)
  12. Canadian Centre for Climate Modelling and Analysis, Victoria, BC (Canada)
  13. Univ. of Sheffield (United Kingdom)
  14. Univ. of California, Irvine, CA (United States)
  15. National Inst. of Water and Atmospheric Research, Wellington (New Zealand)
  16. Ecole Polytechnique, Palaiseau (France). Lab. de Météorologie Dynamique, LMD/IPSL
  17. Dept. of Geological Sciences and Bolin Centre for Climate Research, Stockholm (Sweden)
  18. Yale Univ., New Haven, CT (United States)
  19. California Inst. of Technology (CalTech), La Canada Flintridge, CA (United States). Jet Propulsion Lab.
  20. Met Office Hadley Centre, Joint Centre for Hydrometeorological Research, Wallingford (United Kingdom)
  21. International Inst. for Applied Systems Analysis (IIASA), Laxenburg (Austria)
  22. Center for Global Environmental Research, National Inst. for Environmental Studies (NIES), Tsukuba (Japan)
  23. National Inst. for Environmental Studies (NIES), Tsukuba (Japan)
  24. Univ. of Bern, Bern (Switzerland)
  25. Max Planck Inst. for Meteorology, Hamburg (Germany)
  26. Commonwealth Scientific and Industrial Research Organization (CSIRO), Aspendale, VIC (Australia). Oceans and Atmosphere
  27. NCAR, Boulder, CO (United States)
  28. Commonwealth Scientific and Industrial Research Organization (CSIRO), Aspendale, VIC (Australia). Oceans and Atmosphere
  29. Environment and Climate Change Canada, Victoria, BC (Canada). Climate Research Division
  30. National Oceanic and Atmospheric Administration (NOAA), Princeton, NJ (United States)
  31. Univ. of Bristol, Clifton, Bristol (United Kingdom)
  32. Arctic Univ. of Norway, Tromsø (Norway)
  33. Dept. of Environmental Geochemical Cycle Research and Inst. of Arctic Climate and Environment Research, JAMSTEC, Yokohama (Japan)
  34. Univ. of Quebec (Canada); Northwest A&F Univ., Yangling (China)
  35. Univ. Paris-Saclay, Gif-sur-Yvette (France). Lab. des Sciences du Climat et de l'Environnement, LSCE-IPSL (CEA-CNRS-UVSQ); Peking Univ., Beijing (China)
  36. CICERO Center for International Climate Research, Oslo, (Norway)
  37. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  38. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  39. Univ. of New Hampshire, Durham, NH (United States)
  40. Japan Meteorological Agency (JMA), Tokyo (Japan)
  41. Auburn Univ., AL (United States)
  42. Imperial College, London (United Kingdom)
  43. Univ. of California, San Diego, CA (United States). Scripps Inst. of Oceanography (SIO)
  44. Met Office Hadley Centre, Exeter (United Kingdom)
  45. Environment Canada,Toronto (Canada)
  46. Univ. of Toronto, ON (Canada)
  47. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Chinese Academy of Sciences (CAS), Beijing (China)
  48. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Swiss Federal Research Institute WSL, Birmensdorf (Switzerland)
  49. Northwest A&F Univ., Yangling, Shaanxi (China). State Key Lab. of Soil Erosion and Dryland Farming on the Loess Plateau
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23)
OSTI Identifier:
1476543
Grant/Contract Number:  
[AC02-05CH11231]
Resource Type:
Accepted Manuscript
Journal Name:
Atmospheric Chemistry and Physics (Online)
Additional Journal Information:
[Journal Name: Atmospheric Chemistry and Physics (Online); Journal Volume: 17; Journal Issue: 18]; Journal ID: ISSN 1680-7324
Publisher:
European Geosciences Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES

Citation Formats

Saunois, Marielle, Bousquet, Philippe, Poulter, Ben, Peregon, Anna, Ciais, Philippe, Canadell, Josep G., Dlugokencky, Edward J., Etiope, Giuseppe, Bastviken, David, Houweling, Sander, Janssens-Maenhout, Greet, Tubiello, Francesco N., Castaldi, Simona, Jackson, Robert B., Alexe, Mihai, Arora, Vivek K., Beerling, David J., Bergamaschi, Peter, Blake, Donald R., Brailsford, Gordon, Bruhwiler, Lori, Crevoisier, Cyril, Crill, Patrick, Covey, Kristofer, Frankenberg, Christian, Gedney, Nicola, Höglund-Isaksson, Lena, Ishizawa, Misa, Ito, Akihiko, Joos, Fortunat, Kim, Heon-Sook, Kleinen, Thomas, Krummel, Paul, Lamarque, Jean-François, Langenfelds, Ray, Locatelli, Robin, Machida, Toshinobu, Maksyutov, Shamil, Melton, Joe R., Morino, Isamu, Naik, Vaishali, O'Doherty, Simon, Parmentier, Frans-Jan W., Patra, Prabir K., Peng, Changhui, Peng, Shushi, Peters, Glen P., Pison, Isabelle, Prinn, Ronald, Ramonet, Michel, Riley, William J., Saito, Makoto, Santini, Monia, Schroeder, Ronny, Simpson, Isobel J., Spahni, Renato, Takizawa, Atsushi, Thornton, Brett F., Tian, Hanqin, Tohjima, Yasunori, Viovy, Nicolas, Voulgarakis, Apostolos, Weiss, Ray, Wilton, David J., Wiltshire, Andy, Worthy, Doug, Wunch, Debra, Xu, Xiyan, Yoshida, Yukio, Zhang, Bowen, Zhang, Zhen, and Zhu, Qiuan. Variability and quasi-decadal changes in the methane budget over the period 2000–2012. United States: N. p., 2017. Web. doi:10.5194/acp-17-11135-2017.
