Consumption of atmospheric methane by soils: A process-based model
Article first published online: 21 SEP 2012
Copyright 1999 by the American Geophysical Union.
Global Biogeochemical Cycles
Volume 13, Issue 1, pages 59–70, March 1999
How to Cite
1999), Consumption of atmospheric methane by soils: A process-based model, Global Biogeochem. Cycles, 13(1), 59–70, doi:10.1029/1998GB900004., , and (
- Issue published online: 21 SEP 2012
- Article first published online: 21 SEP 2012
- Manuscript Accepted: 11 SEP 1998
- Manuscript Received: 2 JAN 1998
A process-based model for the consumption of atmospheric methane (CH4) by soils was developed to identify the most important factors affecting uptake rates and to determine whether the current uncertainties in the estimated size of the global soil sink might be reduced. Descriptions of diffusion and microbial oxidation processes, which together determine the CH4 flux, were included. The results suggest that the global sink strength lies within the range 20–51 Tg yr−1 CH4, with a preferred value of 38 Tg yr−1 CH4. Dry tropical ecosystems account for almost a third of this total. Here microbial activity rather than diffusion is limiting uptake. It is also in these areas that the impact of any intensification in agriculture will be the most pronounced, with a possible future reduction in uptake in excess of 3 Tg yr−1 CH4. This is in contrast to the overall impact of global warming, which is expected to leave the size of the global soil sink relatively unchanged.