Organic matter characteristics of a rapidly eroding permafrost cliff in NE Siberia (Lena Delta, Laptev Sea region)
Organic carbon (OC) stored in Arctic permafrost represents one of Earth's largest and most vulnerable terrestrial carbon pools. Amplified climate warming across the Arctic results in widespread permafrost thaw. Permafrost deposits exposed at river cliffs and coasts are particularly susceptible...
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Copernicus Publications
2022
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ftdoajarticles:oai:doaj.org/article:574a2a4eb5dd46c5b4036b653fae373e 2023-05-15T15:03:45+02:00 Organic matter characteristics of a rapidly eroding permafrost cliff in NE Siberia (Lena Delta, Laptev Sea region) C. Haugk L. L. Jongejans K. Mangelsdorf M. Fuchs O. Ogneva J. Palmtag G. Mollenhauer P. J. Mann P. P. Overduin G. Grosse T. Sanders R. E. Tuerena L. Schirrmeister S. Wetterich A. Kizyakov C. Karger J. Strauss 2022-04-01T00:00:00Z https://doi.org/10.5194/bg-19-2079-2022 https://doaj.org/article/574a2a4eb5dd46c5b4036b653fae373e EN eng Copernicus Publications https://bg.copernicus.org/articles/19/2079/2022/bg-19-2079-2022.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-19-2079-2022 1726-4170 1726-4189 https://doaj.org/article/574a2a4eb5dd46c5b4036b653fae373e Biogeosciences, Vol 19, Pp 2079-2094 (2022) Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 article 2022 ftdoajarticles https://doi.org/10.5194/bg-19-2079-2022 2022-12-30T22:59:54Z Organic carbon (OC) stored in Arctic permafrost represents one of Earth's largest and most vulnerable terrestrial carbon pools. Amplified climate warming across the Arctic results in widespread permafrost thaw. Permafrost deposits exposed at river cliffs and coasts are particularly susceptible to thawing processes. Accelerating erosion of terrestrial permafrost along shorelines leads to increased transfer of organic matter (OM) to nearshore waters. However, the amount of terrestrial permafrost carbon and nitrogen as well as the OM quality in these deposits is still poorly quantified. We define the OM quality as the intrinsic potential for further transformation, decomposition and mineralisation. Here, we characterise the sources and the quality of OM supplied to the Lena River at a rapidly eroding permafrost river shoreline cliff in the eastern part of the delta (Sobo-Sise Island). Our multi-proxy approach captures bulk elemental, molecular geochemical and carbon isotopic analyses of Late Pleistocene Yedoma permafrost and Holocene cover deposits, discontinuously spanning the last ∼52 kyr. We showed that the ancient permafrost exposed in the Sobo-Sise cliff has a high organic carbon content (mean of about 5 wt %). The oldest sediments stem from Marine Isotope Stage (MIS) 3 interstadial deposits (dated to 52 to 28 cal ka BP) and are overlaid by last glacial MIS 2 (dated to 28 to 15 cal ka BP) and Holocene MIS 1 (dated to 7–0 cal ka BP) deposits. The relatively high average chain length (ACL) index of n -alkanes along the cliff profile indicates a predominant contribution of vascular plants to the OM composition. The elevated ratio of iso- and anteiso-branched fatty acids (FAs) relative to mid- and long-chain (C ≥ 20) n -FAs in the interstadial MIS 3 and the interglacial MIS 1 deposits suggests stronger microbial activity and consequently higher input of bacterial biomass during these climatically warmer periods. The overall high carbon preference index (CPI) and higher plant fatty acid (HPFA) values as well as ... Article in Journal/Newspaper Arctic laptev Laptev Sea lena delta lena river permafrost Siberia Directory of Open Access Journals: DOAJ Articles Arctic Laptev Sea Biogeosciences 19 7 2079 2094 |
institution |
Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
spellingShingle |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 C. Haugk L. L. Jongejans K. Mangelsdorf M. Fuchs O. Ogneva J. Palmtag G. Mollenhauer P. J. Mann P. P. Overduin G. Grosse T. Sanders R. E. Tuerena L. Schirrmeister S. Wetterich A. Kizyakov C. Karger J. Strauss Organic matter characteristics of a rapidly eroding permafrost cliff in NE Siberia (Lena Delta, Laptev Sea region) |
topic_facet |
Ecology QH540-549.5 Life QH501-531 Geology QE1-996.5 |
