Data_Sheet_1_Downstream Evolution of Particulate Organic Matter Composition From Permafrost Thaw Slumps.docx
Permafrost soils, which store almost half of the global belowground organic carbon (OC), are susceptible to thaw upon climate warming. On the Peel Plateau of northwestern Canada, the number and size of retrogressive thaw slumps (RTS) has increased in recent decades due to rising temperatures and hig...
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ftfrontimediafig:oai:figshare.com:article/14332115 2023-05-15T15:01:52+02:00 Data_Sheet_1_Downstream Evolution of Particulate Organic Matter Composition From Permafrost Thaw Slumps.docx Kirsi H. Keskitalo Lisa Bröder Sarah Shakil Scott Zolkos Suzanne E. Tank Bart E. van Dongen Tommaso Tesi Negar Haghipour Timothy I. Eglinton Steven V. Kokelj Jorien E. Vonk 2021-03-29T04:38:52Z https://doi.org/10.3389/feart.2021.642675.s001 https://figshare.com/articles/dataset/Data_Sheet_1_Downstream_Evolution_of_Particulate_Organic_Matter_Composition_From_Permafrost_Thaw_Slumps_docx/14332115 unknown doi:10.3389/feart.2021.642675.s001 https://figshare.com/articles/dataset/Data_Sheet_1_Downstream_Evolution_of_Particulate_Organic_Matter_Composition_From_Permafrost_Thaw_Slumps_docx/14332115 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 Arctic climate carbon lipid biomarkers Peel Plateau permafrost pyrolysis-GCMS degradation Dataset 2021 ftfrontimediafig https://doi.org/10.3389/feart.2021.642675.s001 2021-03-31T22:58:55Z Permafrost soils, which store almost half of the global belowground organic carbon (OC), are susceptible to thaw upon climate warming. On the Peel Plateau of northwestern Canada, the number and size of retrogressive thaw slumps (RTS) has increased in recent decades due to rising temperatures and higher precipitation. These RTS features caused by the rapid thaw of ice-rich permafrost release organic matter dominantly as particulate organic carbon (POC) to the stream network. In this study, we sampled POC and streambank sediments along a fluvial transect (∼12 km) downstream from two RTS features and assessed the composition and degradation status of the mobilized permafrost OC. We found that RTS features add old, Pleistocene-aged permafrost POC to the stream system that is traceable kilometers downstream. The POC released consists mainly of recalcitrant compounds that persists within stream networks, whereas labile compounds originate from the active layer and appear to largely degrade within the scar zone of the RTS feature. Thermokarst on the Peel Plateau is likely to intensify in the future, but our data suggest that most of the permafrost OC released is not readily degradable within the stream system and thus may have little potential for atmospheric evasion. Possibilities for the recalcitrant OC to degrade over decadal to millennial time scales while being transported via larger river networks, and within the marine environment, do however, still exist. These findings add to our understanding of the vulnerable Arctic landscapes and how they may interact with the global climate. Dataset Arctic Climate change Ice permafrost Thermokarst Frontiers: Figshare Arctic Canada |
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Open Polar |
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Frontiers: Figshare |
op_collection_id |
ftfrontimediafig |
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 Arctic climate carbon lipid biomarkers Peel Plateau permafrost pyrolysis-GCMS degradation |
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 Arctic climate carbon lipid biomarkers Peel Plateau permafrost pyrolysis-GCMS degradation Kirsi H. Keskitalo Lisa Bröder Sarah Shakil Scott Zolkos Suzanne E. Tank Bart E. van Dongen Tommaso Tesi Negar Haghipour Timothy I. Eglinton Steven V. Kokelj Jorien E. Vonk Data_Sheet_1_Downstream Evolution of Particulate Organic Matter Composition From Permafrost Thaw Slumps.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 Arctic climate carbon lipid biomarkers Peel Plateau permafrost pyrolysis-GCMS degradation |
description |
Permafrost soils, which store almost half of the global belowground organic carbon (OC), are susceptible to thaw upon climate warming. On the Peel Plateau of northwestern Canada, the number and size of retrogressive thaw slumps (RTS) has increased in recent decades due to rising temperatures and higher precipitation. These RTS features caused by the rapid thaw of ice-rich permafrost release organic matter dominantly as particulate organic carbon (POC) to the stream network. In this study, we sampled POC and streambank sediments along a fluvial transect (∼12 km) downstream from two RTS features and assessed the composition and degradation status of the mobilized permafrost OC. We found that RTS features add old, Pleistocene-aged permafrost POC to the stream system that is traceable kilometers downstream. The POC released consists mainly of recalcitrant compounds that persists within stream networks, whereas labile compounds originate from the active layer and appear to largely degrade within the scar zone of the RTS feature. Thermokarst on the Peel Plateau is likely to intensify in the future, but our data suggest that most of the permafrost OC released is not readily degradable within the stream system and thus may have little potential for atmospheric evasion. Possibilities for the recalcitrant OC to degrade over decadal to millennial time scales while being transported via larger river networks, and within the marine environment, do however, still exist. These findings add to our understanding of the vulnerable Arctic landscapes and how they may interact with the global climate. |
format |
Dataset |
author |
Kirsi H. Keskitalo Lisa Bröder Sarah Shakil Scott Zolkos Suzanne E. Tank Bart E. van Dongen Tommaso Tesi Negar Haghipour Timothy I. Eglinton Steven V. Kokelj Jorien E. Vonk |
author_facet |
Kirsi H. Keskitalo Lisa Bröder Sarah Shakil Scott Zolkos Suzanne E. Tank Bart E. van Dongen Tommaso Tesi Negar Haghipour Timothy I. Eglinton Steven V. Kokelj Jorien E. Vonk |
author_sort |
Kirsi H. Keskitalo |
title |
Data_Sheet_1_Downstream Evolution of Particulate Organic Matter Composition From Permafrost Thaw Slumps.docx |
title_short |
Data_Sheet_1_Downstream Evolution of Particulate Organic Matter Composition From Permafrost Thaw Slumps.docx |
title_full |
Data_Sheet_1_Downstream Evolution of Particulate Organic Matter Composition From Permafrost Thaw Slumps.docx |
title_fullStr |
Data_Sheet_1_Downstream Evolution of Particulate Organic Matter Composition From Permafrost Thaw Slumps.docx |
title_full_unstemmed |
Data_Sheet_1_Downstream Evolution of Particulate Organic Matter Composition From Permafrost Thaw Slumps.docx |
title_sort |
data_sheet_1_downstream evolution of particulate organic matter composition from permafrost thaw slumps.docx |
publishDate |
2021 |
url |
https://doi.org/10.3389/feart.2021.642675.s001 https://figshare.com/articles/dataset/Data_Sheet_1_Downstream_Evolution_of_Particulate_Organic_Matter_Composition_From_Permafrost_Thaw_Slumps_docx/14332115 |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic Climate change Ice permafrost Thermokarst |
genre_facet |
Arctic Climate change Ice permafrost Thermokarst |
op_relation |
doi:10.3389/feart.2021.642675.s001 https://figshare.com/articles/dataset/Data_Sheet_1_Downstream_Evolution_of_Particulate_Organic_Matter_Composition_From_Permafrost_Thaw_Slumps_docx/14332115 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2021.642675.s001 |
_version_ |
1766333865829335040 |