Organic matter characteristics in yedoma and taberal deposits in Siberia


Contact
loeka.jongejans [ at ] awi.de

Abstract

With ongoing climate change, the Arctic will continue to warm approximately twice as fast as the lower latitudes. As large parts of the Arctic are affected by permafrost, large-scale degradation processes such as thermokarst and thermal erosion, will accelerate. As a legacy of the last ice-age, ice-rich permafrost, such as yedoma permafrost, covers large areas in Alaska and Siberia. These deposits can reach a thickness up to 50 m and are prone to deep degradation, due to a ground ice content up to 90 vol%. Moreover, undisturbed yedoma deposits contain organic carbon (OC) of high quality which is presumably highly vulnerable to future microbial decomposition. Climate warming of these deposits can mobilize OC even well below 1 m soil depth. In the proposed dissertation project, I aim to assess the vulnerability of ice-rich permafrost landscapes to future permafrost thaw, and the quality and size of the OC pool. Both tasks are crucial to assess future greenhouse gas release rates. Therefore, I will combine Arctic field, state-of-the-art laboratory analysis and statistical analysis on samples from this highly vulnerable part of the earth. The project is crucial in the understanding of OC characteristics in ice-rich permafrost, which is the basis for reliable Arctic climate predictions by illuminating biogeochemical processes influencing greenhouse gas release from vast regions in the warming terrestrial Arctic.



Item Type
Conference (Poster)
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Primary Division
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Peer revision
Not peer-reviewed
Publication Status
Published
Event Details
AK Permafrost, 01 Dec 2018 - 02 Dec 2018, Bremerhaven, Germany.
Eprint ID
48673
Cite as
Jongejans, L. , Strauss, J. , Mangelsdorf, K. , Lenz, J. and Grosse, G. (2018): Organic matter characteristics in yedoma and taberal deposits in Siberia , AK Permafrost, Bremerhaven, Germany, 1 December 2018 - 2 December 2018 .


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