DataSheet1_Sources of CO2 Produced in Freshly Thawed Pleistocene-Age Yedoma Permafrost.docx
The release of greenhouse gases from the large organic carbon stock in permafrost deposits in the circumarctic regions may accelerate global warming upon thaw. The extent of this positive climate feedback is thought to be largely controlled by the microbial degradability of the organic matter preser...
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ftsmithonian:oai:figshare.com:article/18665867 2023-05-15T16:37:53+02:00 DataSheet1_Sources of CO2 Produced in Freshly Thawed Pleistocene-Age Yedoma Permafrost.docx Jan Olaf Melchert (11966306) Philipp Wischhöfer (11966309) Christian Knoblauch (10453262) Tim Eckhardt (11966312) Susanne Liebner (11174838) Janet Rethemeyer (9991820) 2022-01-19T04:02:35Z https://doi.org/10.3389/feart.2021.737237.s001 unknown https://figshare.com/articles/dataset/DataSheet1_Sources_of_CO2_Produced_in_Freshly_Thawed_Pleistocene-Age_Yedoma_Permafrost_docx/18665867 doi:10.3389/feart.2021.737237.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 yedoma ice complex permafost carbon cycle climat change thermokarst radiocarbon greenhouse gas Dataset 2022 ftsmithonian https://doi.org/10.3389/feart.2021.737237.s001 2022-01-21T12:56:25Z The release of greenhouse gases from the large organic carbon stock in permafrost deposits in the circumarctic regions may accelerate global warming upon thaw. The extent of this positive climate feedback is thought to be largely controlled by the microbial degradability of the organic matter preserved in these sediments. In addition, weathering and oxidation processes may release inorganic carbon preserved in permafrost sediments as CO 2 , which is generally not accounted for. We used 13 C and 14 C analysis and isotopic mass balances to differentiate and quantify organic and inorganic carbon released as CO 2 in the field from an active retrogressive thaw slump of Pleistocene-age Yedoma and during a 1.5-years incubation experiment. The results reveal that the dominant source of the CO 2 released from freshly thawed Yedoma exposed as thaw mound is Pleistocene-age organic matter (48–80%) and to a lesser extent modern organic substrate (3–34%). A significant portion of the CO 2 originated from inorganic carbon in the Yedoma (17–26%). The mixing of young, active layer material with Yedoma at a site on the slump floor led to the preferential mineralization of this young organic carbon source. Admixtures of younger organic substrates in the Yedoma thaw mound were small and thus rapidly consumed as shown by lower contributions to the CO 2 produced during few weeks of aerobic incubation at 4°C corresponding to approximately one thaw season. Future CO 2 fluxes from the freshly thawed Yedoma will contain higher proportions of ancient inorganic (22%) and organic carbon (61–78%) as suggested by the results at the end, after 1.5 years of incubation. The increasing contribution of inorganic carbon during the incubation is favored by the accumulation of organic acids from microbial organic matter degradation resulting in lower pH values and, in consequence, in inorganic carbon dissolution. Because part of the inorganic carbon pool is assumed to be of pedogenic origin, these emissions would ultimately not alter carbon budgets. The results of this study highlight the preferential degradation of younger organic substrates in freshly thawed Yedoma, if available, and a substantial release of CO 2 from inorganic sources. Dataset Ice permafrost Thermokarst Unknown |
institution |
Open Polar |
collection |
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 yedoma ice complex permafost carbon cycle climat change thermokarst radiocarbon greenhouse gas |
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 yedoma ice complex permafost carbon cycle climat change thermokarst radiocarbon greenhouse gas Jan Olaf Melchert (11966306) Philipp Wischhöfer (11966309) Christian Knoblauch (10453262) Tim Eckhardt (11966312) Susanne Liebner (11174838) Janet Rethemeyer (9991820) DataSheet1_Sources of CO2 Produced in Freshly Thawed Pleistocene-Age Yedoma Permafrost.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 yedoma ice complex permafost carbon cycle climat change thermokarst radiocarbon greenhouse gas |
