DataSheet1_Iron Redistribution Upon Thermokarst Processes in the Yedoma Domain.docx
Ice-rich permafrost has been subject to abrupt thaw and thermokarst formation in the past and is vulnerable to current global warming. The ice-rich permafrost domain includes Yedoma sediments that have never thawed since deposition during the late Pleistocene and Alas sediments that were formed by p...
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ftsmithonian:oai:figshare.com:article/15041451 2023-05-15T15:05:51+02:00 DataSheet1_Iron Redistribution Upon Thermokarst Processes in the Yedoma Domain.docx Arthur Monhonval (11174751) Jens Strauss (5496671) Elisabeth Mauclet (11174754) Catherine Hirst (9032984) Nathan Bemelmans (11174757) Guido Grosse (6270902) Lutz Schirrmeister (5496662) Matthias Fuchs (131037) Sophie Opfergelt (1778602) 2021-07-23T04:20:39Z https://doi.org/10.3389/feart.2021.703339.s001 unknown https://figshare.com/articles/dataset/DataSheet1_Iron_Redistribution_Upon_Thermokarst_Processes_in_the_Yedoma_Domain_docx/15041451 doi:10.3389/feart.2021.703339.s001 CC BY 4.0 CC-BY Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change permafrost thaw redox processes carbon stabilization arctic subarctic Dataset 2021 ftsmithonian https://doi.org/10.3389/feart.2021.703339.s001 2021-07-25T16:27:41Z Ice-rich permafrost has been subject to abrupt thaw and thermokarst formation in the past and is vulnerable to current global warming. The ice-rich permafrost domain includes Yedoma sediments that have never thawed since deposition during the late Pleistocene and Alas sediments that were formed by previous thermokarst processes during the Lateglacial and Holocene warming. Permafrost thaw unlocks organic carbon (OC) and minerals from these deposits and exposes OC to mineralization. A portion of the OC can be associated with iron (Fe), a redox-sensitive element acting as a trap for OC. Post-depositional thaw processes may have induced changes in redox conditions in these deposits and thereby affected Fe distribution and interactions between OC and Fe, with knock-on effects on the role that Fe plays in mediating present day OC mineralization. To test this hypothesis, we measured Fe concentrations and proportion of Fe oxides and Fe complexed with OC in unthawed Yedoma and previously thawed Alas deposits. Total Fe concentrations were determined on 1,292 sediment samples from the Yedoma domain using portable X-ray fluorescence; these concentrations were corrected for trueness using a calibration based on a subset of 144 samples measured by inductively coupled plasma optical emission spectrometry after alkaline fusion (R 2 = 0.95). The total Fe concentration is stable with depth in Yedoma deposits, but we observe a depletion or accumulation of total Fe in Alas deposits, which experienced previous thaw and/or flooding events. Selective Fe extractions targeting reactive forms of Fe on unthawed and previously thawed deposits highlight that about 25% of the total Fe is present as reactive species, either as crystalline or amorphous oxides, or complexed with OC, with no significant difference in proportions of reactive Fe between Yedoma and Alas deposits. These results suggest that redox driven processes during past thermokarst formation impact the present-day distribution of total Fe, and thereby the total amount of reactive Fe in Alas versus Yedoma deposits. This study highlights that ongoing thermokarst lake formation and drainage dynamics in the Arctic influences reactive Fe distribution and thereby interactions between Fe and OC, OC mineralization rates, and greenhouse gas emissions. Dataset Arctic Climate change Global warming Ice permafrost Subarctic Thermokarst Unknown Arctic |
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Open Polar |
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Unknown |
op_collection_id |
ftsmithonian |
language |
unknown |
topic |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change permafrost thaw redox processes carbon stabilization arctic subarctic |
spellingShingle |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change permafrost thaw redox processes carbon stabilization arctic subarctic Arthur Monhonval (11174751) Jens Strauss (5496671) Elisabeth Mauclet (11174754) Catherine Hirst (9032984) Nathan Bemelmans (11174757) Guido Grosse (6270902) Lutz Schirrmeister (5496662) Matthias Fuchs (131037) Sophie Opfergelt (1778602) DataSheet1_Iron Redistribution Upon Thermokarst Processes in the Yedoma Domain.docx |
topic_facet |
