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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Online Access: | https://dx.doi.org/10.3929/ethz-b-000455335 http://hdl.handle.net/20.500.11850/455335 |
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ftdatacite:10.3929/ethz-b-000455335 2024-04-28T08:08:36+00:00 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 application/pdf https://dx.doi.org/10.3929/ethz-b-000455335 http://hdl.handle.net/20.500.11850/455335 en eng ETH Zurich info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 dissolved organic carbon Mackenzie River permafrost discharge warming article-journal Text ScholarlyArticle Journal Article 2020 ftdatacite https://doi.org/10.3929/ethz-b-000455335 2024-04-02T12:34:54Z 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. ... : Geophysical Research Letters, 47 (23) ... Article in Journal/Newspaper Arctic Mackenzie river permafrost DataCite Metadata Store (German National Library of Science and Technology) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
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. ... : Geophysical Research Letters, 47 (23) ... |
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 |
ETH Zurich |
publishDate |
2020 |
url |
https://dx.doi.org/10.3929/ethz-b-000455335 http://hdl.handle.net/20.500.11850/455335 |
genre |
Arctic Mackenzie river permafrost |
genre_facet |
Arctic Mackenzie river permafrost |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_doi |
https://doi.org/10.3929/ethz-b-000455335 |
_version_ |
1797577321809444864 |