Observations of brine plumes below melting Arctic sea ice
In sea ice, interconnected pockets and channels of brine are surrounded by fresh ice. Over time, brine is lost by gravity drainage and flushing. The timing of salt release and its interaction with the underlying water can impact subsequent sea ice melt. Turbulence measurements 1 m below melting sea...
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2018
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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00007267 2023-05-15T14:50:49+02:00 Observations of brine plumes below melting Arctic sea ice Peterson, Algot K. 2018-02 electronic https://doi.org/10.5194/os-14-127-2018 https://noa.gwlb.de/receive/cop_mods_00007267 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007224/os-14-127-2018.pdf https://os.copernicus.org/articles/14/127/2018/os-14-127-2018.pdf eng eng Copernicus Publications Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-14-127-2018 https://noa.gwlb.de/receive/cop_mods_00007267 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007224/os-14-127-2018.pdf https://os.copernicus.org/articles/14/127/2018/os-14-127-2018.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2018 ftnonlinearchiv https://doi.org/10.5194/os-14-127-2018 2022-02-08T22:58:37Z In sea ice, interconnected pockets and channels of brine are surrounded by fresh ice. Over time, brine is lost by gravity drainage and flushing. The timing of salt release and its interaction with the underlying water can impact subsequent sea ice melt. Turbulence measurements 1 m below melting sea ice north of Svalbard reveal anticorrelated heat and salt fluxes. From the observations, 131 salty plumes descending from the warm sea ice are identified, confirming previous observations from a Svalbard fjord. The plumes are likely triggered by oceanic heat through bottom melt. Calculated over a composite plume, oceanic heat and salt fluxes during the plumes account for 6 and 9 % of the total fluxes, respectively, while only lasting in total 0.5 % of the time. The observed salt flux accumulates to 7.6 kg m−2, indicating nearly full desalination of the ice. Bulk salinity reduction between two nearby ice cores agrees with accumulated salt fluxes to within a factor of 2. The increasing fraction of younger, more saline ice in the Arctic suggests an increase in desalination processes with the transition to the “new Arctic”. Article in Journal/Newspaper Arctic Sea ice Svalbard Niedersächsisches Online-Archiv NOA Arctic Svalbard Ocean Science 14 1 127 138 |
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English |
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article Verlagsveröffentlichung |
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article Verlagsveröffentlichung Peterson, Algot K. Observations of brine plumes below melting Arctic sea ice |
topic_facet |
article Verlagsveröffentlichung |
description |
In sea ice, interconnected pockets and channels of brine are surrounded by fresh ice. Over time, brine is lost by gravity drainage and flushing. The timing of salt release and its interaction with the underlying water can impact subsequent sea ice melt. Turbulence measurements 1 m below melting sea ice north of Svalbard reveal anticorrelated heat and salt fluxes. From the observations, 131 salty plumes descending from the warm sea ice are identified, confirming previous observations from a Svalbard fjord. The plumes are likely triggered by oceanic heat through bottom melt. Calculated over a composite plume, oceanic heat and salt fluxes during the plumes account for 6 and 9 % of the total fluxes, respectively, while only lasting in total 0.5 % of the time. The observed salt flux accumulates to 7.6 kg m−2, indicating nearly full desalination of the ice. Bulk salinity reduction between two nearby ice cores agrees with accumulated salt fluxes to within a factor of 2. The increasing fraction of younger, more saline ice in the Arctic suggests an increase in desalination processes with the transition to the “new Arctic”. |
format |
Article in Journal/Newspaper |
author |
Peterson, Algot K. |
author_facet |
Peterson, Algot K. |
author_sort |
Peterson, Algot K. |
title |
Observations of brine plumes below melting Arctic sea ice |
title_short |
Observations of brine plumes below melting Arctic sea ice |
title_full |
Observations of brine plumes below melting Arctic sea ice |
title_fullStr |
Observations of brine plumes below melting Arctic sea ice |
title_full_unstemmed |
Observations of brine plumes below melting Arctic sea ice |
title_sort |
observations of brine plumes below melting arctic sea ice |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/os-14-127-2018 https://noa.gwlb.de/receive/cop_mods_00007267 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007224/os-14-127-2018.pdf https://os.copernicus.org/articles/14/127/2018/os-14-127-2018.pdf |
geographic |
Arctic Svalbard |
geographic_facet |
Arctic Svalbard |
genre |
Arctic Sea ice Svalbard |
genre_facet |
Arctic Sea ice Svalbard |
op_relation |
Ocean Science -- http://www.bibliothek.uni-regensburg.de/ezeit/?2183769 -- http://www.copernicus.org/EGU/os/os.html -- 1812-0792 https://doi.org/10.5194/os-14-127-2018 https://noa.gwlb.de/receive/cop_mods_00007267 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00007224/os-14-127-2018.pdf https://os.copernicus.org/articles/14/127/2018/os-14-127-2018.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/os-14-127-2018 |
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Ocean Science |
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14 |
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1 |
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127 |
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138 |
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1766321858709291008 |