Stable isotope tracing of anaerobic methane oxidation in the gassy sediments of Eckernfoerde Bay, German Baltic Sea

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ID: 293421
1999
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Abstract
Methane concentrations in the pore waters of Eckernfoerde Bay in the German Baltic Sea generally reach gas bubble saturation values within the upper meter of the sediment column. The depth at which saturation occurs is controlled by a balance between rates of methane production, consumption (oxidation), and transport. The relative importance of anaerobic methane oxidation (AMO) in controlling dissolved and gas bubble methane distributions in the bay's sediments is indirectly revealed through methane concentration versus depth profiles, depth variations in the stable C and H isotope composition of methane, and the C isotope composition of total dissolved inorganic carbon ({Sigma}CO{sub 2}). Direct radiotracer measurements indicate that AMO rates of over 15 mM/yr are focused at the base of the sulfate reduction zone. Diagenetic equations that describe the depth destructions of the {delta}{sup 13}C and {delta}D values of methane reproduce isotopic shifts observed throughout the methane oxidation zone and are best fit with kinetic isotope fractionation factors of 1.012 {+-} 0.001 and 1.120 {plus{underscore}minus} 0.020 respectively.
Reference Key
openalex_W2076797128 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Christopher S. Martens, Daniel B. Albert, Marc J. Alperin
Journal american journal of science
Year 1999
DOI
10.2475/ajs.299.7-9.589
URL
https://doi.org/10.2475/ajs.299.7-9.589
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