Biogeochemistry of low- and high-centered ice-wedge polygons in wetlands in Svalbard
Arctic wetlands are a globally significant store of soil organic carbon. They are often characterized by ice-wedge polygons, which are diagnostic of lowland permafrost, and which greatly influence wetland hydrology and biogeochemistry during summer. The degradation of ice-wedge polygons, which can o...
Published in: | Permafrost and Periglacial Processes |
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Online Access: | https://hdl.handle.net/11250/3071940 https://doi.org/10.1002/ppp.2192 |
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fthsvestlandet:oai:hvlopen.brage.unit.no:11250/3071940 2024-03-03T08:36:14+00:00 Biogeochemistry of low- and high-centered ice-wedge polygons in wetlands in Svalbard Jones, Eleanor L. Hodson, Andrew Redeker, Kelly Robert Christiansen, Hanne H. Thornton, Steve F. Rogers, Jade 2023 application/pdf https://hdl.handle.net/11250/3071940 https://doi.org/10.1002/ppp.2192 eng eng Wiley EU/JPI Topic 2 (Project 71126) Norges forskningsråd: 244906 Norges forskningsråd: 294764 urn:issn:1045-6740 https://hdl.handle.net/11250/3071940 https://doi.org/10.1002/ppp.2192 cristin:2146470 Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2023 The Authors Permafrost and Periglacial Processes Peer reviewed Journal article 2023 fthsvestlandet https://doi.org/10.1002/ppp.2192 2024-02-02T12:41:09Z Arctic wetlands are a globally significant store of soil organic carbon. They are often characterized by ice-wedge polygons, which are diagnostic of lowland permafrost, and which greatly influence wetland hydrology and biogeochemistry during summer. The degradation of ice-wedge polygons, which can occur in response to climate change or local disturbance, has poorly understood consequences for biogeochemical processes. We therefore used geochemical analyses from the active layer and top permafrost to identify and compare the dominant biogeochemical processes in high-centered (degraded) and low-centered (pristine) polygons situated in the raised beach sediments and valley-infill sediments of Adventdalen, Central Svalbard. We found similar organic-rich sediments in both cases (up to 38 dry wt.%), but while low-centered polygons were water-saturated, their high-centered counterparts had a relatively dry active layer. Consequently, low-centered polygons showed evidence of iron and sulfate reduction leading to the precipitation of pyrite and siderite, whilst the high-centered polygons demonstrated more oxidizing conditions, with decreased iron oxidation and low preservation of iron and sulfate reduction products in the sediments. This study thus demonstrates the profound effect of ice-wedge polygon degradation on the redox chemistry of the host sediment and porewater, namely more oxidizing conditions, a decrease in iron reduction, and a decrease in the preservation of iron and sulfate reduction products. publishedVersion Article in Journal/Newspaper Adventdalen Arctic Climate change Ice permafrost Permafrost and Periglacial Processes Svalbard wedge* Høgskulen på Vestlandet: HVL Open Arctic Svalbard Adventdalen ENVELOPE(16.264,16.264,78.181,78.181) Raised Beach ENVELOPE(163.783,163.783,-74.983,-74.983) Permafrost and Periglacial Processes 34 3 359 369 |
institution |
Open Polar |
collection |
Høgskulen på Vestlandet: HVL Open |
op_collection_id |
fthsvestlandet |
language |
English |
description |
Arctic wetlands are a globally significant store of soil organic carbon. They are often characterized by ice-wedge polygons, which are diagnostic of lowland permafrost, and which greatly influence wetland hydrology and biogeochemistry during summer. The degradation of ice-wedge polygons, which can occur in response to climate change or local disturbance, has poorly understood consequences for biogeochemical processes. We therefore used geochemical analyses from the active layer and top permafrost to identify and compare the dominant biogeochemical processes in high-centered (degraded) and low-centered (pristine) polygons situated in the raised beach sediments and valley-infill sediments of Adventdalen, Central Svalbard. We found similar organic-rich sediments in both cases (up to 38 dry wt.%), but while low-centered polygons were water-saturated, their high-centered counterparts had a relatively dry active layer. Consequently, low-centered polygons showed evidence of iron and sulfate reduction leading to the precipitation of pyrite and siderite, whilst the high-centered polygons demonstrated more oxidizing conditions, with decreased iron oxidation and low preservation of iron and sulfate reduction products in the sediments. This study thus demonstrates the profound effect of ice-wedge polygon degradation on the redox chemistry of the host sediment and porewater, namely more oxidizing conditions, a decrease in iron reduction, and a decrease in the preservation of iron and sulfate reduction products. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Jones, Eleanor L. Hodson, Andrew Redeker, Kelly Robert Christiansen, Hanne H. Thornton, Steve F. Rogers, Jade |
spellingShingle |
Jones, Eleanor L. Hodson, Andrew Redeker, Kelly Robert Christiansen, Hanne H. Thornton, Steve F. Rogers, Jade Biogeochemistry of low- and high-centered ice-wedge polygons in wetlands in Svalbard |
author_facet |
Jones, Eleanor L. Hodson, Andrew Redeker, Kelly Robert Christiansen, Hanne H. Thornton, Steve F. Rogers, Jade |
author_sort |
Jones, Eleanor L. |
title |
Biogeochemistry of low- and high-centered ice-wedge polygons in wetlands in Svalbard |
title_short |
Biogeochemistry of low- and high-centered ice-wedge polygons in wetlands in Svalbard |
title_full |
Biogeochemistry of low- and high-centered ice-wedge polygons in wetlands in Svalbard |
title_fullStr |
Biogeochemistry of low- and high-centered ice-wedge polygons in wetlands in Svalbard |
title_full_unstemmed |
Biogeochemistry of low- and high-centered ice-wedge polygons in wetlands in Svalbard |
title_sort |
biogeochemistry of low- and high-centered ice-wedge polygons in wetlands in svalbard |
publisher |
Wiley |
publishDate |
2023 |
url |
https://hdl.handle.net/11250/3071940 https://doi.org/10.1002/ppp.2192 |
long_lat |
ENVELOPE(16.264,16.264,78.181,78.181) ENVELOPE(163.783,163.783,-74.983,-74.983) |
geographic |
Arctic Svalbard Adventdalen Raised Beach |
geographic_facet |
Arctic Svalbard Adventdalen Raised Beach |
genre |
Adventdalen Arctic Climate change Ice permafrost Permafrost and Periglacial Processes Svalbard wedge* |
genre_facet |
Adventdalen Arctic Climate change Ice permafrost Permafrost and Periglacial Processes Svalbard wedge* |
op_source |
Permafrost and Periglacial Processes |
op_relation |
EU/JPI Topic 2 (Project 71126) Norges forskningsråd: 244906 Norges forskningsråd: 294764 urn:issn:1045-6740 https://hdl.handle.net/11250/3071940 https://doi.org/10.1002/ppp.2192 cristin:2146470 |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no © 2023 The Authors |
op_doi |
https://doi.org/10.1002/ppp.2192 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
34 |
container_issue |
3 |
container_start_page |
359 |
op_container_end_page |
369 |
_version_ |
1792496251913109504 |