A Sediment-Flow-Through-System to investigate the efficiency of the benthic microbial methane filter

Steeb, Philip, Linke, Peter, Reischke, Stephanie and Treude, Tina (2010) A Sediment-Flow-Through-System to investigate the efficiency of the benthic microbial methane filter [Talk] In: SFB 574 Subduction Workshop, 04.-07.11.2010, Pucon, Chile.

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Abstract

As a consequence of sediment compaction at the forearc of subduction zones, fluids ascend in sediments and are discharged in cold seeps. These fluids include the greenhouse gas methane, which is to a larger proportion
depleted by anaerobic oxidization of methane (AOM) next to sediment-water interface. This microbial methane filter consists of archaea (methane oxidizers) and bacteria (sulfate reducers) that are living in syntrophic consortia. During AOM, the microbes produce hydrogen sulfide, which feeds chemoautotrophic “seep-organism”. A new sediment-flow-through-system was developed, to investigate the
efficiency of AOM, the range of methane turnover rates, as well as key parameters controlling microbial filter. The system includes two different seawater media. The first medium supplies the microbes with sulfate from the top, (transported by diffusion); the second carries methane and is supplied from the bottom by advective transport. Sampling holes, sealed with silicon, allow the measurement of key parameters such as sulfate, sulfide, pH, redox
potential, and total alkalinity as well as sediment sub-sampling to determine the abundance, e.g., of methanotrophic microbial groups. In this presentation the technical details of the sediment-flow-through-system
will be introduced. Preliminary results from the first experiments with seep sediments and insights into ongoing studies will be provided.

Document Type: Conference or Workshop Item (Talk)
Research affiliation: OceanRep > GEOMAR
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-JRG-A2 Seafloor Warming
OceanRep > SFB 574
OceanRep > SFB 574 > B3
Date Deposited: 07 Dec 2010 13:02
Last Modified: 23 Feb 2012 05:20
URI: http://eprints.uni-kiel.de/id/eprint/10380

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