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@ARTICLE{Basu:186436,
      author       = {Basu, A. and Schultz, Martin and Schröder, S. and
                      Francois, L. and Zhang, X. and Lohmann, G. and Laepple, T.},
      title        = {{A}nalysis of the global atmospheric methane budget using
                      {ECHAM}-{MOZ} simulations for present-day, pre-industrial
                      time and the {L}ast {G}lacial {M}aximum},
      journal      = {Atmospheric chemistry and physics / Discussions},
      volume       = {14},
      number       = {2},
      issn         = {1680-7375},
      address      = {Katlenburg-Lindau},
      publisher    = {EGU},
      reportid     = {FZJ-2015-00512},
      pages        = {3193 - 3230},
      year         = {2014},
      abstract     = {Atmospheric methane concentrations increased considerably
                      from pre-industrial (PI) to present times largely due to
                      anthropogenic emissions. However, firn and ice core records
                      also document a notable rise of methane levels between the
                      Last Glacial Maximum (LGM) and the pre-industrial era, the
                      exact cause of which is not entirely clear. This study
                      investigates these changes by analyzing the methane sources
                      and sinks at each of these climatic periods. Wetlands are
                      the largest natural source of methane and play a key role in
                      determining methane budget changes in particular in the
                      absence of anthropogenic sources. Here, a simple wetland
                      parameterization suitable for coarse-scale climate
                      simulations over long periods is introduced, which is
                      derived from a high-resolution map of surface slopes
                      together with various soil hydrology parameters from the
                      CARAIB vegetation model. This parameterization was
                      implemented in the chemistry general circulation model
                      ECHAM5-MOZ and multi-year time slices were run for LGM, PI
                      and present-day (PD) climate conditions. Global wetland
                      emissions from our parameterization are 72 Tg yr−1 (LGM),
                      115 Tg yr−1 (PI), and 132 Tg yr−1 (PD). These estimates
                      are lower than most previous studies, and we find a stronger
                      increase of methane emissions between LGM and PI. Taking
                      into account recent findings that suggest more stable OH
                      concentrations than assumed in previous studies, the
                      observed methane distributions are nevertheless well
                      reproduced under the different climates. Hence, this is one
                      of the first studies where a consistent model approach has
                      been successfully applied for simulating methane
                      concentrations over a wide range of climate conditions.},
      cin          = {IEK-8},
      ddc          = {550},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {233 - Trace gas and aerosol processes in the troposphere
                      (POF2-233)},
      pid          = {G:(DE-HGF)POF2-233},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.5194/acpd-14-3193-2014},
      url          = {https://juser.fz-juelich.de/record/186436},
}