Publication Abstracts

Kirschke et al. 2013

Kirschke, S., P. Bousquet, P. Ciais, M. Saunois, J.G. Canadell, E.J. Dlugokencky, P. Bergamaschi, D. Bergmann, D.R. Blake, L. Bruhwiler, P. Cameron-Smith, S. Castaldi, F. Chevallier, L. Feng, A. Fraser, M. Heimann, E.L. Hodson, S. Houweling, B. Josse, P.J. Fraser, P.B. Krummel, J.-F. Lamarque, R.L. Langenfelds, C. Le Quéré, V. Naik, S. O'Doherty, P.I. Palmer, I. Pison, D. Plummer, B. Poulter, R.G. Prinn, M. Rigby, B. Ringeval, M. Santini, M. Schmidt, D.T. Shindell, I.J. Simpson, R. Spahni, L.P. Steele, S.A. Strode, K. Sudo, S. Szopa, G.R. van der Werf, A. Voulgarakis, M. van Weele, R.F. Weiss, J.E. Williams, and G. Zeng, 2013: Three decades of global methane sources and sinks. Nat. Geosci., 6, 813-823, doi:10.1038/ngeo1955.

Methane is an important greenhouse gas, responsible for about 20% of the warming induced by long-lived greenhouse gases since pre-industrial times. By reacting with hydroxyl radicals, methane reduces the oxidizing capacity of the atmosphere and generates ozone in the troposphere. Although most sources and sinks of methane have been identified, their relative contributions to atmospheric methane levels are highly uncertain. As such, the factors responsible for the observed stabilization of atmospheric methane levels in the early 2000s, and the renewed rise after 2006, remain unclear. Here, we construct decadal budgets for methane sources and sinks between 1980 and 2010, using a combination of atmospheric measurements and results from chemical transport models, ecosystem models, climate chemistry models and inventories of anthropogenic emissions. The resultant budgets suggest that data-driven approaches and ecosystem models overestimate total natural emissions. We build three contrasting emission scenarios — which differ in fossil fuel and microbial emissions — to explain the decadal variability in atmospheric methane levels detected, here and in previous studies, since 1985. Although uncertainties in emission trends do not allow definitive conclusions to be drawn, we show that the observed stabilization of methane levels between 1999 and 2006 can potentially be explained by decreasing-to-stable fossil fuel emissions, combined with stable-to-increasing microbial emissions. We show that a rise in natural wetland emissions and fossil fuel emissions probably accounts for the renewed increase in global methane levels after 2006, although the relative contribution of these two sources remains uncertain.

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BibTeX Citation

  author={Kirschke, S. and Bousquet, P. and Ciais, P. and Saunois, M. and Canadell, J. G. and Dlugokencky, E. J. and Bergamaschi, P. and Bergmann, D. and Blake, D. R. and Bruhwiler, L. and Cameron-Smith, P. and Castaldi, S. and Chevallier, F. and Feng, L. and Fraser, A. and Heimann, M. and Hodson, E. L. and Houweling, S. and Josse, B. and Fraser, P. J. and Krummel, P. B. and Lamarque, J.-F. and Langenfelds, R. L. and Le Quéré, C. and Naik, V. and O'Doherty, S. and Palmer, P. I. and Pison, I. and Plummer, D. and Poulter, B. and Prinn, R. G. and Rigby, M. and Ringeval, B. and Santini, M. and Schmidt, M. and Shindell, D. T. and Simpson, I. J. and Spahni, R. and Steele, L. P. and Strode, S. A. and Sudo, K. and Szopa, S. and van der Werf, G. R. and Voulgarakis, A. and van Weele, M. and Weiss, R. F. and Williams, J. E. and Zeng, G.},
  title={Three decades of global methane sources and sinks},
  journal={Nat. Geosci.},

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RIS Citation

ID  - ki06100f
AU  - Kirschke, S.
AU  - Bousquet, P.
AU  - Ciais, P.
AU  - Saunois, M.
AU  - Canadell, J. G.
AU  - Dlugokencky, E. J.
AU  - Bergamaschi, P.
AU  - Bergmann, D.
AU  - Blake, D. R.
AU  - Bruhwiler, L.
AU  - Cameron-Smith, P.
AU  - Castaldi, S.
AU  - Chevallier, F.
AU  - Feng, L.
AU  - Fraser, A.
AU  - Heimann, M.
AU  - Hodson, E. L.
AU  - Houweling, S.
AU  - Josse, B.
AU  - Fraser, P. J.
AU  - Krummel, P. B.
AU  - Lamarque, J.-F.
AU  - Langenfelds, R. L.
AU  - Le Quéré, C.
AU  - Naik, V.
AU  - O'Doherty, S.
AU  - Palmer, P. I.
AU  - Pison, I.
AU  - Plummer, D.
AU  - Poulter, B.
AU  - Prinn, R. G.
AU  - Rigby, M.
AU  - Ringeval, B.
AU  - Santini, M.
AU  - Schmidt, M.
AU  - Shindell, D. T.
AU  - Simpson, I. J.
AU  - Spahni, R.
AU  - Steele, L. P.
AU  - Strode, S. A.
AU  - Sudo, K.
AU  - Szopa, S.
AU  - van der Werf, G. R.
AU  - Voulgarakis, A.
AU  - van Weele, M.
AU  - Weiss, R. F.
AU  - Williams, J. E.
AU  - Zeng, G.
PY  - 2013
TI  - Three decades of global methane sources and sinks
JA  - Nat. Geosci.
VL  - 6
SP  - 813
EP  - 823
DO  - 10.1038/ngeo1955
ER  -

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