Geochemical, sedimentological and microbial diversity in two thermokarst lakes of far Eastern Siberia ...

• Main Authors: Meisel, Ove H., Rijkers, Ruud, Dean, Joshua F., In 't Zandt, Michiel H., van Huissteden, Jacobus, Maximov, Trofim C., Karsanaev, Sergey V., Belelli Marchesini, Luca, Goovaerts, Arne, Wacker, Lukas, Reichart, Gert-Jan, Bouillon, Steven, Welte, Cornelia U., Jetten, Mike S.M., Vonk, Jorien E., Dolman, Han
• Format: Article in Journal/Newspaper
• Language: English
• Published: ETH Zurich 2023
• Subjects: Thermokarst lakes; Far East Siberia; Arctic permafrost; Yedoma; SOC; Microbial diversity; Arctic; Ice; permafrost; Thermokarst; Siberia
• Online Access: https://dx.doi.org/10.3929/ethz-b-000637399; http://hdl.handle.net/20.500.11850/637399

Thermokarst lakes are important conduits for organic carbon sequestration, soil organic matter (soil-OM) decomposition and release of atmospheric greenhouse gases in the Arctic. They can be classified as either floating-ice lakes, which sustain a zone of unfrozen sediment (talik) at the lakebed year-round, or as bedfast-ice lakes, which freeze all the way to the lakebed in winter. Another key characteristic of thermokarst lakes are their eroding shorelines, depending on the surrounding landscape, they can play a major role in supplying the lakebeds with sediment and OM. These differences in winter ice regime and eroding shorelines are key factors which determine the quantity and quality of OM in thermokarst lake sediments. We used an array of physical, geochemical, and microbiological tools to identify the differences in the environmental conditions, sedimentary characteristics, carbon stocks and microbial community compositions in the sediments of a bedfast-ice and a floating-ice lake in Far East Siberia ... : Biogeochemistry, 165 ...