To what extent do iron organic carbon interactions attenuate C release from permafrost thaw?
Enhanced thawing of the permafrost in a warming Arctic exposes previously frozen soil organic carbon (OC) to microbial decomposition, leading to the release of soil C as greenhouse gases. Depending on temperature and moisture environmental variables, a centennial to millennial-yearold C pool can be...
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ftunistlouisbrus:oai:dial.uclouvain.be:boreal:287443 2024-06-23T07:50:09+00:00 To what extent do iron organic carbon interactions attenuate C release from permafrost thaw? Opfergelt, Sophie Roux, Philippe du Bois d'Aische, Eléonore Villani, Maëlle Thomas, Maxime Osy de Zegwaart-Favart, Cécile 2024 Belgian Polar Community Day (APECS event) UCL - SST/ELI/ELIE - Environmental Sciences 2024 http://hdl.handle.net/2078.1/287443 eng eng info:eu-repo/grantAgreement/BELSPO/IMPULS/RT/23/LIFTHAW boreal:287443 http://hdl.handle.net/2078.1/287443 info:eu-repo/semantics/conferenceObject 2024 ftunistlouisbrus 2024-05-27T23:50:22Z Enhanced thawing of the permafrost in a warming Arctic exposes previously frozen soil organic carbon (OC) to microbial decomposition, leading to the release of soil C as greenhouse gases. Depending on temperature and moisture environmental variables, a centennial to millennial-yearold C pool can be reached, thus accelerating the feedback to climate change. Iron-OC interactions in soils and sediments contribute to stabilize OC (by adsorption onto Fe oxides or forming Fe-OC complexes), thus mitigating permafrost C emissions. However, their formation and stability are dependent on soil pH and redox conditions. The heterogeneous soil moisture conditions and drastic changes in soil water pathways upon permafrost thaw make the significance of Fe-OC interactions in attenuating permafrost C emissions uncertain. Using radiogenic Sr isotopes, we show that, in saturated layers, Fe-OC interactions can remain undissociated and preserved since their formation. In contrast, we highlight that at the redox interface, processes of dissolution and precipitation of the Fe-OC interactions occur, changing the OC stabilization potential. Given the implications for overall long-term ecosystem C storage, we will discuss an approach to estimate at the landscape scale in the Arctic: (i) the proportion of permafrost soils Fe with potential for interactions with OC (reactive Fe), and (ii) the locations which are the most sensitive to changes in Fe-OC interactions. Conference Object Arctic Climate change permafrost DIAL@USL-B (Université Saint-Louis, Bruxelles) Arctic |
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DIAL@USL-B (Université Saint-Louis, Bruxelles) |
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ftunistlouisbrus |
language |
English |
description |
Enhanced thawing of the permafrost in a warming Arctic exposes previously frozen soil organic carbon (OC) to microbial decomposition, leading to the release of soil C as greenhouse gases. Depending on temperature and moisture environmental variables, a centennial to millennial-yearold C pool can be reached, thus accelerating the feedback to climate change. Iron-OC interactions in soils and sediments contribute to stabilize OC (by adsorption onto Fe oxides or forming Fe-OC complexes), thus mitigating permafrost C emissions. However, their formation and stability are dependent on soil pH and redox conditions. The heterogeneous soil moisture conditions and drastic changes in soil water pathways upon permafrost thaw make the significance of Fe-OC interactions in attenuating permafrost C emissions uncertain. Using radiogenic Sr isotopes, we show that, in saturated layers, Fe-OC interactions can remain undissociated and preserved since their formation. In contrast, we highlight that at the redox interface, processes of dissolution and precipitation of the Fe-OC interactions occur, changing the OC stabilization potential. Given the implications for overall long-term ecosystem C storage, we will discuss an approach to estimate at the landscape scale in the Arctic: (i) the proportion of permafrost soils Fe with potential for interactions with OC (reactive Fe), and (ii) the locations which are the most sensitive to changes in Fe-OC interactions. |
author2 |
UCL - SST/ELI/ELIE - Environmental Sciences |
format |
Conference Object |
author |
Opfergelt, Sophie Roux, Philippe du Bois d'Aische, Eléonore Villani, Maëlle Thomas, Maxime Osy de Zegwaart-Favart, Cécile 2024 Belgian Polar Community Day (APECS event) |
spellingShingle |
Opfergelt, Sophie Roux, Philippe du Bois d'Aische, Eléonore Villani, Maëlle Thomas, Maxime Osy de Zegwaart-Favart, Cécile 2024 Belgian Polar Community Day (APECS event) To what extent do iron organic carbon interactions attenuate C release from permafrost thaw? |
author_facet |
Opfergelt, Sophie Roux, Philippe du Bois d'Aische, Eléonore Villani, Maëlle Thomas, Maxime Osy de Zegwaart-Favart, Cécile 2024 Belgian Polar Community Day (APECS event) |
author_sort |
Opfergelt, Sophie |
title |
To what extent do iron organic carbon interactions attenuate C release from permafrost thaw? |
title_short |
To what extent do iron organic carbon interactions attenuate C release from permafrost thaw? |
title_full |
To what extent do iron organic carbon interactions attenuate C release from permafrost thaw? |
title_fullStr |
To what extent do iron organic carbon interactions attenuate C release from permafrost thaw? |
title_full_unstemmed |
To what extent do iron organic carbon interactions attenuate C release from permafrost thaw? |
title_sort |
to what extent do iron organic carbon interactions attenuate c release from permafrost thaw? |
publishDate |
2024 |
url |
http://hdl.handle.net/2078.1/287443 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change permafrost |
genre_facet |
Arctic Climate change permafrost |
op_relation |
info:eu-repo/grantAgreement/BELSPO/IMPULS/RT/23/LIFTHAW boreal:287443 http://hdl.handle.net/2078.1/287443 |
_version_ |
1802641020639248384 |