Organic matter stored in ice-rich permafrost: Future permafrost thaw and greenhouse gas release
The Arctic is changing rapidly and permafrost is thawing. Especially ice-rich permafrost, such as the late Pleistocene Yedoma, is vulnerable to rapid and deep thaw processes such as surface subsidence after the melting of ground ice. Due to permafrost thaw, the permafrost carbon pool is becoming inc...
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ftawi:oai:epic.awi.de:57560 2023-05-15T15:15:07+02:00 Organic matter stored in ice-rich permafrost: Future permafrost thaw and greenhouse gas release Jongejans, Loeka Laura Strauß, Jens Grosse, Guido 2022-08-24 application/pdf https://epic.awi.de/id/eprint/57560/ https://epic.awi.de/id/eprint/57560/1/jongejans_diss.pdf https://hdl.handle.net/10013/epic.7b8b4de5-10a2-49c3-a13b-0a30edfd16f6 https://hdl.handle.net/ unknown https://epic.awi.de/id/eprint/57560/1/jongejans_diss.pdf https://hdl.handle.net/ Jongejans, L. L. (2022) Organic matter stored in ice-rich permafrost: Future permafrost thaw and greenhouse gas release / J. Strauß orcid:0000-0003-4678-4982 and G. Grosse (editors) PhD thesis, doi:10.25932/publishup-56491 <https://doi.org/10.25932/publishup-56491> , hdl:10013/epic.7b8b4de5-10a2-49c3-a13b-0a30edfd16f6 EPIC3 Thesis notRev 2022 ftawi https://doi.org/10.25932/publishup-56491 2022-12-05T00:12:57Z The Arctic is changing rapidly and permafrost is thawing. Especially ice-rich permafrost, such as the late Pleistocene Yedoma, is vulnerable to rapid and deep thaw processes such as surface subsidence after the melting of ground ice. Due to permafrost thaw, the permafrost carbon pool is becoming increasingly accessible to microbes, leading to increased greenhouse gas emissions, which enhances the climate warming. The assessment of the molecular structure and biodegradability of permafrost organic matter (OM) is highly needed. My research revolves around the question “how does permafrost thaw affect its OM storage?” More specifically, I assessed (1) how molecular biomarkers can be applied to characterize permafrost OM, (2) greenhouse gas production rates from thawing permafrost, and (3) the quality of OM of frozen and (previously) thawed sediments. I studied deep (max. 55 m) Yedoma and thawed Yedoma permafrost sediments from Yakutia (Sakha Republic). I analyzed sediment cores taken below thermokarst lakes on the Bykovsky Peninsula (southeast of the Lena Delta) and in the Yukechi Alas (Central Yakutia), and headwall samples from the permafrost cliff Sobo-Sise (Lena Delta) and the retrogressive thaw slump Batagay (Yana Uplands). I measured biomarker concentrations of all sediment samples. Furthermore, I carried out incubation experiments to quantify greenhouse gas production in thawing permafrost. I showed that the biomarker proxies are useful to assess the source of the OM and to distinguish between OM derived from terrestrial higher plants, aquatic plants and microbial activity. In addition, I showed that some proxies help to assess the degree of degradation of permafrost OM, especially when combined with sedimentological data in a multi-proxy approach. The OM of Yedoma is generally better preserved than that of thawed Yedoma sediments. The greenhouse gas production was highest in the permafrost sediments that thawed for the first time, meaning that the frozen Yedoma sediments contained most labile OM. ... Thesis Arctic Ice lena delta permafrost Sakha Republic Thermokarst Yakutia Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Sakha |
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Open Polar |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
