Evidence for preservation of organic carbon interacting with iron in material displaced from retrogressive thaw slumps: Case study in Peel Plateau, western Canadian Arctic
In northern high latitudes, rapid warming is set to amplify carbon-climate feedbacks by enhancing permafrost thaw and biogeochemical transformation of large amounts of soil organic carbon. However, between 30 % and 80 % of permafrost soil organic carbon is considered to be stabilized by geochemical...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/608066 2024-02-11T10:00:55+01:00 Evidence for preservation of organic carbon interacting with iron in material displaced from retrogressive thaw slumps: Case study in Peel Plateau, western Canadian Arctic Thomas, Maxime Monhonval, Arthur Hirst, Catherine Bröder, Lisa Zolkos, Scott Vonk, Jorien E. Tank, Suzanne E. Keskitalo, Kirsi H. Shakil, Sarah Kokelj, Steven V. van der Sluijs, Jurjen Opfergelt, Sophie 2023-05 application/application/pdf https://hdl.handle.net/20.500.11850/608066 https://doi.org/10.3929/ethz-b-000608066 en eng Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geoderma.2023.116443 info:eu-repo/semantics/altIdentifier/wos/000981944500001 http://hdl.handle.net/20.500.11850/608066 doi:10.3929/ethz-b-000608066 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Geoderma, 433 Mineral-organic carbon interactions Retrogressive thaw slumps Mass wasting Peel Plateau Iron info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2023 ftethz https://doi.org/20.500.11850/60806610.3929/ethz-b-00060806610.1016/j.geoderma.2023.116443 2024-01-15T00:51:04Z In northern high latitudes, rapid warming is set to amplify carbon-climate feedbacks by enhancing permafrost thaw and biogeochemical transformation of large amounts of soil organic carbon. However, between 30 % and 80 % of permafrost soil organic carbon is considered to be stabilized by geochemical interactions with the soil mineral pool and thus less susceptible to be emitted as greenhouse gases. Quantification of the nature of and controls on mineral-organic carbon interactions is needed to better constrain permafrost-carbon-climate feedbacks, particularly in ice-rich environments resulting in rapid thaw and development of thermokarst landforms. On sloping terrain, mass wasting features called retrogressive thaw slumps are amongst the most dynamic forms of thermokarst. These multi-decadal disturbances grow due to ablation of an ice-rich headwall, and their enlargement due to warming of the Arctic is mobilizing vast stores of previously frozen materials. Here, we investigate headwall profiles of seven retrogressive thaw slumps and sediments displaced from these mass wasting features from the Peel Plateau, western Canadian Arctic. The disturbances varied in their headwall height (2 to 25 m) and affected land surface area (<1 to > 30 ha). We present total and water extractable mineral element concentrations, mineralogy, and mineral-organic carbon interactions in the headwall layers (active layer, permafrost materials above an early Holocene thaw unconformity, and Pleistocene-aged permafrost tills) and in displaced material (suspended sediments in runoff and material accumulated on the debris tongue). Our data show that the main mechanism of organic carbon stabilization through mineral-organic carbon interactions within the headwall is the complexation with metals (mainly iron), which stabilizes 30 ± 15 % of the total organic carbon pool with higher concentrations in near-surface layers compared to deep permafrost. In the displaced material, this proportion drops to 18 ± 5 %. In addition, we estimate that up ... Article in Journal/Newspaper Arctic Ice permafrost Thermokarst ETH Zürich Research Collection Arctic |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
Mineral-organic carbon interactions Retrogressive thaw slumps Mass wasting Peel Plateau Iron |
spellingShingle |
Mineral-organic carbon interactions Retrogressive thaw slumps Mass wasting Peel Plateau Iron Thomas, Maxime Monhonval, Arthur Hirst, Catherine Bröder, Lisa Zolkos, Scott Vonk, Jorien E. Tank, Suzanne E. Keskitalo, Kirsi H. Shakil, Sarah Kokelj, Steven V. van der Sluijs, Jurjen Opfergelt, Sophie Evidence for preservation of organic carbon interacting with iron in material displaced from retrogressive thaw slumps: Case study in Peel Plateau, western Canadian Arctic |
topic_facet |
Mineral-organic carbon interactions Retrogressive thaw slumps Mass wasting Peel Plateau Iron |
