Cryoturbation leads to iron-organic carbon associations along a permafrost soil chronosequence in northern Alaska
In permafrost soils, substantial amounts of organic carbon (OC) are potentially protected from microbial degradation and transformation into greenhouse gases by association with reactive iron (Fe) minerals. As permafrost environments respond to climate change, increased drainage of thaw lakes in per...
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ftzenodo:oai:zenodo.org:5171830 2023-05-15T17:57:02+02:00 Cryoturbation leads to iron-organic carbon associations along a permafrost soil chronosequence in northern Alaska Joss, Hanna Patzner, Monique S. Maisch, Markus Mueller, Carsten W. Kappler, Andreas Bryce, Casey 2021-08-09 https://zenodo.org/record/5171830 https://doi.org/10.5281/zenodo.5171830 eng eng doi:10.31223/X52S67 doi:10.5281/zenodo.5171829 https://zenodo.org/record/5171830 https://doi.org/10.5281/zenodo.5171830 oai:zenodo.org:5171830 info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode carbon iron thermokarst cryoturbation info:eu-repo/semantics/other dataset 2021 ftzenodo https://doi.org/10.5281/zenodo.517183010.31223/X52S6710.5281/zenodo.5171829 2023-03-11T02:45:19Z In permafrost soils, substantial amounts of organic carbon (OC) are potentially protected from microbial degradation and transformation into greenhouse gases by association with reactive iron (Fe) minerals. As permafrost environments respond to climate change, increased drainage of thaw lakes in permafrost regions is predicted. Soils will subsequently develop on these drained thaw lakes, but the role of Fe-OC associations in future OC stabilization during this predicted soil development is unknown. To fill this knowledge gap, we have examined Fe-OC associations in organic, cryoturbated and mineral horizons along a 5500-year chronosequence of drained thaw lake basins in Utqiaġvik, Alaska. By applying chemical extractions, we found that ~17 % of the total OC content in cryoturbated horizons is associated with reactive Fe minerals, compared to ~10 % in organic or mineral horizons. As soil development advances, the total stocks of Fe-associated OC more than double within the first 50 years after thaw lake drainage, because of increased storage of Fe-associated OC in cryoturbated horizons (from 8 to 75 % of the total Fe-associated OC stock). Spatially-resolved nanoscale secondary ion mass spectrometry showed that OC is primarily associated with Fe(III) (oxyhydr)oxides which were identified by 57Fe Mössbauer spectroscopy as ferrihydrite. High OC:Fe mass ratios (>0.22) indicate that Fe-OC associations are formed via co-precipitation, chelation and aggregation. These results demonstrate that, given the proposed enhanced drainage of thaw lakes under climate change, OC is increasingly incorporated and stabilized by the association with reactive Fe minerals as a result of soil formation and increased cryoturbation. Dataset permafrost Thermokarst Alaska Zenodo |
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English |
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carbon iron thermokarst cryoturbation |
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carbon iron thermokarst cryoturbation Joss, Hanna Patzner, Monique S. Maisch, Markus Mueller, Carsten W. Kappler, Andreas Bryce, Casey Cryoturbation leads to iron-organic carbon associations along a permafrost soil chronosequence in northern Alaska |
topic_facet |
carbon iron thermokarst cryoturbation |
description |
In permafrost soils, substantial amounts of organic carbon (OC) are potentially protected from microbial degradation and transformation into greenhouse gases by association with reactive iron (Fe) minerals. As permafrost environments respond to climate change, increased drainage of thaw lakes in permafrost regions is predicted. Soils will subsequently develop on these drained thaw lakes, but the role of Fe-OC associations in future OC stabilization during this predicted soil development is unknown. To fill this knowledge gap, we have examined Fe-OC associations in organic, cryoturbated and mineral horizons along a 5500-year chronosequence of drained thaw lake basins in Utqiaġvik, Alaska. By applying chemical extractions, we found that ~17 % of the total OC content in cryoturbated horizons is associated with reactive Fe minerals, compared to ~10 % in organic or mineral horizons. As soil development advances, the total stocks of Fe-associated OC more than double within the first 50 years after thaw lake drainage, because of increased storage of Fe-associated OC in cryoturbated horizons (from 8 to 75 % of the total Fe-associated OC stock). Spatially-resolved nanoscale secondary ion mass spectrometry showed that OC is primarily associated with Fe(III) (oxyhydr)oxides which were identified by 57Fe Mössbauer spectroscopy as ferrihydrite. High OC:Fe mass ratios (>0.22) indicate that Fe-OC associations are formed via co-precipitation, chelation and aggregation. These results demonstrate that, given the proposed enhanced drainage of thaw lakes under climate change, OC is increasingly incorporated and stabilized by the association with reactive Fe minerals as a result of soil formation and increased cryoturbation. |
format |
Dataset |
author |
Joss, Hanna Patzner, Monique S. Maisch, Markus Mueller, Carsten W. Kappler, Andreas Bryce, Casey |
author_facet |
Joss, Hanna Patzner, Monique S. Maisch, Markus Mueller, Carsten W. Kappler, Andreas Bryce, Casey |
author_sort |
Joss, Hanna |
title |
Cryoturbation leads to iron-organic carbon associations along a permafrost soil chronosequence in northern Alaska |
title_short |
Cryoturbation leads to iron-organic carbon associations along a permafrost soil chronosequence in northern Alaska |
title_full |
Cryoturbation leads to iron-organic carbon associations along a permafrost soil chronosequence in northern Alaska |
title_fullStr |
Cryoturbation leads to iron-organic carbon associations along a permafrost soil chronosequence in northern Alaska |
title_full_unstemmed |
Cryoturbation leads to iron-organic carbon associations along a permafrost soil chronosequence in northern Alaska |
title_sort |
cryoturbation leads to iron-organic carbon associations along a permafrost soil chronosequence in northern alaska |
publishDate |
2021 |
url |
https://zenodo.org/record/5171830 https://doi.org/10.5281/zenodo.5171830 |
genre |
permafrost Thermokarst Alaska |
genre_facet |
permafrost Thermokarst Alaska |
op_relation |
doi:10.31223/X52S67 doi:10.5281/zenodo.5171829 https://zenodo.org/record/5171830 https://doi.org/10.5281/zenodo.5171830 oai:zenodo.org:5171830 |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by/4.0/legalcode |
op_doi |
https://doi.org/10.5281/zenodo.517183010.31223/X52S6710.5281/zenodo.5171829 |
_version_ |
1766165388554403840 |