Saunois, Marielle, Bousquet, Philippe, Poulter, Ben, Peregon, Anna, Ciais, Philippe, Canadell, Josep G., Dlugokencky, Edward J., Etiope, Giuseppe, Bastviken, David, Houweling, Sander, Janssens-Maenhout, Greet, Tubiello, Francesco N., Castaldi, Simona, Jackson, Robert B., Alexe, Mihai, Arora, Vivek K., Beerling, David J., Bergamaschi, Peter, Blake, Donald R., Brailsford, Gordon, Bruhwiler, Lori, Crevoisier, Cyril, Crill, Patrick, Covey, Kristofer, Frankenberg, Christian, Gedney, Nicola, Höglund-Isaksson, Lena, Ishizawa, Misa, Ito, Akihiko, Joos, Fortunat, Kim, Heon-Sook, Kleinen, Thomas, Krummel, Paul, Lamarque, Jean-François, Langenfelds, Ray, Locatelli, Robin, Machida, Toshinobu, Maksyutov, Shamil, Melton, Joe R., Morino, Isamu, Naik, Vaishali, O'Doherty, Simon, Parmentier, Frans-Jan W., Patra, Prabir K., Peng, Changhui, Peng, Shushi, Peters, Glen P., Pison, Isabelle, Prinn, Ronald, Ramonet, Michel, Riley, William J., Saito, Makoto, Santini, Monia, Schroeder, Ronny, Simpson, Isobel J., Spahni, Renato, Takizawa, Atsushi, Thornton, Brett F., Tian, Hanqin, Tohjima, Yasunori, Viovy, Nicolas, Voulgarakis, Apostolos, Weiss, Ray, Wilton, David J., Wiltshire, Andy, Worthy, Doug, Wunch, Debra, Xu, Xiyan, Yoshida, Yukio, Zhang, Bowen, Zhang, Zhen, & Zhu, Qiuan. Variability and quasi-decadal changes in the methane budget over the period 2000–2012. United States. doi:10.5194/acp-17-11135-2017.
Saunois, Marielle, Bousquet, Philippe, Poulter, Ben, Peregon, Anna, Ciais, Philippe, Canadell, Josep G., Dlugokencky, Edward J., Etiope, Giuseppe, Bastviken, David, Houweling, Sander, Janssens-Maenhout, Greet, Tubiello, Francesco N., Castaldi, Simona, Jackson, Robert B., Alexe, Mihai, Arora, Vivek K., Beerling, David J., Bergamaschi, Peter, Blake, Donald R., Brailsford, Gordon, Bruhwiler, Lori, Crevoisier, Cyril, Crill, Patrick, Covey, Kristofer, Frankenberg, Christian, Gedney, Nicola, Höglund-Isaksson, Lena, Ishizawa, Misa, Ito, Akihiko, Joos, Fortunat, Kim, Heon-Sook, Kleinen, Thomas, Krummel, Paul, Lamarque, Jean-François, Langenfelds, Ray, Locatelli, Robin, Machida, Toshinobu, Maksyutov, Shamil, Melton, Joe R., Morino, Isamu, Naik, Vaishali, O'Doherty, Simon, Parmentier, Frans-Jan W., Patra, Prabir K., Peng, Changhui, Peng, Shushi, Peters, Glen P., Pison, Isabelle, Prinn, Ronald, Ramonet, Michel, Riley, William J., Saito, Makoto, Santini, Monia, Schroeder, Ronny, Simpson, Isobel J., Spahni, Renato, Takizawa, Atsushi, Thornton, Brett F., Tian, Hanqin, Tohjima, Yasunori, Viovy, Nicolas, Voulgarakis, Apostolos, Weiss, Ray, Wilton, David J., Wiltshire, Andy, Worthy, Doug, Wunch, Debra, Xu, Xiyan, Yoshida, Yukio, Zhang, Bowen, Zhang, Zhen, and Zhu, Qiuan. Wed . "Variability and quasi-decadal changes in the methane budget over the period 2000–2012". United States. doi:10.5194/acp-17-11135-2017. https://www.osti.gov/servlets/purl/1476543.
