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...
Published in: | Geophysical Research Letters |
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Language: | English |
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American Geophysical Union (AGU)
2022
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Online Access: | http://hdl.handle.net/2078.1/267042 https://doi.org/10.1029/2022gl101210 |
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ftunivlouvain:oai:dial.uclouvain.be:boreal:267042 2024-05-12T08:04:00+00:00 Contrasting Export of Particulate Organic Carbon From Greenlandic Glacial and Nonglacial Streams Bröder, Lisa Hirst, Catherine Opfergelt, Sophie Thomas, Maxime Vonk, J. E. Haghipour, N. Eglinton, T. I. Fouché, J. Swiss Federal Institute of Technology (ETH) - Geological Institute, Department of Earth Sciences UCL - SST/ELI/ELIE - Environmental Sciences 2022 http://hdl.handle.net/2078.1/267042 https://doi.org/10.1029/2022gl101210 eng eng American Geophysical Union (AGU) info:eu-repo/grantAgreement/INTERACT/European Union H2020/Grant 871120 info:eu-repo/grantAgreement/ERC/European Union's Horizon 2020 research and innovation programme/WeThaw info:eu-repo/grantAgreement/ERC/European Union's Horizon 2020 research and innovation programme/Thawsome boreal:267042 http://hdl.handle.net/2078.1/267042 doi:10.1029/2022gl101210 urn:ISSN:0094-8276 urn:EISSN:1944-8007 info:eu-repo/semantics/openAccess Geophysical Research Letters, Vol. 49, no.21, p. 1 (2022) particulate organic carbon Greenland glacier stream radiocarbon permafrost info:eu-repo/semantics/article 2022 ftunivlouvain https://doi.org/10.1029/2022gl101210 2024-04-17T16:32:40Z 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. Article in Journal/Newspaper glacier Greenland greenlandic permafrost Zackenberg DIAL@UCLouvain (Université catholique de Louvain) Greenland Geophysical Research Letters 49 21 |
institution |
Open Polar |
collection |
DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
language |
English |
topic |
particulate organic carbon Greenland glacier stream radiocarbon permafrost |
spellingShingle |
particulate organic carbon Greenland glacier stream radiocarbon permafrost Bröder, Lisa Hirst, Catherine Opfergelt, Sophie Thomas, Maxime Vonk, J. E. Haghipour, N. Eglinton, T. I. Fouché, J. Contrasting Export of Particulate Organic Carbon From Greenlandic Glacial and Nonglacial Streams |
topic_facet |
particulate organic carbon Greenland glacier stream radiocarbon permafrost |
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. |
author2 |
Swiss Federal Institute of Technology (ETH) - Geological Institute, Department of Earth Sciences UCL - SST/ELI/ELIE - Environmental Sciences |
format |
Article in Journal/Newspaper |
author |
Bröder, Lisa Hirst, Catherine Opfergelt, Sophie Thomas, Maxime Vonk, J. E. Haghipour, N. Eglinton, T. I. Fouché, J. |
author_facet |
Bröder, Lisa Hirst, Catherine Opfergelt, Sophie Thomas, Maxime Vonk, J. E. Haghipour, N. Eglinton, T. I. Fouché, J. |
author_sort |
Bröder, Lisa |
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 (AGU) |
publishDate |
2022 |
url |
http://hdl.handle.net/2078.1/267042 https://doi.org/10.1029/2022gl101210 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
glacier Greenland greenlandic permafrost Zackenberg |
genre_facet |
glacier Greenland greenlandic permafrost Zackenberg |
op_source |
Geophysical Research Letters, Vol. 49, no.21, p. 1 (2022) |
op_relation |
info:eu-repo/grantAgreement/INTERACT/European Union H2020/Grant 871120 info:eu-repo/grantAgreement/ERC/European Union's Horizon 2020 research and innovation programme/WeThaw info:eu-repo/grantAgreement/ERC/European Union's Horizon 2020 research and innovation programme/Thawsome boreal:267042 http://hdl.handle.net/2078.1/267042 doi:10.1029/2022gl101210 urn:ISSN:0094-8276 urn:EISSN:1944-8007 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2022gl101210 |
container_title |
Geophysical Research Letters |
container_volume |
49 |
container_issue |
21 |
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1798846135267229696 |