Journal
JOURNAL OF GEOPHYSICAL RESEARCH-BIOGEOSCIENCES
Volume 121, Issue 10, Pages 2652-2666Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1002/2016JG003483
Keywords
phospholipids; phospholipid fatty acids; GDGTs; carbon quality; Arctic permafrost; greenhouse gas potential
Funding
- German Ministry of Education and Research (CarboPerm Project)
- European Research Council Starting Grant (PETA-CARB) [338335]
- Initiative and Networking Fund of the Helmholtz Association [ERC-0013]
- European Research Council (ERC) [338335] Funding Source: European Research Council (ERC)
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A terrestrial permafrost core from Buor Khaya in northern Siberia comprising deposits of Late Pleistocene to Early Holocene age has been investigated to characterize living and past microbial communities with respect to modern and paleoclimate environmental conditions and to evaluate the potential of the organic matter (OM) for greenhouse gas generation. Microbial life markersintact phospholipids and phospholipid fatty acidsare found throughout the entire core and indicate the presence of living microorganisms also in older permafrost deposits. Biomarkers for past microbial communities (branched and isoprenoid glycerol dialkyl glycerol tetraether as well as archaeol) reveal links between increased past microbial activity and intervals of high OM accumulation accompanied by increased OM quality presumably caused by local periods of moister and warmer environmental conditions. Concentrations of acetate as an excellent substrate for methanogenesis are used to assess the OM quality with respect to microbial degradability for greenhouse gas production. For this purpose two acetate pools are determined: the pore water acetate and OM bound acetate. Both depth profiles reveal similarities to the OM content and quality indicating a link between the amount of the stored OM and the potential to provide substrates for microbial greenhouse gas production. The data suggest that OM stored in the permafrost deposits is not much different in terms of OM quality than the fresh surface organic material. Considering the expected increase of permafrost thaw due to climate warming, this implies a potentially strong impact on greenhouse gas generation from permafrost areas in future with positive feedback on climate variation.
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