Low biodegradability of particulate organic carbon mobilized from thaw slumps on the Peel Plateau, NT, and possible chemosynthesis and sorption effects
Warming and wetting in the western Canadian Arctic are accelerating thaw-driven mass wasting by permafrost thaw slumps, increasing total organic carbon (TOC) delivery to headwater streams by orders of magnitude primarily due to increases in particulate organic carbon (POC). Upon thaw, permafrost car...
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Copernicus Publications
2022
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00060523 2023-05-15T15:07:23+02:00 Low biodegradability of particulate organic carbon mobilized from thaw slumps on the Peel Plateau, NT, and possible chemosynthesis and sorption effects Shakil, Sarah Tank, Suzanne E. Vonk, Jorien E. Zolkos, Scott 2022-04 electronic https://doi.org/10.5194/bg-19-1871-2022 https://noa.gwlb.de/receive/cop_mods_00060523 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060148/bg-19-1871-2022.pdf https://bg.copernicus.org/articles/19/1871/2022/bg-19-1871-2022.pdf eng eng Copernicus Publications Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-19-1871-2022 https://noa.gwlb.de/receive/cop_mods_00060523 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060148/bg-19-1871-2022.pdf https://bg.copernicus.org/articles/19/1871/2022/bg-19-1871-2022.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess CC-BY article Verlagsveröffentlichung article Text doc-type:article 2022 ftnonlinearchiv https://doi.org/10.5194/bg-19-1871-2022 2022-04-10T23:09:32Z Warming and wetting in the western Canadian Arctic are accelerating thaw-driven mass wasting by permafrost thaw slumps, increasing total organic carbon (TOC) delivery to headwater streams by orders of magnitude primarily due to increases in particulate organic carbon (POC). Upon thaw, permafrost carbon entering and transported within streams may be mineralized to CO2 or re-sequestered into sediments. The balance between these processes is an important uncertainty in the permafrost–carbon–climate feedback. Using aerobic incubations of TOC from streams affected by thaw slumps we find that slump-derived organic carbon undergoes minimal (∼ 4 %) oxidation over a 1-month period, indicating that this material may be predominantly destined for sediment deposition. Simultaneous measurements of POC and dissolved organic carbon (DOC) suggest that mineralization of DOC accounted for most of the TOC loss. Our results indicate that mobilization of mineral-rich tills in this region may protect carbon from mineralization via adsorption to minerals and promote inorganic carbon sequestration via chemolithoautotrophic processes. With intensification of hillslope mass wasting across the northern permafrost zone, region-specific assessments of permafrost carbon fates and inquiries beyond organic carbon decomposition are needed to constrain drivers of carbon cycling and climate feedbacks within stream networks affected by permafrost thaw. Article in Journal/Newspaper Arctic permafrost Niedersächsisches Online-Archiv NOA Arctic Biogeosciences 19 7 1871 1890 |
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Niedersächsisches Online-Archiv NOA |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Shakil, Sarah Tank, Suzanne E. Vonk, Jorien E. Zolkos, Scott Low biodegradability of particulate organic carbon mobilized from thaw slumps on the Peel Plateau, NT, and possible chemosynthesis and sorption effects |
topic_facet |
article Verlagsveröffentlichung |
description |
Warming and wetting in the western Canadian Arctic are accelerating thaw-driven mass wasting by permafrost thaw slumps, increasing total organic carbon (TOC) delivery to headwater streams by orders of magnitude primarily due to increases in particulate organic carbon (POC). Upon thaw, permafrost carbon entering and transported within streams may be mineralized to CO2 or re-sequestered into sediments. The balance between these processes is an important uncertainty in the permafrost–carbon–climate feedback. Using aerobic incubations of TOC from streams affected by thaw slumps we find that slump-derived organic carbon undergoes minimal (∼ 4 %) oxidation over a 1-month period, indicating that this material may be predominantly destined for sediment deposition. Simultaneous measurements of POC and dissolved organic carbon (DOC) suggest that mineralization of DOC accounted for most of the TOC loss. Our results indicate that mobilization of mineral-rich tills in this region may protect carbon from mineralization via adsorption to minerals and promote inorganic carbon sequestration via chemolithoautotrophic processes. With intensification of hillslope mass wasting across the northern permafrost zone, region-specific assessments of permafrost carbon fates and inquiries beyond organic carbon decomposition are needed to constrain drivers of carbon cycling and climate feedbacks within stream networks affected by permafrost thaw. |
format |
Article in Journal/Newspaper |
author |
Shakil, Sarah Tank, Suzanne E. Vonk, Jorien E. Zolkos, Scott |
author_facet |
Shakil, Sarah Tank, Suzanne E. Vonk, Jorien E. Zolkos, Scott |
author_sort |
Shakil, Sarah |
title |
Low biodegradability of particulate organic carbon mobilized from thaw slumps on the Peel Plateau, NT, and possible chemosynthesis and sorption effects |
title_short |
Low biodegradability of particulate organic carbon mobilized from thaw slumps on the Peel Plateau, NT, and possible chemosynthesis and sorption effects |
title_full |
Low biodegradability of particulate organic carbon mobilized from thaw slumps on the Peel Plateau, NT, and possible chemosynthesis and sorption effects |
title_fullStr |
Low biodegradability of particulate organic carbon mobilized from thaw slumps on the Peel Plateau, NT, and possible chemosynthesis and sorption effects |
title_full_unstemmed |
Low biodegradability of particulate organic carbon mobilized from thaw slumps on the Peel Plateau, NT, and possible chemosynthesis and sorption effects |
title_sort |
low biodegradability of particulate organic carbon mobilized from thaw slumps on the peel plateau, nt, and possible chemosynthesis and sorption effects |
publisher |
Copernicus Publications |
publishDate |
2022 |
url |
https://doi.org/10.5194/bg-19-1871-2022 https://noa.gwlb.de/receive/cop_mods_00060523 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060148/bg-19-1871-2022.pdf https://bg.copernicus.org/articles/19/1871/2022/bg-19-1871-2022.pdf |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost |
genre_facet |
Arctic permafrost |
op_relation |
Biogeosciences -- http://www.bibliothek.uni-regensburg.de/ezeit/?2158181 -- http://www.copernicus.org/EGU/bg/bg.html -- 1726-4189 https://doi.org/10.5194/bg-19-1871-2022 https://noa.gwlb.de/receive/cop_mods_00060523 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00060148/bg-19-1871-2022.pdf https://bg.copernicus.org/articles/19/1871/2022/bg-19-1871-2022.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.5194/bg-19-1871-2022 |
container_title |
Biogeosciences |
container_volume |
19 |
container_issue |
7 |
container_start_page |
1871 |
op_container_end_page |
1890 |
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1766338905809879040 |