Biogeochemical features of sediments of thermokarst lakes in the Northern part of Western Siberia

Lead Author Rinat, Manasypov
Institution Contact BIO-GEO-CLIM Laboratory, Tomsk State University, Lenina av., 36, Tomsk, Russia
Co-Authors Oleg Pokrovsky, Tomsk State University, Russia Sergey Kirpotin, Tomsk State University, Russia Artyom Lim, Tomsk State University, Russia
Theme Theme 1: Vulnerability of Arctic Environments
Session Name 1.3 Siberian Inland Waters: Vulnerability to Global Change and Human Impact
Datetime Thu, Sep 15, 2016 11:45 AM - 12:00 PM
Presentation Type Oral
Abstract text In the bottom sediments of thermokarst lakes in Northern part of West Siberia we studied organic carbon, heavy metals and metalloids, which are among the main components of air emissions and concentrations of Fe and Mn, which play an important role in the adsorption of heavy metals in sediments. Anaerobic degradation of organic matter is a predominant condition in this region. This process does not provide a complete decomposition of oxidized-matter and the organic material does not decompose to fine particles. The high values of the organic carbon content, not only in the surface but also in the lowest sedimentation layer (up to 20 cm), is a confirmation of the incomplete degradation of organic material in an aqueous medium. Iron and manganese are typomorphic elements for this region. Their concentration and migration properties largely determines the geochemical conditions that we investigated in thermokarst ecosystems. An high correlation shows that, in this region, the level of trace-elements is regulated by the organic carbon content and typomorphic elements (Fe and Mn).
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