Next Article in Journal
Business Models in the Smart Grid: Challenges, Opportunities and Proposals for Prosumer Profitability
Next Article in Special Issue
Experimental Investigation into the Combustion Characteristics of Propane Hydrates in Porous Media
Previous Article in Journal
Optimization of Design Pressure Ratio of Positive Displacement Expander for Vehicle Engine Waste Heat Recovery
Previous Article in Special Issue
Contribution of Vertical Methane Flux to Shallow Sediment Carbon Pools across Porangahau Ridge, New Zealand
Article Menu

Export Article

Open AccessArticle
Energies 2014, 7(9), 6118-6141; doi:10.3390/en7096118

Methane Flux and Authigenic Carbonate in Shallow Sediments Overlying Methane Hydrate Bearing Strata in Alaminos Canyon, Gulf of Mexico

1
Oceanography Department, U.S. Naval Academy, 572C Holloway Road, Annapolis, MD 21402, USA
2
Marine Biogeochemistry (Code 6114), U.S. Naval Research Laboratory, Washington, DC 20375, USA
Current Address: Department of Physical and Environment Sciences, Texas A&M University-Corpus Christi, Corpus Christi, TX 78412, USA
*
Author to whom correspondence should be addressed.
Received: 11 August 2014 / Revised: 4 September 2014 / Accepted: 9 September 2014 / Published: 23 September 2014
(This article belongs to the Special Issue Coastal Ocean Natural Gas Hydrate 2014)
View Full-Text   |   Download PDF [4789 KB, uploaded 17 March 2015]   |  

Abstract

In June 2007 sediment cores were collected in Alaminos Canyon, Gulf of Mexico across a series of seismic data profiles indicating rapid transitions between the presence of methane hydrates and vertical gas flux. Vertical profiles of dissolved sulfate, chloride, calcium, magnesium, and dissolved inorganic carbon (DIC) concentrations in porewaters, headspace methane, and solid phase carbonate concentrations were measured at each core location to investigate the cycling of methane-derived carbon in shallow sediments overlying the hydrate bearing strata. When integrated with stable carbon isotope ratios of DIC, geochemical results suggest a significant fraction of the methane flux at this site is cycled into the inorganic carbon pool. The incorporation of methane-derived carbon into dissolved and solid inorganic carbon phases represents a significant sink in local carbon cycling and plays a role in regulating the flux of methane to the overlying water column at Alaminos Canyon. Targeted, high-resolution geochemical characterization of the biogeochemical cycling of methane-derived carbon in shallow sediments overlying hydrate bearing strata like those in Alaminos Canyon is critical to quantifying methane flux and estimating methane hydrate distributions in gas hydrate bearing marine sediments. View Full-Text
Keywords: methane; hydrate; Gulf of Mexico; Alaminos Canyon; sediments; porewaters; carbon cycling methane; hydrate; Gulf of Mexico; Alaminos Canyon; sediments; porewaters; carbon cycling
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Smith, J.P.; Coffin, R.B. Methane Flux and Authigenic Carbonate in Shallow Sediments Overlying Methane Hydrate Bearing Strata in Alaminos Canyon, Gulf of Mexico. Energies 2014, 7, 6118-6141.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Energies EISSN 1996-1073 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top