The Arctic is changing rapidly and permafrost is thawing. Especially ice-rich permafrost, such as the late Pleistocene Yedoma, is vulnerable to rapid and deep thaw processes such as surface subsidence after the melting of ground ice. Due to permafrost thaw, the permafrost carbon pool is becoming increasingly accessible to microbes, leading to increased greenhouse gas emissions, which enhances the climate warming. The assessment of the molecular structure and biodegradability of permafrost organic matter (OM) is highly needed. My research revolves around the question “how does permafrost thaw affect its OM storage?” More specifically, I assessed (1) how molecular biomarkers can be applied to characterize permafrost OM, (2) greenhouse gas production rates from thawing permafrost, and (3) the quality of OM of frozen and (previously) thawed sediments. I studied deep (max. 55 m) Yedoma and thawed Yedoma permafrost sediments from Yakutia (Sakha Republic). I analyzed sediment cores taken below thermokarst lakes on the Bykovsky Peninsula (southeast of the Lena Delta) and in the Yukechi Alas (Central Yakutia), and headwall samples from the permafrost cliff Sobo-Sise (Lena Delta) and the retrogressive thaw slump Batagay (Yana Uplands). I measured biomarker concentrations of all sediment samples. Furthermore, I carried out incubation experiments to quantify greenhouse gas production in thawing permafrost. I showed that the biomarker proxies are useful to assess the source of the OM and to distinguish between OM derived from terrestrial higher plants, aquatic plants and microbial activity. In addition, I showed that some proxies help to assess the degree of degradation of permafrost OM, especially when combined with sedimentological data in a multi-proxy approach. The OM of Yedoma is generally better preserved than that of thawed Yedoma sediments. The greenhouse gas production was highest in the permafrost sediments that thawed for the first time, meaning that the frozen Yedoma sediments contained most labile OM. ... |
author2 |
Strauß, Jens Grosse, Guido |
format |
Thesis |
author |
Jongejans, Loeka Laura |
spellingShingle |
Jongejans, Loeka Laura Organic matter stored in ice-rich permafrost: Future permafrost thaw and greenhouse gas release |
author_facet |
Jongejans, Loeka Laura |
author_sort |
Jongejans, Loeka Laura |
title |
Organic matter stored in ice-rich permafrost: Future permafrost thaw and greenhouse gas release |
title_short |
Organic matter stored in ice-rich permafrost: Future permafrost thaw and greenhouse gas release |
title_full |
Organic matter stored in ice-rich permafrost: Future permafrost thaw and greenhouse gas release |
title_fullStr |
Organic matter stored in ice-rich permafrost: Future permafrost thaw and greenhouse gas release |
title_full_unstemmed |
Organic matter stored in ice-rich permafrost: Future permafrost thaw and greenhouse gas release |
title_sort |
organic matter stored in ice-rich permafrost: future permafrost thaw and greenhouse gas release |
publishDate |
2022 |
url |
https://epic.awi.de/id/eprint/57560/ https://epic.awi.de/id/eprint/57560/1/jongejans_diss.pdf https://hdl.handle.net/10013/epic.7b8b4de5-10a2-49c3-a13b-0a30edfd16f6 https://hdl.handle.net/ |
geographic |
Arctic Sakha |
geographic_facet |
Arctic Sakha |
genre |
Arctic Ice lena delta permafrost Sakha Republic Thermokarst Yakutia |
genre_facet |
Arctic Ice lena delta permafrost Sakha Republic Thermokarst Yakutia |
op_source |
EPIC3 |
op_relation |
https://epic.awi.de/id/eprint/57560/1/jongejans_diss.pdf https://hdl.handle.net/ Jongejans, L. L. (2022) Organic matter stored in ice-rich permafrost: Future permafrost thaw and greenhouse gas release / J. Strauß orcid:0000-0003-4678-4982 and G. Grosse (editors) PhD thesis, doi:10.25932/publishup-56491 <https://doi.org/10.25932/publishup-56491> , hdl:10013/epic.7b8b4de5-10a2-49c3-a13b-0a30edfd16f6 |
op_doi |
https://doi.org/10.25932/publishup-56491 |
_version_ |
1766345493222260736 |