Gas dynamics within landfast sea ice of an Arctic fjord (NE Greenland) during the spring–summer transition
peer reviewed Sea ice is an active component of the Earth’s climate system, interacting with both the atmosphere and the ocean. Arctic sea ice is commonly covered by melt ponds during late spring and summer, strongly affecting sea ice physical and optical properties. How melt pond formation affects...
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Language: | English |
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University of California Press
2023
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Online Access: | https://orbi.uliege.be/handle/2268/302216 https://orbi.uliege.be/bitstream/2268/302216/1/elementa.2022.00056.pdf https://doi.org/10.1525/elementa.2022.00056 |
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ftorbi:oai:orbi.ulg.ac.be:2268/302216 2024-04-21T08:03:44+00:00 Gas dynamics within landfast sea ice of an Arctic fjord (NE Greenland) during the spring–summer transition Geilfus, Nicolas-Xavier Delille, Bruno Tison, Jean-Louis Lemes, Marcos Rysgaard, Søren FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège 2023 https://orbi.uliege.be/handle/2268/302216 https://orbi.uliege.be/bitstream/2268/302216/1/elementa.2022.00056.pdf https://doi.org/10.1525/elementa.2022.00056 en eng University of California Press https://online.ucpress.edu/elementa/article-pdf/doi/10.1525/elementa.2022.00056/777184/elementa.2022.00056.pdf urn:issn:2325-1026 https://orbi.uliege.be/handle/2268/302216 info:hdl:2268/302216 https://orbi.uliege.be/bitstream/2268/302216/1/elementa.2022.00056.pdf doi:10.1525/elementa.2022.00056 scopus-id:2-s2.0-85159258095 open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess Elementa: Science of the Anthropocene, 11 (1) (2023) Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique journal article http://purl.org/coar/resource_type/c_6501 info:eu-repo/semantics/article peer reviewed 2023 ftorbi https://doi.org/10.1525/elementa.2022.00056 2024-03-27T14:59:50Z peer reviewed Sea ice is an active component of the Earth’s climate system, interacting with both the atmosphere and the ocean. Arctic sea ice is commonly covered by melt ponds during late spring and summer, strongly affecting sea ice physical and optical properties. How melt pond formation affects sea ice gas dynamics and exchanges between sea ice and the atmosphere, with potential feedbacks on climate, is not well known. Here we measured concentrations of N2, O2, and Ar, total alkalinity, and dissolved inorganic carbon within sea ice of Young Sound, NE Greenland, to examine how melt pond formation and meltwater drainage through the ice affect its physical properties and gas composition, including impacts on CO2 exchange with the atmosphere. Sea ice gas composition was controlled mainly by physical processes, with most of the gas initially in gaseous form in the upper ice layer. A minor contribution from biological processes was associated with positive estimates of net community production (up to 2.6 µmol Lice−1 d−1), indicating that the ice was net autotrophic. As the sea ice warmed, the upper ice gas concentrations decreased, suggesting a release of gas bubbles to the atmosphere. However, as melt ponds formed, the ice surface became strongly depleted in gases. Due to melt pond development, meltwater permeated through the ice, resulting in the formation of an underwater ice layer also depleted in gases. Sea ice, including brine, slush, and melt ponds, was undersaturated in CO2 compared to the atmosphere, supporting an uptake of up to −4.26 mmol m−2 d−1 of atmospheric CO2. As melt pond formation progressed, however, this uptake weakened in the strongly altered remaining ice surface (the “white ice”), averaging −0.04 mmol m−2 d−1. This study reveals the importance of melt pond formation and dynamics for sea ice gas composition. Article in Journal/Newspaper Greenland Sea ice University of Liège: ORBi (Open Repository and Bibliography) Elem Sci Anth 11 1 |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Geilfus, Nicolas-Xavier Delille, Bruno Tison, Jean-Louis Lemes, Marcos Rysgaard, Søren Gas dynamics within landfast sea ice of an Arctic fjord (NE Greenland) during the spring–summer transition |
