Release of multiple bubbles from cohesive sediments
Article first published online: 20 APR 2011
Copyright 2011 by the American Geophysical Union.
Geophysical Research Letters
Volume 38, Issue 8, April 2011
How to Cite
2011), Release of multiple bubbles from cohesive sediments, Geophys. Res. Lett., 38, L08606, doi:10.1029/2011GL046870., , and (
- Issue published online: 20 APR 2011
- Article first published online: 20 APR 2011
- Manuscript Accepted: 15 MAR 2011
- Manuscript Revised: 10 MAR 2011
- Manuscript Received: 25 JAN 2011
 Methane is a strong greenhouse gas, and marine and wetland sediments constitute significant sources to the atmosphere. This flux is dominated by the release of bubbles, and quantitative prediction of this bubble flux has been elusive because of the lack of a mechanistic model. Our previous work has shown that sediments behave as elastic fracturing solids during bubble growth and rise. We now further argue that bubbles can open previously formed, partially annealed, rise tracts (fractures) and that this mechanism can account for the observed preferential release at low tides in marine settings. When this mechanical model is applied to data from Cape Lookout Bight, NC (USA), the results indicate that methanogenic bubbles released at this site do indeed follow previously formed rise tracts and that the calculated release rates are entirely consistent with the rise of multiple bubbles on tidal time scales. Our model forms a basis for making predictions of future bubble fluxes from warming sediments under the influence of climate change.