Shallow and deep groundwater moderate methane dynamics in a high Arctic glacial catchment
Glacial groundwater can mobilize deep-seated methane from beneath glaciers and permafrost in the Arctic, leading to atmospheric emissions of this greenhouse gas. We present a temporal, hydro-chemical dataset of methane-rich groundwater collected during two melt seasons from a high Arctic glacial for...
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Online Access: | https://hdl.handle.net/11250/3130079 https://doi.org/10.3389/feart.2024.1340399 |
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ftunivbergen:oai:bora.uib.no:11250/3130079 2024-06-09T07:43:37+00:00 Shallow and deep groundwater moderate methane dynamics in a high Arctic glacial catchment Kleber, Gabrielle Emma Magerl, Leonard Turchyn, Alexandra V. Redeker, Kelly Thiele, Stefan Liira, Martin Herodes, Koit Øvreas, Lise Hodson, Andrew 2024 application/pdf https://hdl.handle.net/11250/3130079 https://doi.org/10.3389/feart.2024.1340399 eng eng Frontiers Norges forskningsråd: 329174 Norges forskningsråd: 294764 urn:issn:2296-6463 https://hdl.handle.net/11250/3130079 https://doi.org/10.3389/feart.2024.1340399 cristin:2243917 Frontiers in Earth Science. 2024, 12, 1340399. Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2024 The Author(s) 1340399 Frontiers in Earth Science 12 Journal article Peer reviewed 2024 ftunivbergen https://doi.org/10.3389/feart.2024.1340399 2024-05-14T23:30:34Z Glacial groundwater can mobilize deep-seated methane from beneath glaciers and permafrost in the Arctic, leading to atmospheric emissions of this greenhouse gas. We present a temporal, hydro-chemical dataset of methane-rich groundwater collected during two melt seasons from a high Arctic glacial forefield to explore the seasonal dynamics of methane emissions. We use methane and ion concentrations and the isotopic composition of water and methane to investigate the sources of groundwater and the origin of the methane that the groundwater transports to the surface. Our results suggest two sources of groundwater, one shallow and one deep, which mix, and moderate methane dynamics. During summer, deep methane-rich groundwater is diluted by shallow oxygenated groundwater, leading to some microbial methane oxidation prior to its emergence at the surface. Characterization of the microbial compositions in the groundwater shows that microbial activity is an important seasonal methane sink along this flow-path. In the groundwater pool studied, we found that potential methane emissions were reduced by an average of 29% (±14%) throughout the summer due to microbial oxidation. During winter, deep groundwater remains active while many shallow systems shut down due to freezing, reducing subsurface methane oxidation, and potentially permitting larger methane emissions. Our results suggest that ratios of the different groundwater sources will change in the future as aquifer capacities and recharge volumes increase in a warming climate publishedVersion Article in Journal/Newspaper Arctic permafrost University of Bergen: Bergen Open Research Archive (BORA-UiB) Arctic Frontiers in Earth Science 12 |
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Open Polar |
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University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
Glacial groundwater can mobilize deep-seated methane from beneath glaciers and permafrost in the Arctic, leading to atmospheric emissions of this greenhouse gas. We present a temporal, hydro-chemical dataset of methane-rich groundwater collected during two melt seasons from a high Arctic glacial forefield to explore the seasonal dynamics of methane emissions. We use methane and ion concentrations and the isotopic composition of water and methane to investigate the sources of groundwater and the origin of the methane that the groundwater transports to the surface. Our results suggest two sources of groundwater, one shallow and one deep, which mix, and moderate methane dynamics. During summer, deep methane-rich groundwater is diluted by shallow oxygenated groundwater, leading to some microbial methane oxidation prior to its emergence at the surface. Characterization of the microbial compositions in the groundwater shows that microbial activity is an important seasonal methane sink along this flow-path. In the groundwater pool studied, we found that potential methane emissions were reduced by an average of 29% (±14%) throughout the summer due to microbial oxidation. During winter, deep groundwater remains active while many shallow systems shut down due to freezing, reducing subsurface methane oxidation, and potentially permitting larger methane emissions. Our results suggest that ratios of the different groundwater sources will change in the future as aquifer capacities and recharge volumes increase in a warming climate publishedVersion |
format |
Article in Journal/Newspaper |
author |
Kleber, Gabrielle Emma Magerl, Leonard Turchyn, Alexandra V. Redeker, Kelly Thiele, Stefan Liira, Martin Herodes, Koit Øvreas, Lise Hodson, Andrew |
spellingShingle |
Kleber, Gabrielle Emma Magerl, Leonard Turchyn, Alexandra V. Redeker, Kelly Thiele, Stefan Liira, Martin Herodes, Koit Øvreas, Lise Hodson, Andrew Shallow and deep groundwater moderate methane dynamics in a high Arctic glacial catchment |
author_facet |
Kleber, Gabrielle Emma Magerl, Leonard Turchyn, Alexandra V. Redeker, Kelly Thiele, Stefan Liira, Martin Herodes, Koit Øvreas, Lise Hodson, Andrew |
author_sort |
Kleber, Gabrielle Emma |
title |
Shallow and deep groundwater moderate methane dynamics in a high Arctic glacial catchment |
title_short |
Shallow and deep groundwater moderate methane dynamics in a high Arctic glacial catchment |
title_full |
Shallow and deep groundwater moderate methane dynamics in a high Arctic glacial catchment |
title_fullStr |
Shallow and deep groundwater moderate methane dynamics in a high Arctic glacial catchment |
title_full_unstemmed |
Shallow and deep groundwater moderate methane dynamics in a high Arctic glacial catchment |
title_sort |
shallow and deep groundwater moderate methane dynamics in a high arctic glacial catchment |
publisher |
Frontiers |
publishDate |
2024 |
url |
https://hdl.handle.net/11250/3130079 https://doi.org/10.3389/feart.2024.1340399 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic permafrost |
genre_facet |
Arctic permafrost |
op_source |
1340399 Frontiers in Earth Science 12 |
op_relation |
Norges forskningsråd: 329174 Norges forskningsråd: 294764 urn:issn:2296-6463 https://hdl.handle.net/11250/3130079 https://doi.org/10.3389/feart.2024.1340399 cristin:2243917 Frontiers in Earth Science. 2024, 12, 1340399. |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2024 The Author(s) |
op_doi |
https://doi.org/10.3389/feart.2024.1340399 |
container_title |
Frontiers in Earth Science |
container_volume |
12 |
_version_ |
1801372482289008640 |