Determining the flux of methane into Hudson Canyon at the edge of methane clathrate hydrate stability
Ruppel, Carolyn D.
Weber, Thomas C.
Kellermann, Matthias Y.
Arrington, Eleanor C.
Valentine, David L.
Scranton, Mary I.
Kessler, John D.
MetadataShow full item record
Methane seeps were investigated in Hudson Canyon, the largest shelf-break canyon on the northern U.S. Atlantic Margin. The seeps investigated are located at or updip of the nominal limit of methane clathrate hydrate stability. The acoustic identification of bubble streams was used to guide water column sampling in a 32 km2 region within the canyon's thalweg. By incorporating measurements of dissolved methane concentration with methane oxidation rates and current velocity into a steady state box model, the total emission of methane to the water column in this region was estimated to be 12 kmol methane per day (range: 6–24 kmol methane per day). These analyses suggest that the emitted methane is largely retained inside the canyon walls below 300 m water depth, and that it is aerobically oxidized to near completion within the larger extent of Hudson Canyon. Based on estimated methane emissions and measured oxidation rates, the oxidation of this methane to dissolved CO2 is expected to have minimal influences on seawater pH.
Author Posting. © American Geophysical Union, 2016. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry, Geophysics, Geosystems 17 (2016): 3882–3892, doi:10.1002/2016GC006421.
Suggested CitationGeochemistry, Geophysics, Geosystems 17 (2016): 3882–3892
Showing items related by title, author, creator and subject.
Hotchkiss, Frances Luellen Stephenson (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 1982-05)Velocity and temperature time series from Hudson Submarine Canyon and hydrographic surveys of seven canyons of the Middle Atlantic Bight indicate that the effects of storms, tides, and incoming internal waves are intensified ...
Radiocarbon DIC, DIC concentration, pH, and [CH4] in Hudson Canyon, northern US Atlantic Margin collected from R/V Endeavor cruise EN541 in July 2014 Kessler, John D. (Biological and Chemical Oceanography Data Management Office (BCO-DMO). Contact: firstname.lastname@example.org, 2019-11-15)Radiocarbon DIC, DIC concentration, pH, and [CH4] in Hudson Canyon, northern US Atlantic Margin collected from R/V Endeavor cruise EN541 in July 2014. For a complete list of measurements, refer to the full dataset ...
Modeling sulfate reduction in methane hydrate-bearing continental margin sediments : does a sulfate-methane transition require anaerobic oxidation of methane? Malinverno, Alberto; Pohlman, John W. (American Geophysical Union, 2011-07-12)The sulfate-methane transition (SMT), a biogeochemical zone where sulfate and methane are metabolized, is commonly observed at shallow depths (1–30 mbsf) in methane-bearing marine sediments. Two processes consume sulfate ...