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Title: Determining the flux of methane into Hudson Canyon at the edge of methane clathrate hydrate stability: METHANE FLUX INTO HUDSON CANYON

Abstract

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 km 2 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 CO 2 is expected to have minimal influences on seawater pH.

Authors:
 [1];  [1];  [2];  [3];  [1];  [4];  [4];  [4];  [5];  [1]
  1. Univ. of Rochester, NY (United States)
  2. U.S. Geological Survey, Woods Hole, MA (United States)
  3. Univ. of New Hampshire, Durham, NH (United States)
  4. Univ. of California, Santa Barbara, CA (United States)
  5. Stony Brook Univ., NY (United States)
Publication Date:
Research Org.:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States); U.S. Geological Survey, Boulder, CO (United States); USGS Eastern Region, Kearneysville, WV (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1532975
Grant/Contract Number:  
FE0013999; FE0002911; FE0005806
Resource Type:
Accepted Manuscript
Journal Name:
Geochemistry, Geophysics, Geosystems
Additional Journal Information:
Journal Volume: 17; Journal Issue: 10; Journal ID: ISSN 1525-2027
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Geochemistry & Geophysics

Citation Formats

Weinstein, Alexander, Navarrete, Luis, Ruppel, Carolyn, Weber, Thomas C., Leonte, Mihai, Kellermann, Matthias Y., Arrington, Eleanor C., Valentine, David L., Scranton, Mary I., and Kessler, John D. Determining the flux of methane into Hudson Canyon at the edge of methane clathrate hydrate stability: METHANE FLUX INTO HUDSON CANYON. United States: N. p., 2016. Web. doi:10.1002/2016gc006421.
Weinstein, Alexander, Navarrete, Luis, Ruppel, Carolyn, Weber, Thomas C., Leonte, Mihai, Kellermann, Matthias Y., Arrington, Eleanor C., Valentine, David L., Scranton, Mary I., & Kessler, John D. Determining the flux of methane into Hudson Canyon at the edge of methane clathrate hydrate stability: METHANE FLUX INTO HUDSON CANYON. United States. doi:10.1002/2016gc006421.
Weinstein, Alexander, Navarrete, Luis, Ruppel, Carolyn, Weber, Thomas C., Leonte, Mihai, Kellermann, Matthias Y., Arrington, Eleanor C., Valentine, David L., Scranton, Mary I., and Kessler, John D. Mon . "Determining the flux of methane into Hudson Canyon at the edge of methane clathrate hydrate stability: METHANE FLUX INTO HUDSON CANYON". United States. doi:10.1002/2016gc006421. https://www.osti.gov/servlets/purl/1532975.
@article{osti_1532975,
title = {Determining the flux of methane into Hudson Canyon at the edge of methane clathrate hydrate stability: METHANE FLUX INTO HUDSON CANYON},
author = {Weinstein, Alexander and Navarrete, Luis and Ruppel, Carolyn and Weber, Thomas C. and Leonte, Mihai and Kellermann, Matthias Y. and Arrington, Eleanor C. and Valentine, David L. and Scranton, Mary I. and Kessler, John D.},
abstractNote = {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.},
doi = {10.1002/2016gc006421},
journal = {Geochemistry, Geophysics, Geosystems},
number = 10,
volume = 17,
place = {United States},
year = {2016},
month = {8}
}

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Works referenced in this record:

Propane Respiration Jump-Starts Microbial Response to a Deep Oil Spill
journal, September 2010

  • Valentine, David L.; Kessler, John D.; Redmond, Molly C.
  • Science, Vol. 330, Issue 6001, p. 208-211
  • DOI: 10.1126/science.1196830