Persistence of bubble outlets in soft, methane-generating sediments

Scandella, Benjamin P.; Delwiche, Kyle; Hemond, Harold F.; Juanes, Ruben

doi:10.1002/2016JG003717

Title: Persistence of bubble outlets in soft, methane-generating sediments

Journal Article · Fri Apr 21 00:00:00 EDT 2017 · Journal of Geophysical Research. Biogeosciences

DOI:https://doi.org/10.1002/2016JG003717· OSTI ID:1466702

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^[1]; Hemond, Harold F. ^[1];

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Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Civil and Environmental Engineering
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States). Dept. of Civil and Environmental Engineering. Dept. of Earth, Atmospheric and Planetary Sciences

Abstract Sediments submerged beneath many inland waterways and shallow oceans emit methane, a potent greenhouse gas, but the magnitude of the methane flux to the atmosphere remains poorly constrained. In many settings, the majority of methane is released through bubbling, and the spatiotemporal heterogeneity of this ebullition both presents challenges for measurement and impacts bubble dissolution and atmospheric emissions. Here we present laboratory‐scale experiments of methane ebullition in a controlled incubation of reconstituted sediments from a eutrophic lake. Image analysis of a 0.14 m ² sediment surface area allowed identification of individual bubble outlets and resolved their location to ∼1 cm. While ebullition events were typically concentrated in bursts lasting ∼2 min, some major outlets showed persistent activity over the scale of days and even months. This persistence was surprising given the previously observed ephemerality of spatial structure at the field scale. This persistence suggests that, at the centimeter scale, conduits are reopened as a result of a drop in tensile strength due to deformation of sediments by the rising bubbles. The mechanistic insight from this work sheds light on the spatiotemporal distribution of methane venting from organic‐rich sediments and has important implications for bubble survival in the water column and associated biogeochemical pathways of methane.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Fossil Energy (FE); National Science Foundation (NSF); USDOE

Grant/Contract Number:: FE0013999; 1045193

OSTI ID:: 1466702

Alternate ID(s):: OSTI ID: 1402403

Journal Information:: Journal of Geophysical Research. Biogeosciences, Vol. 122, Issue 6; ISSN 2169-8953

Publisher:: American Geophysical UnionCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 21 works

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