@article{osti_1476543,
title = {Variability and quasi-decadal changes in the methane budget over the period 2000–2012},
author = {Saunois, Marielle and Bousquet, Philippe and Poulter, Ben and Peregon, Anna and Ciais, Philippe and Canadell, Josep G. and Dlugokencky, Edward J. and Etiope, Giuseppe and Bastviken, David and Houweling, Sander and Janssens-Maenhout, Greet and Tubiello, Francesco N. and Castaldi, Simona and Jackson, Robert B. and Alexe, Mihai and Arora, Vivek K. and Beerling, David J. and Bergamaschi, Peter and Blake, Donald R. and Brailsford, Gordon and Bruhwiler, Lori and Crevoisier, Cyril and Crill, Patrick and Covey, Kristofer and Frankenberg, Christian and Gedney, Nicola and Höglund-Isaksson, Lena and Ishizawa, Misa and Ito, Akihiko and Joos, Fortunat and Kim, Heon-Sook and Kleinen, Thomas and Krummel, Paul and Lamarque, Jean-François and Langenfelds, Ray and Locatelli, Robin and Machida, Toshinobu and Maksyutov, Shamil and Melton, Joe R. and Morino, Isamu and Naik, Vaishali and O'Doherty, Simon and Parmentier, Frans-Jan W. and Patra, Prabir K. and Peng, Changhui and Peng, Shushi and Peters, Glen P. and Pison, Isabelle and Prinn, Ronald and Ramonet, Michel and Riley, William J. and Saito, Makoto and Santini, Monia and Schroeder, Ronny and Simpson, Isobel J. and Spahni, Renato and Takizawa, Atsushi and Thornton, Brett F. and Tian, Hanqin and Tohjima, Yasunori and Viovy, Nicolas and Voulgarakis, Apostolos and Weiss, Ray and Wilton, David J. and Wiltshire, Andy and Worthy, Doug and Wunch, Debra and Xu, Xiyan and Yoshida, Yukio and Zhang, Bowen and Zhang, Zhen and Zhu, Qiuan},
abstractNote = {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. The annual global methane emissions from top-down studies, which by construction match the observed methane growth rate within their uncertainties, all show an increase in total methane emissions over the period 2000-2012, but this increase is not linear over the 13 years. Despite differences between individual studies, the mean emission anomaly of the top-down ensemble shows no significant trend in total methane emissions over the period 2000-2006, during the plateau of atmospheric methane mole fractions, and also over the period 2008-2012, during the renewed atmospheric methane increase. However, the top-down ensemble mean produces an emission shift between 2006 and 2008, leading to 22 [16-32]Tg CH4yr-1 higher methane emissions over the period 2008-2012 compared to 2002-2006. This emission increase mostly originated from the tropics, with a smaller contribution from mid-latitudes and no significant change from boreal regions. The regional contributions remain uncertain in top-down studies. Tropical South America and South and East Asia seem to contribute the most to the emission increase in the tropics. However, these two regions have only limited atmospheric measurements and remain therefore poorly constrained. The sectorial partitioning of this emission increase between the periods 2002-2006 and 2008-2012 differs from one atmospheric inversion study to another. However, all top-down studies suggest smaller changes in fossil fuel emissions (from oil, gas, and coal industries) compared to the mean of the bottom-up inventories included in this study. This difference is partly driven by a smaller emission change in China from the top-down studies compared to the estimate in the Emission Database for Global Atmospheric Research (EDGARv4.2) inventory, which should be revised to smaller values in a near future. We apply isotopic signatures to the emission changes estimated for individual studies based on five emission sectors and find that for six individual top-down studies (out of eight) the average isotopic signature of the emission changes is not consistent with the observed change in atmospheric 13CH4. However, the partitioning in emission change derived from the ensemble mean is consistent with this isotopic constraint. At the global scale, the top-down ensemble mean suggests that the dominant contribution to the resumed atmospheric CH4 growth after 2006 comes from microbial sources (more from agriculture and waste sectors than from natural wetlands), with an uncertain but smaller contribution from fossil CH4 emissions. In addition, a decrease in biomass burning emissions (in agreement with the biomass burning emission databases) makes the balance of sources consistent with atmospheric 13CH4 observations. In most of the top-down studies included here, OH concentrations are considered constant over the years (seasonal variations but without any inter-annual variability). As a result, the methane loss (in particular through OH oxidation) varies mainly through the change in methane concentrations and not its oxidants. For these reasons, changes in the methane loss could not be properly investigated in this study, although it may play a significant role in the recent atmospheric methane changes as briefly discussed at the end of the paper.},
doi = {10.5194/acp-17-11135-2017},
journal = {Atmospheric Chemistry and Physics (Online)},
number = [18],
volume = [17],
place = {United States},
year = {2017},
month = {9}
}

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    Works referencing / citing this record:

    The role of environmental driving factors in historical and projected carbon dynamics of wetland ecosystems in Alaska
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    • Ecological Applications, Vol. 28, Issue 6
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