Sulfur and oxygen isotope tracing of sulfate driven anaerobic methane oxidation in estuarine sediments

Antler, Gilad and Turchyn, Alexandra V. and Herut, Barak and Davies, Alicia and Rennie, Victoria C. F. and Sivan, Orit (2014) Sulfur and oxygen isotope tracing of sulfate driven anaerobic methane oxidation in estuarine sediments. Estuarine, Coastal and Shelf Science, 142. pp. 4-11. ISSN 0272-7714, ESSN: 1096-0015 DOI 10.1016/j.ecss.2014.03.001

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Abstract

We use multiple stable isotope measurements in two highly stratified estuaries located along the Mediterranean coast of Israel (the Yarqon and the Qishon) to explore the consumption of sulfate through the anaerobic oxidation of methane (sulfate-driven AOM). At both sites, pore fluid sulfate is rapidly consumed within the upper 15–20 cm. Although the pore fluid sulfate and dissolved inorganic carbon (DIC) concentration profiles change over a similar range with respect to depth, the sulfur and oxygen isotopes in the pore fluid sulfate and the carbon isotopes in the pore fluid DIC are fundamentally different. This pore fluid isotope geochemistry indicates that the microbial mechanism of sulfate reduction differs between the studied sites. We suggest that in the Yarqon estuary, sulfate is consumed entirely through AOM, whereas in the Qishon, both AOM and bacterial sulfate reduction through organic matter oxidation coexist. These results have implications for understanding the microbial mechanisms behind sulfate-driven AOM. Our data compilation from marine and marginal marine environments supports the conclusion that the intracellular pathways of sulfate reduction varies among environments with sulfate-driven AOM. The data can be used to elucidate new pathways in the cycling of methane and sulfate, and the findings are applicable to the broader marine environment.

Item Type: Article
Uncontrolled Keywords: 2013AREP; IA67; phd.,
Subjects: 01 - Climate Change and Earth-Ocean Atmosphere Systems
06 - Part-III Projects
Divisions: 01 - Climate Change and Earth-Ocean Atmosphere Systems
07 - Gold Open Access
06 - Part-III Projects
Journal or Publication Title: Estuarine, Coastal and Shelf Science
Volume: 142
Page Range: pp. 4-11
Identification Number: 10.1016/j.ecss.2014.03.001
Depositing User: Sarah Humbert
Date Deposited: 11 Apr 2014 16:13
Last Modified: 17 Feb 2017 12:15
URI: http://eprints.esc.cam.ac.uk/id/eprint/3014

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