Solid Earth Sciences Climate Science Atmospheric Sciences not elsewhere classified Exploration Geochemistry Inorganic Geochemistry Isotope Geochemistry Organic Geochemistry Geochemistry not elsewhere classified Igneous and Metamorphic Petrology Ore Deposit Petrology Palaeontology (incl. Palynology) Structural Geology Tectonics Volcanology Geology not elsewhere classified Seismology and Seismic Exploration Glaciology Hydrogeology Natural Hazards Quaternary Environments Earth Sciences not elsewhere classified Evolutionary Impacts of Climate Change permafrost thaw redox processes carbon stabilization arctic subarctic |
description |
Ice-rich permafrost has been subject to abrupt thaw and thermokarst formation in the past and is vulnerable to current global warming. The ice-rich permafrost domain includes Yedoma sediments that have never thawed since deposition during the late Pleistocene and Alas sediments that were formed by previous thermokarst processes during the Lateglacial and Holocene warming. Permafrost thaw unlocks organic carbon (OC) and minerals from these deposits and exposes OC to mineralization. A portion of the OC can be associated with iron (Fe), a redox-sensitive element acting as a trap for OC. Post-depositional thaw processes may have induced changes in redox conditions in these deposits and thereby affected Fe distribution and interactions between OC and Fe, with knock-on effects on the role that Fe plays in mediating present day OC mineralization. To test this hypothesis, we measured Fe concentrations and proportion of Fe oxides and Fe complexed with OC in unthawed Yedoma and previously thawed Alas deposits. Total Fe concentrations were determined on 1,292 sediment samples from the Yedoma domain using portable X-ray fluorescence; these concentrations were corrected for trueness using a calibration based on a subset of 144 samples measured by inductively coupled plasma optical emission spectrometry after alkaline fusion (R 2 = 0.95). The total Fe concentration is stable with depth in Yedoma deposits, but we observe a depletion or accumulation of total Fe in Alas deposits, which experienced previous thaw and/or flooding events. Selective Fe extractions targeting reactive forms of Fe on unthawed and previously thawed deposits highlight that about 25% of the total Fe is present as reactive species, either as crystalline or amorphous oxides, or complexed with OC, with no significant difference in proportions of reactive Fe between Yedoma and Alas deposits. These results suggest that redox driven processes during past thermokarst formation impact the present-day distribution of total Fe, and thereby the total amount of reactive Fe in Alas versus Yedoma deposits. This study highlights that ongoing thermokarst lake formation and drainage dynamics in the Arctic influences reactive Fe distribution and thereby interactions between Fe and OC, OC mineralization rates, and greenhouse gas emissions. |
format |
Dataset |
author |
Arthur Monhonval (11174751) Jens Strauss (5496671) Elisabeth Mauclet (11174754) Catherine Hirst (9032984) Nathan Bemelmans (11174757) Guido Grosse (6270902) Lutz Schirrmeister (5496662) Matthias Fuchs (131037) Sophie Opfergelt (1778602) |
author_facet |
Arthur Monhonval (11174751) Jens Strauss (5496671) Elisabeth Mauclet (11174754) Catherine Hirst (9032984) Nathan Bemelmans (11174757) Guido Grosse (6270902) Lutz Schirrmeister (5496662) Matthias Fuchs (131037) Sophie Opfergelt (1778602) |
author_sort |
Arthur Monhonval (11174751) |
title |
DataSheet1_Iron Redistribution Upon Thermokarst Processes in the Yedoma Domain.docx |
title_short |
DataSheet1_Iron Redistribution Upon Thermokarst Processes in the Yedoma Domain.docx |
title_full |
DataSheet1_Iron Redistribution Upon Thermokarst Processes in the Yedoma Domain.docx |
title_fullStr |
DataSheet1_Iron Redistribution Upon Thermokarst Processes in the Yedoma Domain.docx |
title_full_unstemmed |
DataSheet1_Iron Redistribution Upon Thermokarst Processes in the Yedoma Domain.docx |
title_sort |
datasheet1_iron redistribution upon thermokarst processes in the yedoma domain.docx |
publishDate |
2021 |
url |
https://doi.org/10.3389/feart.2021.703339.s001 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change Global warming Ice permafrost Subarctic Thermokarst |
genre_facet |
Arctic Climate change Global warming Ice permafrost Subarctic Thermokarst |
op_relation |
https://figshare.com/articles/dataset/DataSheet1_Iron_Redistribution_Upon_Thermokarst_Processes_in_the_Yedoma_Domain_docx/15041451 doi:10.3389/feart.2021.703339.s001 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2021.703339.s001 |
_version_ |
1766337536227016704 |