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...
Main Authors: | , , , , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Geophysical Union (AGU)
2020
|
Subjects: | |
Online Access: | https://dx.doi.org/10.17863/cam.62261 https://www.repository.cam.ac.uk/handle/1810/315156 |
id |
ftdatacite:10.17863/cam.62261 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.17863/cam.62261 2024-02-27T08:37:40+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 https://dx.doi.org/10.17863/cam.62261 https://www.repository.cam.ac.uk/handle/1810/315156 en eng American Geophysical Union (AGU) open.access Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 http://purl.org/coar/access_right/c_abf2 Mackenzie River discharge dissolved organic carbon permafrost warming article-journal ScholarlyArticle JournalArticle Article 2020 ftdatacite https://doi.org/10.17863/cam.62261 2024-02-01T14:52:59Z 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 that 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. ... Article in Journal/Newspaper Arctic Mackenzie river permafrost DataCite Metadata Store (German National Library of Science and Technology) Arctic Mackenzie River |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Mackenzie River discharge dissolved organic carbon permafrost warming |
spellingShingle |
Mackenzie River discharge dissolved organic carbon permafrost 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 |
Mackenzie River discharge dissolved organic carbon permafrost 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 that 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. ... |
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://dx.doi.org/10.17863/cam.62261 https://www.repository.cam.ac.uk/handle/1810/315156 |
geographic |
Arctic Mackenzie River |
geographic_facet |
Arctic Mackenzie River |
genre |
Arctic Mackenzie river permafrost |
genre_facet |
Arctic Mackenzie river permafrost |
op_rights |
open.access Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 http://purl.org/coar/access_right/c_abf2 |
op_doi |
https://doi.org/10.17863/cam.62261 |
_version_ |
1792044643233300480 |