Release of multiple bubbles from cohesive sediments

Details Release of multiple bubbles from cohesive sediments Release of multiple bubbles from cohesive sediments

Apr 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3808606a&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 8, CiteID L08606

Mathematics

Logic

Marine Geology And Geophysics: Gas And Hydrate Systems, Marine Geology And Geophysics: Marine Sediments: Processes And Transport, Oceanography: Biological And Chemical: Benthic Processes, Benthos (0408), Geochemistry: Sedimentary Geochemistry

Scientific paper

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.

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