Journal cover Journal topic
Biogeosciences An interactive open-access journal of the European Geosciences Union
Journal topic
Volume 9, issue 5
Biogeosciences, 9, 1915-1933, 2012
https://doi.org/10.5194/bg-9-1915-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 9, 1915-1933, 2012
https://doi.org/10.5194/bg-9-1915-2012
© Author(s) 2012. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 30 May 2012

Research article | 30 May 2012

Timescales for the development of methanogenesis and free gas layers in recently-deposited sediments of Arkona Basin (Baltic Sea)

J. M. Mogollón1,*, A. W. Dale2, H. Fossing3, and P. Regnier1,4 J. M. Mogollón et al.
  • 1Department of Earth Sciences – Geochemistry, Utrecht University, P.O. Box 80.021, 3508TA Utrecht, The Netherlands
  • 2Helmholtz-Zentrum für Ozeanforschung Kiel (GEOMAR), Kiel, Germany
  • 3National Environmental Research Institute, Department of Marine Ecology, Aarhus University, Aarhus, Denmark
  • 4Département des Sciences de la Terre et de l'Environnement, Université Libre de Bruxelles, Brussels, Belgium
  • *now at: Marine Geochemistry, Alfred Wegener Institute for Polar and Marine Research (AWI), Bremerhaven, Germany

Abstract. Arkona Basin (southwestern Baltic Sea) is a seasonally-hypoxic basin characterized by the presence of free methane gas in its youngest organic-rich muddy stratum. Through the use of reactive transport models, this study tracks the development of the methane geochemistry in Arkona Basin as this muddy sediment became deposited during the last 8 kyr. Four cores are modeled each pertaining to a unique geochemical scenario according to their respective contemporary geochemical profiles. Ultimately the thickness of the muddy sediment and the flux of particulate organic carbon are crucial in determining the advent of both methanogenesis and free methane gas, the timescales over which methanogenesis takes over as a dominant reaction pathway for organic matter degradation, and the timescales required for free methane gas to form.

Publications Copernicus
Download
Citation
Share