Contrasting Export of Particulate Organic Carbon From Greenlandic Glacial and Nonglacial Streams
On-going shrinkage of Greenland's icecap, permafrost thaw, and changes in precipitation are exposing its landscapes to erosion and remobilization of ancient organic carbon (OC) held in soils and sedimentary rocks. The fate of this OC and potential feedbacks to climate are still unclear. Here, w...
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American Geophysical Union
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/582974 2023-05-15T16:29:02+02:00 Contrasting Export of Particulate Organic Carbon From Greenlandic Glacial and Nonglacial Streams Bröder, Lisa M. Hirst, Catherine A. Thomas, Maxime Vonk, Jorien E. Haghipour, Negar Eglinton, Timothy I. Fouché, Julien 2022-11-16 application/application/pdf https://hdl.handle.net/20.500.11850/582974 https://doi.org/10.3929/ethz-b-000582974 en eng American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2022GL101210 info:eu-repo/semantics/altIdentifier/wos/000887981800001 http://hdl.handle.net/20.500.11850/582974 doi:10.3929/ethz-b-000582974 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY Geophysical Research Letters, 49 (21) info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2022 ftethz https://doi.org/20.500.11850/582974 https://doi.org/10.3929/ethz-b-000582974 https://doi.org/10.1029/2022GL101210 2023-02-13T01:15:27Z On-going shrinkage of Greenland's icecap, permafrost thaw, and changes in precipitation are exposing its landscapes to erosion and remobilization of ancient organic carbon (OC) held in soils and sedimentary rocks. The fate of this OC and potential feedbacks to climate are still unclear. Here, we show that the glacial Zackenberg river (Northeastern Greenland) exports aged particulate OC (POC, uncalibrated radiocarbon ages of ∼4,000 years). Many of the smaller periglacial streams affected by abrupt permafrost thaw transport substantially older POC (up to 32,000 years), especially with enhanced discharge following intense precipitation. Mineralogical analysis, and density and size fractionation of soils and both glacial and nonglacial river sediments reveal that OC is largely associated with phyllosilicate minerals, suggesting stabilization against microbial processing. Enhanced export of ancient, mineral-associated OC as a consequence of summer rainfall may accelerate translocation of OC from terrestrial to marine environments, but could have limited consequences for climate. ISSN:0094-8276 ISSN:1944-8007 Article in Journal/Newspaper Greenland greenlandic permafrost Zackenberg ETH Zürich Research Collection Greenland |
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collection |
ETH Zürich Research Collection |
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ftethz |
language |
English |
description |
On-going shrinkage of Greenland's icecap, permafrost thaw, and changes in precipitation are exposing its landscapes to erosion and remobilization of ancient organic carbon (OC) held in soils and sedimentary rocks. The fate of this OC and potential feedbacks to climate are still unclear. Here, we show that the glacial Zackenberg river (Northeastern Greenland) exports aged particulate OC (POC, uncalibrated radiocarbon ages of ∼4,000 years). Many of the smaller periglacial streams affected by abrupt permafrost thaw transport substantially older POC (up to 32,000 years), especially with enhanced discharge following intense precipitation. Mineralogical analysis, and density and size fractionation of soils and both glacial and nonglacial river sediments reveal that OC is largely associated with phyllosilicate minerals, suggesting stabilization against microbial processing. Enhanced export of ancient, mineral-associated OC as a consequence of summer rainfall may accelerate translocation of OC from terrestrial to marine environments, but could have limited consequences for climate. ISSN:0094-8276 ISSN:1944-8007 |
format |
Article in Journal/Newspaper |
author |
Bröder, Lisa M. Hirst, Catherine A. Thomas, Maxime Vonk, Jorien E. Haghipour, Negar Eglinton, Timothy I. Fouché, Julien |
spellingShingle |
Bröder, Lisa M. Hirst, Catherine A. Thomas, Maxime Vonk, Jorien E. Haghipour, Negar Eglinton, Timothy I. Fouché, Julien Contrasting Export of Particulate Organic Carbon From Greenlandic Glacial and Nonglacial Streams |
author_facet |
Bröder, Lisa M. Hirst, Catherine A. Thomas, Maxime Vonk, Jorien E. Haghipour, Negar Eglinton, Timothy I. Fouché, Julien |
author_sort |
Bröder, Lisa M. |
title |
Contrasting Export of Particulate Organic Carbon From Greenlandic Glacial and Nonglacial Streams |
title_short |
Contrasting Export of Particulate Organic Carbon From Greenlandic Glacial and Nonglacial Streams |
title_full |
Contrasting Export of Particulate Organic Carbon From Greenlandic Glacial and Nonglacial Streams |
title_fullStr |
Contrasting Export of Particulate Organic Carbon From Greenlandic Glacial and Nonglacial Streams |
title_full_unstemmed |
Contrasting Export of Particulate Organic Carbon From Greenlandic Glacial and Nonglacial Streams |
title_sort |
contrasting export of particulate organic carbon from greenlandic glacial and nonglacial streams |
publisher |
American Geophysical Union |
publishDate |
2022 |
url |
https://hdl.handle.net/20.500.11850/582974 https://doi.org/10.3929/ethz-b-000582974 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland greenlandic permafrost Zackenberg |
genre_facet |
Greenland greenlandic permafrost Zackenberg |
op_source |
Geophysical Research Letters, 49 (21) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2022GL101210 info:eu-repo/semantics/altIdentifier/wos/000887981800001 http://hdl.handle.net/20.500.11850/582974 doi:10.3929/ethz-b-000582974 |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/20.500.11850/582974 https://doi.org/10.3929/ethz-b-000582974 https://doi.org/10.1029/2022GL101210 |
_version_ |
1766018725960482816 |