Methane emissions from subglacial meltwater of three alpine glaciers in Yukon, Canada
Subglacial meltwater of land-terminating glaciers in Greenland and Iceland are sources of methane (CH4) to the atmosphere, but sparse empirical data exist about the spatial distribution of subglacial CH4 production and emission from glaciers in other regions of the world. This study presents the fir...
Published in: | Arctic, Antarctic, and Alpine Research |
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2023
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Online Access: | https://curis.ku.dk/portal/da/publications/methane-emissions-from-subglacial-meltwater-of-three-alpine-glaciers-in-yukon-canada(ff7a47e5-cfa8-411b-9ca2-9a9aa3d3296c).html https://doi.org/10.1080/15230430.2023.2284456 https://curis.ku.dk/ws/files/375878999/Methane_emissions_from_subglacial_meltwater_of_three_alpine_glaciers_in_Yukon_Canada_1_.pdf |
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ftcopenhagenunip:oai:pure.atira.dk:publications/ff7a47e5-cfa8-411b-9ca2-9a9aa3d3296c 2024-05-19T07:32:42+00:00 Methane emissions from subglacial meltwater of three alpine glaciers in Yukon, Canada Sapper, Sarah Elise Jørgensen, Christian Juncher Schroll, Moritz Keppler, Frank Christiansen, Jesper Riis 2023 application/pdf https://curis.ku.dk/portal/da/publications/methane-emissions-from-subglacial-meltwater-of-three-alpine-glaciers-in-yukon-canada(ff7a47e5-cfa8-411b-9ca2-9a9aa3d3296c).html https://doi.org/10.1080/15230430.2023.2284456 https://curis.ku.dk/ws/files/375878999/Methane_emissions_from_subglacial_meltwater_of_three_alpine_glaciers_in_Yukon_Canada_1_.pdf eng eng info:eu-repo/semantics/openAccess Sapper , S E , Jørgensen , C J , Schroll , M , Keppler , F & Christiansen , J R 2023 , ' Methane emissions from subglacial meltwater of three alpine glaciers in Yukon, Canada ' , Arctic, Antarctic, and Alpine Research , vol. 55 , no. 1 , 2284456 . https://doi.org/10.1080/15230430.2023.2284456 article 2023 ftcopenhagenunip https://doi.org/10.1080/15230430.2023.2284456 2024-05-02T00:33:24Z Subglacial meltwater of land-terminating glaciers in Greenland and Iceland are sources of methane (CH4) to the atmosphere, but sparse empirical data exist about the spatial distribution of subglacial CH4 production and emission from glaciers in other regions of the world. This study presents the first measurements of CH4 emissions from the subglacial meltwater of three outlet glaciers of the St. Elias Mountains in Yukon, Canada. Dissolved CH4 concentrations were highly elevated at 45, 135, and 250 times compared to the atmospheric equilibrium concentration in the meltwater of Dusty, Kluane, and Donjek glaciers, respectively. Dissolved CO2 concentrations were depleted relative to the atmospheric equilibrium. This points to the meltwater being a source of CH4 and a sink of CO2. Stable carbon (13C) and hydrogen (2H) isotopic signatures of the subglacial CH4 were depleted compared to atmospheric CH4 at all sites, indicating both biotic and abiotic sources and possible alteration from bacterial CH4 oxidation in the meltwater. No relation was found between CH4 concentrations in the meltwater and the meltwater chemistry or the size of the glaciers in this study. These findings suggest that CH4 emissions from subglacial environments under alpine glaciers may be a more common phenomenon than previously thought. Article in Journal/Newspaper Antarctic and Alpine Research Arctic glacier* Greenland Iceland Yukon University of Copenhagen: Research Arctic, Antarctic, and Alpine Research 55 1 |
institution |
Open Polar |
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University of Copenhagen: Research |
op_collection_id |
ftcopenhagenunip |
language |
English |
description |
Subglacial meltwater of land-terminating glaciers in Greenland and Iceland are sources of methane (CH4) to the atmosphere, but sparse empirical data exist about the spatial distribution of subglacial CH4 production and emission from glaciers in other regions of the world. This study presents the first measurements of CH4 emissions from the subglacial meltwater of three outlet glaciers of the St. Elias Mountains in Yukon, Canada. Dissolved CH4 concentrations were highly elevated at 45, 135, and 250 times compared to the atmospheric equilibrium concentration in the meltwater of Dusty, Kluane, and Donjek glaciers, respectively. Dissolved CO2 concentrations were depleted relative to the atmospheric equilibrium. This points to the meltwater being a source of CH4 and a sink of CO2. Stable carbon (13C) and hydrogen (2H) isotopic signatures of the subglacial CH4 were depleted compared to atmospheric CH4 at all sites, indicating both biotic and abiotic sources and possible alteration from bacterial CH4 oxidation in the meltwater. No relation was found between CH4 concentrations in the meltwater and the meltwater chemistry or the size of the glaciers in this study. These findings suggest that CH4 emissions from subglacial environments under alpine glaciers may be a more common phenomenon than previously thought. |
format |
Article in Journal/Newspaper |
author |
Sapper, Sarah Elise Jørgensen, Christian Juncher Schroll, Moritz Keppler, Frank Christiansen, Jesper Riis |
spellingShingle |
Sapper, Sarah Elise Jørgensen, Christian Juncher Schroll, Moritz Keppler, Frank Christiansen, Jesper Riis Methane emissions from subglacial meltwater of three alpine glaciers in Yukon, Canada |
author_facet |
Sapper, Sarah Elise Jørgensen, Christian Juncher Schroll, Moritz Keppler, Frank Christiansen, Jesper Riis |
author_sort |
Sapper, Sarah Elise |
title |
Methane emissions from subglacial meltwater of three alpine glaciers in Yukon, Canada |
title_short |
Methane emissions from subglacial meltwater of three alpine glaciers in Yukon, Canada |
title_full |
Methane emissions from subglacial meltwater of three alpine glaciers in Yukon, Canada |
title_fullStr |
Methane emissions from subglacial meltwater of three alpine glaciers in Yukon, Canada |
title_full_unstemmed |
Methane emissions from subglacial meltwater of three alpine glaciers in Yukon, Canada |
title_sort |
methane emissions from subglacial meltwater of three alpine glaciers in yukon, canada |
publishDate |
2023 |
url |
https://curis.ku.dk/portal/da/publications/methane-emissions-from-subglacial-meltwater-of-three-alpine-glaciers-in-yukon-canada(ff7a47e5-cfa8-411b-9ca2-9a9aa3d3296c).html https://doi.org/10.1080/15230430.2023.2284456 https://curis.ku.dk/ws/files/375878999/Methane_emissions_from_subglacial_meltwater_of_three_alpine_glaciers_in_Yukon_Canada_1_.pdf |
genre |
Antarctic and Alpine Research Arctic glacier* Greenland Iceland Yukon |
genre_facet |
Antarctic and Alpine Research Arctic glacier* Greenland Iceland Yukon |
op_source |
Sapper , S E , Jørgensen , C J , Schroll , M , Keppler , F & Christiansen , J R 2023 , ' Methane emissions from subglacial meltwater of three alpine glaciers in Yukon, Canada ' , Arctic, Antarctic, and Alpine Research , vol. 55 , no. 1 , 2284456 . https://doi.org/10.1080/15230430.2023.2284456 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1080/15230430.2023.2284456 |
container_title |
Arctic, Antarctic, and Alpine Research |
container_volume |
55 |
container_issue |
1 |
_version_ |
1799470860915965952 |