An Abrupt Aging of Dissolved Organic Carbon in Large Arctic Rivers
Permafrost thaw in Arctic watersheds threatens to mobilize hitherto sequestered carbon. We examine the radiocarbon activity (F14C) of dissolved organic carbon (DOC) in the northern Mackenzie River basin. From 2003-2017, DOC-F14C signatures (1.00 ± 0.04; n=39) tracked atmospheric 14CO2, indicating ex...
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ftethz:oai:www.research-collection.ethz.ch:20.500.11850/455335 2023-05-15T14:55:11+02:00 An Abrupt Aging of Dissolved Organic Carbon in Large Arctic Rivers Schwab, Melissa S. Hilton, Robert G. Raymond, Peter A. Haghipour, Negar Amos, Edwin Tank, Suzanne E. Holmes, Robert M. Tipper, Edward T. Eglinton, Timothy I. 2020-12-16 application/application/pdf https://hdl.handle.net/20.500.11850/455335 https://doi.org/10.3929/ethz-b-000455335 en eng American Geophysical Union (AGU) info:eu-repo/semantics/altIdentifier/doi/10.1029/2020gl088823 info:eu-repo/semantics/altIdentifier/wos/000598677000011 info:eu-repo/grantAgreement/SNF/Projekte MINT/163162 info:eu-repo/grantAgreement/SNF/Projekte MINT/184865 http://hdl.handle.net/20.500.11850/455335 doi:10.3929/ethz-b-000455335 info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International CC-BY Geophysical Research Letters, 47 (23) dissolved organic carbon Mackenzie River permafrost discharge warming info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2020 ftethz https://doi.org/20.500.11850/455335 https://doi.org/10.3929/ethz-b-000455335 https://doi.org/10.1029/2020gl088823 2023-02-13T00:53:34Z Permafrost thaw in Arctic watersheds threatens to mobilize hitherto sequestered carbon. We examine the radiocarbon activity (F14C) of dissolved organic carbon (DOC) in the northern Mackenzie River basin. From 2003-2017, DOC-F14C signatures (1.00 ± 0.04; n=39) tracked atmospheric 14CO2, indicating export of “modern” carbon. This trend was interrupted in June 2018 by the widespread release of aged DOC (0.85 ± 0.16, n = 28) measured across three separate catchment areas. Increased nitrate concentrations in June 2018 lead us to attribute this pulse of 14C-depleted DOC to mobilization of previously frozen soil organic matter. We propose export through lateral perennial thaw zones occurred at the base of the active layer weakened by preceding warm summer and winter seasons. Although we are not yet able to ascertain the broader significance of this “anomalous” mobilization event, it highlights the potential for rapid and large-scale release of aged carbon from permafrost. ISSN:0094-8276 ISSN:1944-8007 Article in Journal/Newspaper Arctic Mackenzie river permafrost ETH Zürich Research Collection Arctic Mackenzie River |
institution |
Open Polar |
collection |
ETH Zürich Research Collection |
op_collection_id |
ftethz |
language |
English |
topic |
dissolved organic carbon Mackenzie River permafrost discharge warming |
spellingShingle |
dissolved organic carbon Mackenzie River permafrost discharge warming Schwab, Melissa S. Hilton, Robert G. Raymond, Peter A. Haghipour, Negar Amos, Edwin Tank, Suzanne E. Holmes, Robert M. Tipper, Edward T. Eglinton, Timothy I. An Abrupt Aging of Dissolved Organic Carbon in Large Arctic Rivers |
topic_facet |
dissolved organic carbon Mackenzie River permafrost discharge warming |
description |
Permafrost thaw in Arctic watersheds threatens to mobilize hitherto sequestered carbon. We examine the radiocarbon activity (F14C) of dissolved organic carbon (DOC) in the northern Mackenzie River basin. From 2003-2017, DOC-F14C signatures (1.00 ± 0.04; n=39) tracked atmospheric 14CO2, indicating export of “modern” carbon. This trend was interrupted in June 2018 by the widespread release of aged DOC (0.85 ± 0.16, n = 28) measured across three separate catchment areas. Increased nitrate concentrations in June 2018 lead us to attribute this pulse of 14C-depleted DOC to mobilization of previously frozen soil organic matter. We propose export through lateral perennial thaw zones occurred at the base of the active layer weakened by preceding warm summer and winter seasons. Although we are not yet able to ascertain the broader significance of this “anomalous” mobilization event, it highlights the potential for rapid and large-scale release of aged carbon from permafrost. ISSN:0094-8276 ISSN:1944-8007 |
format |
Article in Journal/Newspaper |
author |
Schwab, Melissa S. Hilton, Robert G. Raymond, Peter A. Haghipour, Negar Amos, Edwin Tank, Suzanne E. Holmes, Robert M. Tipper, Edward T. Eglinton, Timothy I. |
author_facet |
Schwab, Melissa S. Hilton, Robert G. Raymond, Peter A. Haghipour, Negar Amos, Edwin Tank, Suzanne E. Holmes, Robert M. Tipper, Edward T. Eglinton, Timothy I. |
author_sort |
Schwab, Melissa S. |
title |
An Abrupt Aging of Dissolved Organic Carbon in Large Arctic Rivers |
title_short |
An Abrupt Aging of Dissolved Organic Carbon in Large Arctic Rivers |
title_full |
An Abrupt Aging of Dissolved Organic Carbon in Large Arctic Rivers |
title_fullStr |
An Abrupt Aging of Dissolved Organic Carbon in Large Arctic Rivers |
title_full_unstemmed |
An Abrupt Aging of Dissolved Organic Carbon in Large Arctic Rivers |
title_sort |
abrupt aging of dissolved organic carbon in large arctic rivers |
publisher |
American Geophysical Union (AGU) |
publishDate |
2020 |
url |
https://hdl.handle.net/20.500.11850/455335 https://doi.org/10.3929/ethz-b-000455335 |
geographic |
Arctic Mackenzie River |
geographic_facet |
Arctic Mackenzie River |
genre |
Arctic Mackenzie river permafrost |
genre_facet |
Arctic Mackenzie river permafrost |
op_source |
Geophysical Research Letters, 47 (23) |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2020gl088823 info:eu-repo/semantics/altIdentifier/wos/000598677000011 info:eu-repo/grantAgreement/SNF/Projekte MINT/163162 info:eu-repo/grantAgreement/SNF/Projekte MINT/184865 http://hdl.handle.net/20.500.11850/455335 doi:10.3929/ethz-b-000455335 |
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/20.500.11850/455335 https://doi.org/10.3929/ethz-b-000455335 https://doi.org/10.1029/2020gl088823 |
_version_ |
1766326971239759872 |