description |
Organic carbon (OC) stored in Arctic permafrost represents one of Earth's largest and most vulnerable terrestrial carbon pools. Amplified climate warming across the Arctic results in widespread permafrost thaw. Permafrost deposits exposed at river cliffs and coasts are particularly susceptible to thawing processes. Accelerating erosion of terrestrial permafrost along shorelines leads to increased transfer of organic matter (OM) to nearshore waters. However, the amount of terrestrial permafrost carbon and nitrogen as well as the OM quality in these deposits is still poorly quantified. We define the OM quality as the intrinsic potential for further transformation, decomposition and mineralisation. Here, we characterise the sources and the quality of OM supplied to the Lena River at a rapidly eroding permafrost river shoreline cliff in the eastern part of the delta (Sobo-Sise Island). Our multi-proxy approach captures bulk elemental, molecular geochemical and carbon isotopic analyses of Late Pleistocene Yedoma permafrost and Holocene cover deposits, discontinuously spanning the last ∼52 kyr. We showed that the ancient permafrost exposed in the Sobo-Sise cliff has a high organic carbon content (mean of about 5 wt %). The oldest sediments stem from Marine Isotope Stage (MIS) 3 interstadial deposits (dated to 52 to 28 cal ka BP) and are overlaid by last glacial MIS 2 (dated to 28 to 15 cal ka BP) and Holocene MIS 1 (dated to 7–0 cal ka BP) deposits. The relatively high average chain length (ACL) index of n -alkanes along the cliff profile indicates a predominant contribution of vascular plants to the OM composition. The elevated ratio of iso- and anteiso-branched fatty acids (FAs) relative to mid- and long-chain (C ≥ 20) n -FAs in the interstadial MIS 3 and the interglacial MIS 1 deposits suggests stronger microbial activity and consequently higher input of bacterial biomass during these climatically warmer periods. The overall high carbon preference index (CPI) and higher plant fatty acid (HPFA) values as well as ... |
format |
Article in Journal/Newspaper |
author |
C. Haugk L. L. Jongejans K. Mangelsdorf M. Fuchs O. Ogneva J. Palmtag G. Mollenhauer P. J. Mann P. P. Overduin G. Grosse T. Sanders R. E. Tuerena L. Schirrmeister S. Wetterich A. Kizyakov C. Karger J. Strauss |
author_facet |
C. Haugk L. L. Jongejans K. Mangelsdorf M. Fuchs O. Ogneva J. Palmtag G. Mollenhauer P. J. Mann P. P. Overduin G. Grosse T. Sanders R. E. Tuerena L. Schirrmeister S. Wetterich A. Kizyakov C. Karger J. Strauss |
author_sort |
C. Haugk |
title |
Organic matter characteristics of a rapidly eroding permafrost cliff in NE Siberia (Lena Delta, Laptev Sea region) |
title_short |
Organic matter characteristics of a rapidly eroding permafrost cliff in NE Siberia (Lena Delta, Laptev Sea region) |
title_full |
Organic matter characteristics of a rapidly eroding permafrost cliff in NE Siberia (Lena Delta, Laptev Sea region) |
title_fullStr |
Organic matter characteristics of a rapidly eroding permafrost cliff in NE Siberia (Lena Delta, Laptev Sea region) |
title_full_unstemmed |
Organic matter characteristics of a rapidly eroding permafrost cliff in NE Siberia (Lena Delta, Laptev Sea region) |
title_sort |
organic matter characteristics of a rapidly eroding permafrost cliff in ne siberia (lena delta, laptev sea region) |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/bg-19-2079-2022 https://doaj.org/article/574a2a4eb5dd46c5b4036b653fae373e |
geographic |
Arctic Laptev Sea |
geographic_facet |
Arctic Laptev Sea |
genre |
Arctic laptev Laptev Sea lena delta lena river permafrost Siberia |
genre_facet |
Arctic laptev Laptev Sea lena delta lena river permafrost Siberia |
op_source |
Biogeosciences, Vol 19, Pp 2079-2094 (2022) |
op_relation |
https://bg.copernicus.org/articles/19/2079/2022/bg-19-2079-2022.pdf https://doaj.org/toc/1726-4170 https://doaj.org/toc/1726-4189 doi:10.5194/bg-19-2079-2022 1726-4170 1726-4189 https://doaj.org/article/574a2a4eb5dd46c5b4036b653fae373e |
op_doi |
https://doi.org/10.5194/bg-19-2079-2022 |
container_title |
Biogeosciences |
container_volume |
19 |
container_issue |
7 |
container_start_page |
2079 |
op_container_end_page |
2094 |
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1766335598788870144 |