topic_facet |
Atmospheric Science Geology Geotechnical Engineering and Engineering Geology Ecology Environmental Engineering Oceanography Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
description |
peer reviewed Sea ice is an active component of the Earth’s climate system, interacting with both the atmosphere and the ocean. Arctic sea ice is commonly covered by melt ponds during late spring and summer, strongly affecting sea ice physical and optical properties. How melt pond formation affects sea ice gas dynamics and exchanges between sea ice and the atmosphere, with potential feedbacks on climate, is not well known. Here we measured concentrations of N2, O2, and Ar, total alkalinity, and dissolved inorganic carbon within sea ice of Young Sound, NE Greenland, to examine how melt pond formation and meltwater drainage through the ice affect its physical properties and gas composition, including impacts on CO2 exchange with the atmosphere. Sea ice gas composition was controlled mainly by physical processes, with most of the gas initially in gaseous form in the upper ice layer. A minor contribution from biological processes was associated with positive estimates of net community production (up to 2.6 µmol Lice−1 d−1), indicating that the ice was net autotrophic. As the sea ice warmed, the upper ice gas concentrations decreased, suggesting a release of gas bubbles to the atmosphere. However, as melt ponds formed, the ice surface became strongly depleted in gases. Due to melt pond development, meltwater permeated through the ice, resulting in the formation of an underwater ice layer also depleted in gases. Sea ice, including brine, slush, and melt ponds, was undersaturated in CO2 compared to the atmosphere, supporting an uptake of up to −4.26 mmol m−2 d−1 of atmospheric CO2. As melt pond formation progressed, however, this uptake weakened in the strongly altered remaining ice surface (the “white ice”), averaging −0.04 mmol m−2 d−1. This study reveals the importance of melt pond formation and dynamics for sea ice gas composition. |
author2 |
FOCUS - Freshwater and OCeanic science Unit of reSearch - ULiège |
format |
Article in Journal/Newspaper |
author |
Geilfus, Nicolas-Xavier Delille, Bruno Tison, Jean-Louis Lemes, Marcos Rysgaard, Søren |
author_facet |
Geilfus, Nicolas-Xavier Delille, Bruno Tison, Jean-Louis Lemes, Marcos Rysgaard, Søren |
author_sort |
Geilfus, Nicolas-Xavier |
title |
Gas dynamics within landfast sea ice of an Arctic fjord (NE Greenland) during the spring–summer transition |
title_short |
Gas dynamics within landfast sea ice of an Arctic fjord (NE Greenland) during the spring–summer transition |
title_full |
Gas dynamics within landfast sea ice of an Arctic fjord (NE Greenland) during the spring–summer transition |
title_fullStr |
Gas dynamics within landfast sea ice of an Arctic fjord (NE Greenland) during the spring–summer transition |
title_full_unstemmed |
Gas dynamics within landfast sea ice of an Arctic fjord (NE Greenland) during the spring–summer transition |
title_sort |
gas dynamics within landfast sea ice of an arctic fjord (ne greenland) during the spring–summer transition |
publisher |
University of California Press |
publishDate |
2023 |
url |
https://orbi.uliege.be/handle/2268/302216 https://orbi.uliege.be/bitstream/2268/302216/1/elementa.2022.00056.pdf https://doi.org/10.1525/elementa.2022.00056 |
genre |
Greenland Sea ice |
genre_facet |
Greenland Sea ice |
op_source |
Elementa: Science of the Anthropocene, 11 (1) (2023) |
op_relation |
https://online.ucpress.edu/elementa/article-pdf/doi/10.1525/elementa.2022.00056/777184/elementa.2022.00056.pdf urn:issn:2325-1026 https://orbi.uliege.be/handle/2268/302216 info:hdl:2268/302216 https://orbi.uliege.be/bitstream/2268/302216/1/elementa.2022.00056.pdf doi:10.1525/elementa.2022.00056 scopus-id:2-s2.0-85159258095 |
op_rights |
open access http://purl.org/coar/access_right/c_abf2 info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1525/elementa.2022.00056 |
container_title |
Elem Sci Anth |
container_volume |
11 |
container_issue |
1 |
_version_ |
1796943471514222592 |