Biogeochemical cycling in an organic-rich coastal marine basin--3. Dissolved gas transport in methane-saturated sediments

Details Biogeochemical cycling in an organic-rich coastal marine basin--3. Dissolved gas transport in methane-saturated sediments Biogeochemical cycling in an organic-rich coastal marine basin--3. Dissolved gas transport in methane-saturated sediments

Nov 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982gecoa..46.2049k&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 46, Issue 11, pp.2049-2060

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6

Scientific paper

The transport of dissolved gases in the anoxic sediments of Cape Lookout Bight, North Carolina, is controlled by diffusion and bubble ebullition and exhibits a distinct seasonal cycle. Detailed seasonal profiles of CH 4 , N 2 and 222 Rn and direct gas flux measurements indicate that ebullition dominates the flux of all dissolved gases across the sediment-water interface during summer months, and is of major importance on an annual basis. Transport within the upper 6-8 cm of sediment appears to be controlled by molecular diffusion of gases. Transport at greater depths is controlled by diffusion in winter and ebullition in summer. Rn-222 profiles were used to estimate the rate of stripping of dissolved gases within the CH 4 production zone (10-30 cm); rates averaged 3-5 percent per day and agreed with estimates derived from N 2 profiles. As a result of summer ebullition, the sediments of the bight are never at saturation with respect to the major gases present in seawater. Evidence from other sites suggests that ebullition may be an important transport process in many coastal sediments, and may provide mechanism for the transport of volatile reduced compounds between anoxic sediments and the atmosphere. 222 Rn is a useful tracer for quantifying this transport.

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