Characterization of atmospheric methane release in the outer Mackenzie River delta from biogenic and thermogenic sources
The Mackenzie River delta is the second largest Arctic river delta in the world. Thin and destabilizing permafrost coupled with vast natural gas reserves at depth, high organic-content soils, and a high proportion of wetlands create a unique ecosystem conducive to high rates of methane (CH4) emissio...
Published in: | The Cryosphere |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Copernicus Publications
2023
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Online Access: | https://doi.org/10.5194/tc-17-5283-2023 https://noa.gwlb.de/receive/cop_mods_00070425 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00068774/tc-17-5283-2023.pdf https://tc.copernicus.org/articles/17/5283/2023/tc-17-5283-2023.pdf |
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00070425 2024-01-14T10:04:52+01:00 Characterization of atmospheric methane release in the outer Mackenzie River delta from biogenic and thermogenic sources Wesley, Daniel Dallimore, Scott MacLeod, Roger Sachs, Torsten Risk, David 2023-12 electronic https://doi.org/10.5194/tc-17-5283-2023 https://noa.gwlb.de/receive/cop_mods_00070425 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00068774/tc-17-5283-2023.pdf https://tc.copernicus.org/articles/17/5283/2023/tc-17-5283-2023.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-17-5283-2023 https://noa.gwlb.de/receive/cop_mods_00070425 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00068774/tc-17-5283-2023.pdf https://tc.copernicus.org/articles/17/5283/2023/tc-17-5283-2023.pdf https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2023 ftnonlinearchiv https://doi.org/10.5194/tc-17-5283-2023 2023-12-18T00:22:46Z The Mackenzie River delta is the second largest Arctic river delta in the world. Thin and destabilizing permafrost coupled with vast natural gas reserves at depth, high organic-content soils, and a high proportion of wetlands create a unique ecosystem conducive to high rates of methane (CH4) emission from biogenic and thermogenic sources. Hotspots are known to have a significant contribution to summertime CH4 emissions in the region. Still, little research has been done to determine how often geologic or biogenic CH4 contributes to hotspots in the Mackenzie River delta. In the present study, stable carbon isotope analysis was used to identify the source of CH4 at several aquatic and terrestrial sites thought to be hotspots of CH4 flux to the atmosphere. Walking transects and point samples of atmospheric CH4 and CO2 concentrations were measured. Source stable carbon isotope (δ13C-CH4) signatures were derived from keeling plots of point samples and ranged from −42 ‰ to −88 ‰ δ13C-CH4, identifying both biogenic and thermogenic sources. A CH4 source was determined for eight hotspots, two of which were thermogenic in origin (−42.5 ‰, −44.7 ‰), four of which were biogenic in origin (−71.9 ‰ to −88.3 ‰), and two of which may have been produced by the oxidation of biogenic CH4 (−53.0 ‰, −63.6 ‰), as evidenced by δ13C-CH4 signatures. This indicates that the largest hotspots of CH4 production in the Mackenzie River delta are caused by a variety of sources. Article in Journal/Newspaper Arctic Mackenzie river permafrost The Cryosphere Niedersächsisches Online-Archiv NOA Arctic Mackenzie River The Cryosphere 17 12 5283 5297 |
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Niedersächsisches Online-Archiv NOA |
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ftnonlinearchiv |
language |
English |
topic |
article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Wesley, Daniel Dallimore, Scott MacLeod, Roger Sachs, Torsten Risk, David Characterization of atmospheric methane release in the outer Mackenzie River delta from biogenic and thermogenic sources |
topic_facet |
article Verlagsveröffentlichung |
description |
The Mackenzie River delta is the second largest Arctic river delta in the world. Thin and destabilizing permafrost coupled with vast natural gas reserves at depth, high organic-content soils, and a high proportion of wetlands create a unique ecosystem conducive to high rates of methane (CH4) emission from biogenic and thermogenic sources. Hotspots are known to have a significant contribution to summertime CH4 emissions in the region. Still, little research has been done to determine how often geologic or biogenic CH4 contributes to hotspots in the Mackenzie River delta. In the present study, stable carbon isotope analysis was used to identify the source of CH4 at several aquatic and terrestrial sites thought to be hotspots of CH4 flux to the atmosphere. Walking transects and point samples of atmospheric CH4 and CO2 concentrations were measured. Source stable carbon isotope (δ13C-CH4) signatures were derived from keeling plots of point samples and ranged from −42 ‰ to −88 ‰ δ13C-CH4, identifying both biogenic and thermogenic sources. A CH4 source was determined for eight hotspots, two of which were thermogenic in origin (−42.5 ‰, −44.7 ‰), four of which were biogenic in origin (−71.9 ‰ to −88.3 ‰), and two of which may have been produced by the oxidation of biogenic CH4 (−53.0 ‰, −63.6 ‰), as evidenced by δ13C-CH4 signatures. This indicates that the largest hotspots of CH4 production in the Mackenzie River delta are caused by a variety of sources. |
format |
Article in Journal/Newspaper |
author |
Wesley, Daniel Dallimore, Scott MacLeod, Roger Sachs, Torsten Risk, David |
author_facet |
Wesley, Daniel Dallimore, Scott MacLeod, Roger Sachs, Torsten Risk, David |
author_sort |
Wesley, Daniel |
title |
Characterization of atmospheric methane release in the outer Mackenzie River delta from biogenic and thermogenic sources |
title_short |
Characterization of atmospheric methane release in the outer Mackenzie River delta from biogenic and thermogenic sources |
title_full |
Characterization of atmospheric methane release in the outer Mackenzie River delta from biogenic and thermogenic sources |
title_fullStr |
Characterization of atmospheric methane release in the outer Mackenzie River delta from biogenic and thermogenic sources |
title_full_unstemmed |
Characterization of atmospheric methane release in the outer Mackenzie River delta from biogenic and thermogenic sources |
title_sort |
characterization of atmospheric methane release in the outer mackenzie river delta from biogenic and thermogenic sources |
publisher |
Copernicus Publications |
publishDate |
2023 |
url |
https://doi.org/10.5194/tc-17-5283-2023 https://noa.gwlb.de/receive/cop_mods_00070425 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00068774/tc-17-5283-2023.pdf https://tc.copernicus.org/articles/17/5283/2023/tc-17-5283-2023.pdf |
geographic |
Arctic Mackenzie River |
geographic_facet |
Arctic Mackenzie River |
genre |
Arctic Mackenzie river permafrost The Cryosphere |
genre_facet |
Arctic Mackenzie river permafrost The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-17-5283-2023 https://noa.gwlb.de/receive/cop_mods_00070425 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00068774/tc-17-5283-2023.pdf https://tc.copernicus.org/articles/17/5283/2023/tc-17-5283-2023.pdf |
op_rights |
https://creativecommons.org/licenses/by/4.0/ uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-17-5283-2023 |
container_title |
The Cryosphere |
container_volume |
17 |
container_issue |
12 |
container_start_page |
5283 |
op_container_end_page |
5297 |
_version_ |
1788059308084166656 |