Silicon Isotopes: A Tool to Capture Winter Biogeochemical Connectivity in Permafrost Soils (Stordalen, Sweden)
Silicon isotope fractionation upon amorphous silica precipitation is susceptible to freeze-thaw cycles. Here we make use of this characteristic to distinguish between a closed system in freezing soils: where silicic acid concentration is increasing, leading to amorphous silica precipitation that ind...
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ftunistlouisbrus:oai:dial.uclouvain.be:boreal:268690 2024-05-12T08:09:37+00:00 Silicon Isotopes: A Tool to Capture Winter Biogeochemical Connectivity in Permafrost Soils (Stordalen, Sweden) Villani, Maëlle Hirst, Catherine Lundin, Erik Giesler, Reiner Mörth, Magnus Opfergelt, Sophie AGU Fall Meeting 2022 UCL - SST/ELI/ELIE - Environmental Sciences 2022 http://hdl.handle.net/2078.1/268690 eng eng info:eu-repo/grantAgreement/FNRS/FNRS/FC 49507 boreal:268690 http://hdl.handle.net/2078.1/268690 Permafrost silicon isotopes iron carbon taliks connectivity info:eu-repo/semantics/conferenceObject 2022 ftunistlouisbrus 2024-04-18T17:09:55Z Silicon isotope fractionation upon amorphous silica precipitation is susceptible to freeze-thaw cycles. Here we make use of this characteristic to distinguish between a closed system in freezing soils: where silicic acid concentration is increasing, leading to amorphous silica precipitation that induces Si isotope fractionation where 28Si is preferentially incorporated into the colloidal amorphous silica; and an open system in freezing soils: where silicic acid is mixing with surrounding soil pore waters and amorphous silica precipitation is not induced. We analyzed a temporal series of soil pore water collected from September to November 2021 on a natural gradient of permafrost degradation from a palsa (closed system) to a fen (open system) in Stordalen, Sweden. We compare the evolution of the δ30Si values in soil pore waters where freeze-up has occurred (closed system) or where freeze-up is delayed or absent (open system). We couple our δ30Si data with variations in redox-sensitive element (e.g., Fe) concentrations, sensitive to limited biogeochemical connectivity in a closed system. The dual-approach of silicon isotope geochemistry with redox sensitive element analysis has important implications for capturing the lateral transfer of water and nutrients from permafrost soils during winter months. Conference Object palsa permafrost DIAL@USL-B (Université Saint-Louis, Bruxelles) Stordalen ENVELOPE(7.337,7.337,62.510,62.510) |
institution |
Open Polar |
collection |
DIAL@USL-B (Université Saint-Louis, Bruxelles) |
op_collection_id |
ftunistlouisbrus |
language |
English |
topic |
Permafrost silicon isotopes iron carbon taliks connectivity |
spellingShingle |
Permafrost silicon isotopes iron carbon taliks connectivity Villani, Maëlle Hirst, Catherine Lundin, Erik Giesler, Reiner Mörth, Magnus Opfergelt, Sophie AGU Fall Meeting 2022 Silicon Isotopes: A Tool to Capture Winter Biogeochemical Connectivity in Permafrost Soils (Stordalen, Sweden) |
topic_facet |
Permafrost silicon isotopes iron carbon taliks connectivity |
description |
Silicon isotope fractionation upon amorphous silica precipitation is susceptible to freeze-thaw cycles. Here we make use of this characteristic to distinguish between a closed system in freezing soils: where silicic acid concentration is increasing, leading to amorphous silica precipitation that induces Si isotope fractionation where 28Si is preferentially incorporated into the colloidal amorphous silica; and an open system in freezing soils: where silicic acid is mixing with surrounding soil pore waters and amorphous silica precipitation is not induced. We analyzed a temporal series of soil pore water collected from September to November 2021 on a natural gradient of permafrost degradation from a palsa (closed system) to a fen (open system) in Stordalen, Sweden. We compare the evolution of the δ30Si values in soil pore waters where freeze-up has occurred (closed system) or where freeze-up is delayed or absent (open system). We couple our δ30Si data with variations in redox-sensitive element (e.g., Fe) concentrations, sensitive to limited biogeochemical connectivity in a closed system. The dual-approach of silicon isotope geochemistry with redox sensitive element analysis has important implications for capturing the lateral transfer of water and nutrients from permafrost soils during winter months. |
author2 |
UCL - SST/ELI/ELIE - Environmental Sciences |
format |
Conference Object |
author |
Villani, Maëlle Hirst, Catherine Lundin, Erik Giesler, Reiner Mörth, Magnus Opfergelt, Sophie AGU Fall Meeting 2022 |
author_facet |
Villani, Maëlle Hirst, Catherine Lundin, Erik Giesler, Reiner Mörth, Magnus Opfergelt, Sophie AGU Fall Meeting 2022 |
author_sort |
Villani, Maëlle |
title |
Silicon Isotopes: A Tool to Capture Winter Biogeochemical Connectivity in Permafrost Soils (Stordalen, Sweden) |
title_short |
Silicon Isotopes: A Tool to Capture Winter Biogeochemical Connectivity in Permafrost Soils (Stordalen, Sweden) |
title_full |
Silicon Isotopes: A Tool to Capture Winter Biogeochemical Connectivity in Permafrost Soils (Stordalen, Sweden) |
title_fullStr |
Silicon Isotopes: A Tool to Capture Winter Biogeochemical Connectivity in Permafrost Soils (Stordalen, Sweden) |
title_full_unstemmed |
Silicon Isotopes: A Tool to Capture Winter Biogeochemical Connectivity in Permafrost Soils (Stordalen, Sweden) |
title_sort |
silicon isotopes: a tool to capture winter biogeochemical connectivity in permafrost soils (stordalen, sweden) |
publishDate |
2022 |
url |
http://hdl.handle.net/2078.1/268690 |
long_lat |
ENVELOPE(7.337,7.337,62.510,62.510) |
geographic |
Stordalen |
geographic_facet |
Stordalen |
genre |
palsa permafrost |
genre_facet |
palsa permafrost |
op_relation |
info:eu-repo/grantAgreement/FNRS/FNRS/FC 49507 boreal:268690 http://hdl.handle.net/2078.1/268690 |
_version_ |
1798852903355547648 |