Contribution of anthropogenic and natural sources to atmospheric methane variability

P. Bousquet (), P. Ciais, J. B. Miller, E. J. Dlugokencky, D. A. Hauglustaine, C. Prigent, G. R. Van der Werf, P. Peylin, E.-G. Brunke, C. Carouge, R. L. Langenfelds, J. Lathière, F. Papa, M. Ramonet, M. Schmidt, L. P. Steele, S. C. Tyler and J. White
Additional contact information
P. Bousquet: Laboratoire des Sciences du Climat et de l'Environnement, IPSL-LSCE, CEA-CNRS-UVSQ
P. Ciais: Laboratoire des Sciences du Climat et de l'Environnement, IPSL-LSCE, CEA-CNRS-UVSQ
J. B. Miller: Global Monitoring Division
E. J. Dlugokencky: Global Monitoring Division
D. A. Hauglustaine: Laboratoire des Sciences du Climat et de l'Environnement, IPSL-LSCE, CEA-CNRS-UVSQ
C. Prigent: LERMA, Observatoire de Paris
G. R. Van der Werf: Vrije Universiteit
P. Peylin: Laboratoire de Biogéochimie Isotopique, LBI
E.-G. Brunke: South African Weather Service
C. Carouge: Laboratoire des Sciences du Climat et de l'Environnement, IPSL-LSCE, CEA-CNRS-UVSQ
R. L. Langenfelds: CSIRO, Marine and Atmospheric Research
J. Lathière: Laboratoire des Sciences du Climat et de l'Environnement, IPSL-LSCE, CEA-CNRS-UVSQ
F. Papa: LERMA, Observatoire de Paris
M. Ramonet: Laboratoire des Sciences du Climat et de l'Environnement, IPSL-LSCE, CEA-CNRS-UVSQ
M. Schmidt: Laboratoire des Sciences du Climat et de l'Environnement, IPSL-LSCE, CEA-CNRS-UVSQ
L. P. Steele: CSIRO, Marine and Atmospheric Research
S. C. Tyler: University of California
J. White: University of Colorado

Nature, 2006, vol. 443, issue 7110, 439-443

Abstract: Methane: masked intruder Changes in atmospheric methane levels over the past twenty years are well documented, but the causes of these changes remain uncertain. Bousquet et al. use inverse (top-down) modelling to quantify variations in methane emissions from different sources between 1983 and 2004. They find that a decrease in the growth rate of atmospheric methane during the 1990s was caused by a decrease in anthropogenic emissions, but that anthropogenic emissions have increased again since 1999. To date, this trend has been masked by a coincident decrease in wetland emissions, but it is possible that it will cause total methane levels to rise again in the near future.

Date: 2006
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DOI: 10.1038/nature05132

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