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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Elsevier BV
2023
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Online Access: | http://hdl.handle.net/2078.1/274102 https://doi.org/10.1016/j.geoderma.2023.116443 |
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ftunivlouvain:oai:dial.uclouvain.be:boreal:274102 2024-05-19T07:35:36+00:00 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 UCL - SST/ELI/ELIE - Environmental Sciences 2023 http://hdl.handle.net/2078.1/274102 https://doi.org/10.1016/j.geoderma.2023.116443 eng eng Elsevier BV info:eu-repo/grantAgreement/European Research Council (ERC)/European Union’s Horizon 2020 research and innovation program/WeThaw info:eu-repo/grantAgreement/European Research Council (ERC)/European Union’s Horizon 2020 research and innovation program/Thawsome info:eu-repo/grantAgreement/FNRS//FC69480 info:eu-repo/grantAgreement/Natural Sciences and Engineering Research Council of Canada//430696 info:eu-repo/grantAgreement/Natural Sciences and Engineering Research Council of Canada//444873 info:eu-repo/grantAgreement/Polar Continental Shelf Program//617- 17 boreal:274102 http://hdl.handle.net/2078.1/274102 doi:10.1016/j.geoderma.2023.116443 urn:ISSN:0016-7061 info:eu-repo/semantics/openAccess Geoderma, Vol. 433, no. 116443 (2023) Mineral-organic carbon interactions Retrogressive thaw slumps Mass wasting Peel Plateau Iron info:eu-repo/semantics/article 2023 ftunivlouvain https://doi.org/10.1016/j.geoderma.2023.116443 2024-04-30T23:32:17Z 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 ... Article in Journal/Newspaper Arctic Ice permafrost Thermokarst DIAL@UCLouvain (Université catholique de Louvain) Geoderma 433 116443 |
institution |
Open Polar |
collection |
DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
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 ... |
author2 |
UCL - SST/ELI/ELIE - Environmental Sciences |
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 BV |
publishDate |
2023 |
url |
http://hdl.handle.net/2078.1/274102 https://doi.org/10.1016/j.geoderma.2023.116443 |
genre |
Arctic Ice permafrost Thermokarst |
genre_facet |
Arctic Ice permafrost Thermokarst |
op_source |
Geoderma, Vol. 433, no. 116443 (2023) |
op_relation |
info:eu-repo/grantAgreement/European Research Council (ERC)/European Union’s Horizon 2020 research and innovation program/WeThaw info:eu-repo/grantAgreement/European Research Council (ERC)/European Union’s Horizon 2020 research and innovation program/Thawsome info:eu-repo/grantAgreement/FNRS//FC69480 info:eu-repo/grantAgreement/Natural Sciences and Engineering Research Council of Canada//430696 info:eu-repo/grantAgreement/Natural Sciences and Engineering Research Council of Canada//444873 info:eu-repo/grantAgreement/Polar Continental Shelf Program//617- 17 boreal:274102 http://hdl.handle.net/2078.1/274102 doi:10.1016/j.geoderma.2023.116443 urn:ISSN:0016-7061 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.geoderma.2023.116443 |
container_title |
Geoderma |
container_volume |
433 |
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116443 |
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1799474377177169920 |