Gas dynamics within landfast sea ice of an Arctic fjord (NE Greenland) during the spring- summer transition
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 g...
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2023
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ftuniaarhuspubl:oai:pure.atira.dk:publications/b74d6555-57ea-43fe-8e7a-3e39d3ec4765 2023-11-12T04:09:49+01:00 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 2023-04-27 https://pure.au.dk/portal/da/publications/gas-dynamics-within-landfast-sea-ice-of-an-arctic-fjord-ne-greenland-during-the-spring-summer-transition(b74d6555-57ea-43fe-8e7a-3e39d3ec4765).html https://doi.org/10.1525/elementa.2022.00056 http://www.scopus.com/inward/record.url?scp=85159258095&partnerID=8YFLogxK eng eng info:eu-repo/semantics/openAccess Geilfus , N X , Delille , B , Tison , J L , Lemes , M & Rysgaard , S 2023 , ' Gas dynamics within landfast sea ice of an Arctic fjord (NE Greenland) during the spring- summer transition ' , Elementa , vol. 11 , no. 1 , 00056 . https://doi.org/10.1525/elementa.2022.00056 Carbonate system CO Gas Melt ponds Sea ice article 2023 ftuniaarhuspubl https://doi.org/10.1525/elementa.2022.00056 2023-10-18T22:58:45Z 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 N 2 , O 2 , 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 CO 2 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 mmol L ice -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 CO 2 compared to the atmosphere, supporting an uptake of up to -4.26 mmol m -2 d -1 of atmospheric CO 2 . 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 Arctic Arctic Greenland Sea ice Aarhus University: Research Arctic Greenland Elem Sci Anth 11 1 |
institution |
Open Polar |
collection |
Aarhus University: Research |
op_collection_id |
ftuniaarhuspubl |
language |
English |
topic |
Carbonate system CO Gas Melt ponds Sea ice |
spellingShingle |
Carbonate system CO Gas Melt ponds Sea ice 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 |
Carbonate system CO Gas Melt ponds Sea ice |
description |
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 N 2 , O 2 , 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 CO 2 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 mmol L ice -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 CO 2 compared to the atmosphere, supporting an uptake of up to -4.26 mmol m -2 d -1 of atmospheric CO 2 . 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. |
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 |
publishDate |
2023 |
url |
https://pure.au.dk/portal/da/publications/gas-dynamics-within-landfast-sea-ice-of-an-arctic-fjord-ne-greenland-during-the-spring-summer-transition(b74d6555-57ea-43fe-8e7a-3e39d3ec4765).html https://doi.org/10.1525/elementa.2022.00056 http://www.scopus.com/inward/record.url?scp=85159258095&partnerID=8YFLogxK |
geographic |
Arctic Greenland |
geographic_facet |
Arctic Greenland |
genre |
Arctic Arctic Greenland Sea ice |
genre_facet |
Arctic Arctic Greenland Sea ice |
op_source |
Geilfus , N X , Delille , B , Tison , J L , Lemes , M & Rysgaard , S 2023 , ' Gas dynamics within landfast sea ice of an Arctic fjord (NE Greenland) during the spring- summer transition ' , Elementa , vol. 11 , no. 1 , 00056 . https://doi.org/10.1525/elementa.2022.00056 |
op_rights |
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_ |
1782329615405023232 |