Characterisation of three regimes of collapsing Arctic ice complex deposits on the SE Laptev Sea coast using biomarkers and dual carbon isotopes
Arctic amplification of climate warming is intensifying the thaw and coastal erosion of the widespread and carbon-rich Siberian Ice Complex Deposits (ICD). Despite the potential for altering long-term carbon dynamics in the Arctic, the susceptibility of organic carbon (OC) to degradation as the ICD...
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ftunivutrecht:oai:dspace.library.uu.nl:1874/302874 2023-07-23T04:17:26+02:00 Characterisation of three regimes of collapsing Arctic ice complex deposits on the SE Laptev Sea coast using biomarkers and dual carbon isotopes Sanchez-Garcia, Laura Vonk, Jorien Charkin, Alexander Kosmach, Denis Dudarev, Oleg Semiletov, Igor Gustafsson, Örjan Organic geochemistry NWO-VENI: Ancient organic matter that matters: The fate of Siberian Yedoma deposits 2014 application/pdf https://dspace.library.uu.nl/handle/1874/302874 en eng 1045-6740 https://dspace.library.uu.nl/handle/1874/302874 info:eu-repo/semantics/EmbargoedAccess Ice Complex Deposits thermal degradation isotopic-molecular markers Article 2014 ftunivutrecht 2023-07-02T01:06:34Z Arctic amplification of climate warming is intensifying the thaw and coastal erosion of the widespread and carbon-rich Siberian Ice Complex Deposits (ICD). Despite the potential for altering long-term carbon dynamics in the Arctic, the susceptibility of organic carbon (OC) to degradation as the ICD thaw is poorly characterised. This study identifies signs of OC degradation in three Siberian ICD regimes of coastal erosion through elemental, isotopic and molecular analyses. The degree of erosion appears to determine the extent of degradation. The moisture-limited and beach-protected ICD bluff near Buor-Khaya Cape, characterised by thermokarst mounds (baydzherakhs), represents a dormant regime with limited ongoing degradation. Conversely, the more exposed ICD scarps on eroding riverbanks (Olenek Channel, Lena Delta) and coastal slopes (Muostakh Island) showed more pronounced signs of ongoing OC decay. Different parameters suggest that degradation can partially explain the shift of the OC signature with 14C age in the thawing ICD. Exposure time, degree of erosion, slope gradient and moisture conditions appear to be key factors determining the degradation propensity of OC in exposed ICD. These field results document the lability of OC in ICD upon thaw and illustrate the potential for transferring old OC into the rapidly cycling atmosphere-biosphere carbon pools. Article in Journal/Newspaper Arctic laptev Laptev Sea lena delta Thermokarst Utrecht University Repository Arctic Buor-Khaya ENVELOPE(127.803,127.803,72.287,72.287) Khaya ENVELOPE(135.167,135.167,60.567,60.567) Laptev Sea |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Ice Complex Deposits thermal degradation isotopic-molecular markers |
spellingShingle |
Ice Complex Deposits thermal degradation isotopic-molecular markers Sanchez-Garcia, Laura Vonk, Jorien Charkin, Alexander Kosmach, Denis Dudarev, Oleg Semiletov, Igor Gustafsson, Örjan Characterisation of three regimes of collapsing Arctic ice complex deposits on the SE Laptev Sea coast using biomarkers and dual carbon isotopes |
topic_facet |
Ice Complex Deposits thermal degradation isotopic-molecular markers |
description |
Arctic amplification of climate warming is intensifying the thaw and coastal erosion of the widespread and carbon-rich Siberian Ice Complex Deposits (ICD). Despite the potential for altering long-term carbon dynamics in the Arctic, the susceptibility of organic carbon (OC) to degradation as the ICD thaw is poorly characterised. This study identifies signs of OC degradation in three Siberian ICD regimes of coastal erosion through elemental, isotopic and molecular analyses. The degree of erosion appears to determine the extent of degradation. The moisture-limited and beach-protected ICD bluff near Buor-Khaya Cape, characterised by thermokarst mounds (baydzherakhs), represents a dormant regime with limited ongoing degradation. Conversely, the more exposed ICD scarps on eroding riverbanks (Olenek Channel, Lena Delta) and coastal slopes (Muostakh Island) showed more pronounced signs of ongoing OC decay. Different parameters suggest that degradation can partially explain the shift of the OC signature with 14C age in the thawing ICD. Exposure time, degree of erosion, slope gradient and moisture conditions appear to be key factors determining the degradation propensity of OC in exposed ICD. These field results document the lability of OC in ICD upon thaw and illustrate the potential for transferring old OC into the rapidly cycling atmosphere-biosphere carbon pools. |
author2 |
Organic geochemistry NWO-VENI: Ancient organic matter that matters: The fate of Siberian Yedoma deposits |
format |
Article in Journal/Newspaper |
author |
Sanchez-Garcia, Laura Vonk, Jorien Charkin, Alexander Kosmach, Denis Dudarev, Oleg Semiletov, Igor Gustafsson, Örjan |
author_facet |
Sanchez-Garcia, Laura Vonk, Jorien Charkin, Alexander Kosmach, Denis Dudarev, Oleg Semiletov, Igor Gustafsson, Örjan |
author_sort |
Sanchez-Garcia, Laura |
title |
Characterisation of three regimes of collapsing Arctic ice complex deposits on the SE Laptev Sea coast using biomarkers and dual carbon isotopes |
title_short |
Characterisation of three regimes of collapsing Arctic ice complex deposits on the SE Laptev Sea coast using biomarkers and dual carbon isotopes |
title_full |
Characterisation of three regimes of collapsing Arctic ice complex deposits on the SE Laptev Sea coast using biomarkers and dual carbon isotopes |
title_fullStr |
Characterisation of three regimes of collapsing Arctic ice complex deposits on the SE Laptev Sea coast using biomarkers and dual carbon isotopes |
title_full_unstemmed |
Characterisation of three regimes of collapsing Arctic ice complex deposits on the SE Laptev Sea coast using biomarkers and dual carbon isotopes |
title_sort |
characterisation of three regimes of collapsing arctic ice complex deposits on the se laptev sea coast using biomarkers and dual carbon isotopes |
publishDate |
2014 |
url |
https://dspace.library.uu.nl/handle/1874/302874 |
long_lat |
ENVELOPE(127.803,127.803,72.287,72.287) ENVELOPE(135.167,135.167,60.567,60.567) |
geographic |
Arctic Buor-Khaya Khaya Laptev Sea |
geographic_facet |
Arctic Buor-Khaya Khaya Laptev Sea |
genre |
Arctic laptev Laptev Sea lena delta Thermokarst |
genre_facet |
Arctic laptev Laptev Sea lena delta Thermokarst |
op_relation |
1045-6740 https://dspace.library.uu.nl/handle/1874/302874 |
op_rights |
info:eu-repo/semantics/EmbargoedAccess |
_version_ |
1772179185865850880 |