Water ecosystems of Arctic region are most vulnerable to modern climatic changes, since global biogeochemical processes mostly occur on territories of permafrost zone. This work gives new insights into fundamental research question of how fast organic matter of thawing permafrost can be converted to greenhouse gases which are emitted into the atmosphere (for example, CH4). We aimed to identify microbial response and associated release of CH4 from Arctic lakes in response to temperature increase. We investigated lakes located in the Lena River delta on the Samoylov Island, Russia, at 72°22’N, 126°28’E. Bottom sediments from three thermokarst and three oxbow lakes were anaerobically incubated in laboratory at two temperature regimes (at 4 °C and at 25 °C). We identified different metabolic pathways of methane formation in thermokarst and oxbow lakes using the analysis of carbon isotopic composition in methane during the incubation period. Temperature increase caused methane emission from sediments of all of the lake types to rise. Our results suggest that in case of the global warming both thermokarst and oxbow lakes could become a great source of methane into the atmosphere.

Original languageEnglish
Title of host publication20th International Multidisciplinary Scientific Geoconference: Water Resources, Forest, Marine and Ocean Ecosystems, SGEM 2020
Pages3-10
Number of pages8
Volume2020-August
Edition3.1
DOIs
StatePublished - 2020
Event20th International Multidisciplinary Scientific Geoconference: Water Resources, Forest, Marine and Ocean Ecosystems, SGEM 2020 - Albena, Bulgaria
Duration: 18 Aug 202024 Aug 2020

Publication series

NameInternational Multidisciplinary Scientific GeoConference Surveying Geology and Mining Ecology Management, SGEM
PublisherInternational Multidisciplinary Scientific Geoconference
ISSN (Print)1314-2704

Conference

Conference20th International Multidisciplinary Scientific Geoconference: Water Resources, Forest, Marine and Ocean Ecosystems, SGEM 2020
Country/TerritoryBulgaria
CityAlbena
Period18/08/2024/08/20

    Research areas

  • C-CH4C-CH4, Incubation experiments, Methane, Permafrost lakes, Sediments

    Scopus subject areas

  • Geotechnical Engineering and Engineering Geology
  • Geology

ID: 85870186