Combining geochemical and geophysical parameters to characterize permafrost degradation at Abisko, Sweden: implications for iron-organic carbon interactions
Between 30 and 80% of soil organic carbon (OC) in permafrost environments can be stabilized by interactions with mineral surfaces or metals such as iron. Iron-OC interactions may be modified by changing hydrological conditions upon permafrost thaw resulting in local subsidence. The challenge is to i...
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ftunivlouvain:oai:dial.uclouvain.be:boreal:268744 2024-05-12T07:52:03+00:00 Combining geochemical and geophysical parameters to characterize permafrost degradation at Abisko, Sweden: implications for iron-organic carbon interactions du Bois d'Aische, Eléonore Thomas, Maxime Jonard, François Villani, Maëlle Hirst, Catherine Giesler, Reiner Mörth, Carl-Magnus Opfergelt, Sophie Arctic Science Summit Week UCL - SST/ELI/ELIE - Environmental Sciences 2023 http://hdl.handle.net/2078.1/268744 eng eng info:eu-repo/grantAgreement/UCLouvain/ARC/LandSense info:eu-repo/grantAgreement/UCLouvain/ERC/WeThaw boreal:268744 http://hdl.handle.net/2078.1/268744 permafrost iron carbon hydrology subsidence info:eu-repo/semantics/conferenceObject 2023 ftunivlouvain 2024-04-17T16:32:11Z Between 30 and 80% of soil organic carbon (OC) in permafrost environments can be stabilized by interactions with mineral surfaces or metals such as iron. Iron-OC interactions may be modified by changing hydrological conditions upon permafrost thaw resulting in local subsidence. The challenge is to identify the early stage of thermokarst landforms, and to quantify the influence of thermokarst development on Fe and OC released in soil pore water upon thawing. We monitored the soil water content (SWC), soil temperature and soil electrical conductivity (EC) together with the chemical composition of the soil pore water along a gradient of thermokarst development and subsequent permafrost degradation at Abisko, Sweden (palsa-bog-fen). More specifically, we combined geophysical parameters (elevation, active layer depth, SWC and soil EC) and physico-chemical parameters (pH and soil pore water EC) at the profile and slope scales, with concentrations of Fe and dissolved organic carbon (DOC) in soil pore water at the profile scale. The results highlight that (i) at the profile scale, elevation, active layer depth and SWC are relevant geophysical criteria to discriminate between palsa, bog and fen; (ii) permafrost degradation leads to the mobilization of Fe and DOC in soil pore water; (iii) at the slope scale, landscape areas can be classified as palsa, intermediate or fen based on the three geophysical criteria and this can be used to derive the conditions for the mobility of Fe and DOC. These data support that physical degradation of permafrost and subsequent changes in SWC with thermokarst landform development from palsa to fen likely influences the geochemical conditions for the stability of Fe-OC interactions. Conference Object Abisko palsa permafrost Thermokarst DIAL@UCLouvain (Université catholique de Louvain) Abisko ENVELOPE(18.829,18.829,68.349,68.349) |
institution |
Open Polar |
collection |
DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
language |
English |
topic |
permafrost iron carbon hydrology subsidence |
spellingShingle |
permafrost iron carbon hydrology subsidence du Bois d'Aische, Eléonore Thomas, Maxime Jonard, François Villani, Maëlle Hirst, Catherine Giesler, Reiner Mörth, Carl-Magnus Opfergelt, Sophie Arctic Science Summit Week Combining geochemical and geophysical parameters to characterize permafrost degradation at Abisko, Sweden: implications for iron-organic carbon interactions |
topic_facet |
permafrost iron carbon hydrology subsidence |
description |
Between 30 and 80% of soil organic carbon (OC) in permafrost environments can be stabilized by interactions with mineral surfaces or metals such as iron. Iron-OC interactions may be modified by changing hydrological conditions upon permafrost thaw resulting in local subsidence. The challenge is to identify the early stage of thermokarst landforms, and to quantify the influence of thermokarst development on Fe and OC released in soil pore water upon thawing. We monitored the soil water content (SWC), soil temperature and soil electrical conductivity (EC) together with the chemical composition of the soil pore water along a gradient of thermokarst development and subsequent permafrost degradation at Abisko, Sweden (palsa-bog-fen). More specifically, we combined geophysical parameters (elevation, active layer depth, SWC and soil EC) and physico-chemical parameters (pH and soil pore water EC) at the profile and slope scales, with concentrations of Fe and dissolved organic carbon (DOC) in soil pore water at the profile scale. The results highlight that (i) at the profile scale, elevation, active layer depth and SWC are relevant geophysical criteria to discriminate between palsa, bog and fen; (ii) permafrost degradation leads to the mobilization of Fe and DOC in soil pore water; (iii) at the slope scale, landscape areas can be classified as palsa, intermediate or fen based on the three geophysical criteria and this can be used to derive the conditions for the mobility of Fe and DOC. These data support that physical degradation of permafrost and subsequent changes in SWC with thermokarst landform development from palsa to fen likely influences the geochemical conditions for the stability of Fe-OC interactions. |
author2 |
UCL - SST/ELI/ELIE - Environmental Sciences |
format |
Conference Object |
author |
du Bois d'Aische, Eléonore Thomas, Maxime Jonard, François Villani, Maëlle Hirst, Catherine Giesler, Reiner Mörth, Carl-Magnus Opfergelt, Sophie Arctic Science Summit Week |
author_facet |
du Bois d'Aische, Eléonore Thomas, Maxime Jonard, François Villani, Maëlle Hirst, Catherine Giesler, Reiner Mörth, Carl-Magnus Opfergelt, Sophie Arctic Science Summit Week |
author_sort |
du Bois d'Aische, Eléonore |
title |
Combining geochemical and geophysical parameters to characterize permafrost degradation at Abisko, Sweden: implications for iron-organic carbon interactions |
title_short |
Combining geochemical and geophysical parameters to characterize permafrost degradation at Abisko, Sweden: implications for iron-organic carbon interactions |
title_full |
Combining geochemical and geophysical parameters to characterize permafrost degradation at Abisko, Sweden: implications for iron-organic carbon interactions |
title_fullStr |
Combining geochemical and geophysical parameters to characterize permafrost degradation at Abisko, Sweden: implications for iron-organic carbon interactions |
title_full_unstemmed |
Combining geochemical and geophysical parameters to characterize permafrost degradation at Abisko, Sweden: implications for iron-organic carbon interactions |
title_sort |
combining geochemical and geophysical parameters to characterize permafrost degradation at abisko, sweden: implications for iron-organic carbon interactions |
publishDate |
2023 |
url |
http://hdl.handle.net/2078.1/268744 |
long_lat |
ENVELOPE(18.829,18.829,68.349,68.349) |
geographic |
Abisko |
geographic_facet |
Abisko |
genre |
Abisko palsa permafrost Thermokarst |
genre_facet |
Abisko palsa permafrost Thermokarst |
op_relation |
info:eu-repo/grantAgreement/UCLouvain/ARC/LandSense info:eu-repo/grantAgreement/UCLouvain/ERC/WeThaw boreal:268744 http://hdl.handle.net/2078.1/268744 |
_version_ |
1798845660215115776 |