description |
In northern high latitudes, rapid warming is set to amplify carbon-climate feedbacks by enhancing permafrost thaw and biogeochemical transformation of large amounts of soil organic carbon. However, between 30 % and 80 % of permafrost soil organic carbon is considered to be stabilized by geochemical interactions with the soil mineral pool and thus less susceptible to be emitted as greenhouse gases. Quantification of the nature of and controls on mineral-organic carbon interactions is needed to better constrain permafrost-carbon-climate feedbacks, particularly in ice-rich environments resulting in rapid thaw and development of thermokarst landforms. On sloping terrain, mass wasting features called retrogressive thaw slumps are amongst the most dynamic forms of thermokarst. These multi-decadal disturbances grow due to ablation of an ice-rich headwall, and their enlargement due to warming of the Arctic is mobilizing vast stores of previously frozen materials. Here, we investigate headwall profiles of seven retrogressive thaw slumps and sediments displaced from these mass wasting features from the Peel Plateau, western Canadian Arctic. The disturbances varied in their headwall height (2 to 25 m) and affected land surface area (<1 to > 30 ha). We present total and water extractable mineral element concentrations, mineralogy, and mineral-organic carbon interactions in the headwall layers (active layer, permafrost materials above an early Holocene thaw unconformity, and Pleistocene-aged permafrost tills) and in displaced material (suspended sediments in runoff and material accumulated on the debris tongue). Our data show that the main mechanism of organic carbon stabilization through mineral-organic carbon interactions within the headwall is the complexation with metals (mainly iron), which stabilizes 30 ± 15 % of the total organic carbon pool with higher concentrations in near-surface layers compared to deep permafrost. In the displaced material, this proportion drops to 18 ± 5 %. In addition, we estimate that up ... |
format |
Article in Journal/Newspaper |
author |
Thomas, Maxime Monhonval, Arthur Hirst, Catherine Bröder, Lisa Zolkos, Scott Vonk, Jorien E. Tank, Suzanne E. Keskitalo, Kirsi H. Shakil, Sarah Kokelj, Steven V. van der Sluijs, Jurjen Opfergelt, Sophie |
author_facet |
Thomas, Maxime Monhonval, Arthur Hirst, Catherine Bröder, Lisa Zolkos, Scott Vonk, Jorien E. Tank, Suzanne E. Keskitalo, Kirsi H. Shakil, Sarah Kokelj, Steven V. van der Sluijs, Jurjen Opfergelt, Sophie |
author_sort |
Thomas, Maxime |
title |
Evidence for preservation of organic carbon interacting with iron in material displaced from retrogressive thaw slumps: Case study in Peel Plateau, western Canadian Arctic |
title_short |
Evidence for preservation of organic carbon interacting with iron in material displaced from retrogressive thaw slumps: Case study in Peel Plateau, western Canadian Arctic |
title_full |
Evidence for preservation of organic carbon interacting with iron in material displaced from retrogressive thaw slumps: Case study in Peel Plateau, western Canadian Arctic |
title_fullStr |
Evidence for preservation of organic carbon interacting with iron in material displaced from retrogressive thaw slumps: Case study in Peel Plateau, western Canadian Arctic |
title_full_unstemmed |
Evidence for preservation of organic carbon interacting with iron in material displaced from retrogressive thaw slumps: Case study in Peel Plateau, western Canadian Arctic |
title_sort |
evidence for preservation of organic carbon interacting with iron in material displaced from retrogressive thaw slumps: case study in peel plateau, western canadian arctic |
publisher |
Elsevier |
publishDate |
2023 |
url |
https://hdl.handle.net/20.500.11850/608066 https://doi.org/10.3929/ethz-b-000608066 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Ice permafrost Thermokarst |
genre_facet |
Arctic Ice permafrost Thermokarst |
op_source |
Geoderma, 433 |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.geoderma.2023.116443 info:eu-repo/semantics/altIdentifier/wos/000981944500001 http://hdl.handle.net/20.500.11850/608066 doi:10.3929/ethz-b-000608066 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by-nc-nd/4.0/ Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International |
op_doi |
https://doi.org/20.500.11850/60806610.3929/ethz-b-00060806610.1016/j.geoderma.2023.116443 |
_version_ |
1790596642127216640 |