A two-dimensional model of a sediment column, with Darcy fluid flow, biological and thermal
methane production, and permafrost and methane hydrate formation, is subjected to glacial–
interglacial cycles in sea level, alternately exposing the continental shelf to the cold
atmosphere during glacial times and immersing it in the ocean in interglacial times. The
glacial cycles are followed by a" long-tail" 100 kyr warming due to fossil fuel combustion.
The salinity of the sediment column in the interior of the shelf can be decreased by …

A two-dimensional model of a passive continental margin was adapted to the simulation of
the methane cycle on Siberian continental shelf and slope, attempting to account for the
impacts of glacial/interglacial cycles in sea level, alternately exposing the continental shelf to
freezing conditions with deep permafrost formation during glacial times, and 5 immersion in
the ocean in interglacial times. The model is used to gauge the impact of the glacial cycles,
and potential anthropogenic warming in the deep future, on the atmospheric methane …