description |
The release of greenhouse gases from the large organic carbon stock in permafrost deposits in the circumarctic regions may accelerate global warming upon thaw. The extent of this positive climate feedback is thought to be largely controlled by the microbial degradability of the organic matter preserved in these sediments. In addition, weathering and oxidation processes may release inorganic carbon preserved in permafrost sediments as CO 2 , which is generally not accounted for. We used 13 C and 14 C analysis and isotopic mass balances to differentiate and quantify organic and inorganic carbon released as CO 2 in the field from an active retrogressive thaw slump of Pleistocene-age Yedoma and during a 1.5-years incubation experiment. The results reveal that the dominant source of the CO 2 released from freshly thawed Yedoma exposed as thaw mound is Pleistocene-age organic matter (48–80%) and to a lesser extent modern organic substrate (3–34%). A significant portion of the CO 2 originated from inorganic carbon in the Yedoma (17–26%). The mixing of young, active layer material with Yedoma at a site on the slump floor led to the preferential mineralization of this young organic carbon source. Admixtures of younger organic substrates in the Yedoma thaw mound were small and thus rapidly consumed as shown by lower contributions to the CO 2 produced during few weeks of aerobic incubation at 4°C corresponding to approximately one thaw season. Future CO 2 fluxes from the freshly thawed Yedoma will contain higher proportions of ancient inorganic (22%) and organic carbon (61–78%) as suggested by the results at the end, after 1.5 years of incubation. The increasing contribution of inorganic carbon during the incubation is favored by the accumulation of organic acids from microbial organic matter degradation resulting in lower pH values and, in consequence, in inorganic carbon dissolution. Because part of the inorganic carbon pool is assumed to be of pedogenic origin, these emissions would ultimately not alter carbon budgets. The results of this study highlight the preferential degradation of younger organic substrates in freshly thawed Yedoma, if available, and a substantial release of CO 2 from inorganic sources. |
format |
Dataset |
author |
Jan Olaf Melchert (11966306) Philipp Wischhöfer (11966309) Christian Knoblauch (10453262) Tim Eckhardt (11966312) Susanne Liebner (11174838) Janet Rethemeyer (9991820) |
author_facet |
Jan Olaf Melchert (11966306) Philipp Wischhöfer (11966309) Christian Knoblauch (10453262) Tim Eckhardt (11966312) Susanne Liebner (11174838) Janet Rethemeyer (9991820) |
author_sort |
Jan Olaf Melchert (11966306) |
title |
DataSheet1_Sources of CO2 Produced in Freshly Thawed Pleistocene-Age Yedoma Permafrost.docx |
title_short |
DataSheet1_Sources of CO2 Produced in Freshly Thawed Pleistocene-Age Yedoma Permafrost.docx |
title_full |
DataSheet1_Sources of CO2 Produced in Freshly Thawed Pleistocene-Age Yedoma Permafrost.docx |
title_fullStr |
DataSheet1_Sources of CO2 Produced in Freshly Thawed Pleistocene-Age Yedoma Permafrost.docx |
title_full_unstemmed |
DataSheet1_Sources of CO2 Produced in Freshly Thawed Pleistocene-Age Yedoma Permafrost.docx |
title_sort |
datasheet1_sources of co2 produced in freshly thawed pleistocene-age yedoma permafrost.docx |
publishDate |
2022 |
url |
https://doi.org/10.3389/feart.2021.737237.s001 |
genre |
Ice permafrost Thermokarst |
genre_facet |
Ice permafrost Thermokarst |
op_relation |
https://figshare.com/articles/dataset/DataSheet1_Sources_of_CO2_Produced_in_Freshly_Thawed_Pleistocene-Age_Yedoma_Permafrost_docx/18665867 doi:10.3389/feart.2021.737237.s001 |
op_rights |
CC BY 4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2021.737237.s001 |
_version_ |
1766028187956936704 |