Active Methane Venting Observed at Giant Pockmarks Along the U.S. Mid-Atlantic Shelf Break
dc.contributor.author | Newman, Kori R. | en_US |
dc.contributor.author | Cormier, Marie-Helene | en_US |
dc.contributor.author | Weissel, Jeffrey K. | en_US |
dc.contributor.author | Driscoll, Neal W. | en_US |
dc.contributor.author | Kastner, Miriam | en_US |
dc.contributor.author | Solomon, Evan A. | en_US |
dc.contributor.author | Robertson, Gretchen | en_US |
dc.contributor.author | Hill, Jenna C. | en_US |
dc.contributor.author | Singh, Hanumant | en_US |
dc.contributor.author | Camilli, Richard | en_US |
dc.contributor.author | Eustice, Ryan M. | en_US |
dc.date.accessioned | 2011-08-18T18:24:38Z | |
dc.date.available | 2011-08-18T18:24:38Z | |
dc.date.issued | 2007-12-14 | en_US |
dc.identifier.citation | Newman, K. R.; Cormier, M-H; Weissel, J. K.; Driscoll, N. W.; Kastner, M.; Solomon, E. A.; Robertson, G.; Hill, J. C.; Singh, H.; Camilli, R.; Eustice, R. (2008). "Active Methane Venting Observed at Giant Pockmarks Along the U.S. Mid-Atlantic Shelf Break." Earth and Planetary Science Letters 267(1-2): 341-352. <http://hdl.handle.net/2027.42/86052> | en_US |
dc.identifier.issn | 0012-821X 1385-013X (online) | en_US |
dc.identifier.uri | https://hdl.handle.net/2027.42/86052 | |
dc.description.abstract | Detailed near-bottom investigation of a series of giant, kilometer scale, elongate pockmarks along the edge of the mid-Atlantic continental shelf confirms that methane is actively venting at the site. Dissolved methane concentrations, which were measured with a commercially available methane sensor (METS) designed by Franatech GmbH mounted on an Autonomous Underwater Vehicle (AUV), are as high as 100 nM. These values are well above expected background levels (1–4 nM) for the open ocean. Sediment pore water geochemistry gives further evidence of methane advection through the seafloor. Isotopically light carbon in the dissolved methane samples indicates a primarily biogenic source. The spatial distribution of the near-bottom methane anomalies (concentrations above open ocean background), combined with water column salinity and temperature vertical profiles, indicate that methane-rich water is not present across the entire width of the pockmarks, but is laterally restricted to their edges. We suggest that venting is primarily along the top of the pockmark walls with some advection and dispersion due to local currents. The highest methane concentrations observed with the METS sensor occur at a small, circular pockmark at the southern end of the study area. This observation is compatible with a scenario where the larger, elongate pockmarks evolve through coalescing smaller pockmarks. | en_US |
dc.publisher | Elsevier | en_US |
dc.title | Active Methane Venting Observed at Giant Pockmarks Along the U.S. Mid-Atlantic Shelf Break | en_US |
dc.type | Article | en_US |
dc.subject.hlbsecondlevel | Naval Architecture and Marine Engineering | en_US |
dc.subject.hlbtoplevel | Engineering | en_US |
dc.description.peerreviewed | Peer Reviewed | en_US |
dc.contributor.affiliationother | Lamont-Doherty Earth Observatory of Columbia University, Palisades, NY 10964, United States. Department of Earth and Environmental Sciences, Columbia University, New York, NY 10027, United States. Scripps Institution of Oceanography, La Jolla, CA 92093, United States. Woods Hole Oceanographic Institution, Woods Hole, MA 02543, United States. | en_US |
dc.description.bitstreamurl | http://deepblue.lib.umich.edu/bitstream/2027.42/86052/1/knewman-18.pdf | |
dc.identifier.doi | 10.1016/j.epsl.2007.11.053 | en_US |
dc.identifier.source | Earth and Planetary Science Letters | en_US |
dc.owningcollname | Electrical Engineering and Computer Science, Department of (EECS) |
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