Temporal evolution of decaying summer first-year sea ice in the Western Weddell Sea, Antarctica
peer reviewed The evolution of the main physico-chemical properties of the unflooded 90-cm-thick first-year sea-ice cover at the Ice Station POLarstern (ISPOL) "clean site" is described. ISPOL was an international experiment of the German research icebreaker R.V. Polarstern. The vessel was...
Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Pergamon Press - An Imprint of Elsevier Science
2008
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Online Access: | https://orbi.uliege.be/handle/2268/2143 https://doi.org/10.1016/j.dsr2.2007.12.021 |
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ftorbi:oai:orbi.ulg.ac.be:2268/2143 2024-04-21T07:52:07+00:00 Temporal evolution of decaying summer first-year sea ice in the Western Weddell Sea, Antarctica Tison, Jean-Louis Worby, A. Delille, Bruno Brabant, F. Papadimitriou, S. Thomas, David de Jong, J. Lannuzel, Delphine Haas, C. 2008 https://orbi.uliege.be/handle/2268/2143 https://doi.org/10.1016/j.dsr2.2007.12.021 en eng Pergamon Press - An Imprint of Elsevier Science http://www.elsevier.com/locate/dsr2 urn:issn:0967-0645 https://orbi.uliege.be/handle/2268/2143 info:hdl:2268/2143 doi:10.1016/j.dsr2.2007.12.021 scopus-id:2-s2.0-43649106868 restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess Deep-Sea Research. Part II, Topical Studies in Oceanography, 55 (8-9), 975-987 (2008) 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 2008 ftorbi https://doi.org/10.1016/j.dsr2.2007.12.021 2024-03-27T14:54:04Z peer reviewed The evolution of the main physico-chemical properties of the unflooded 90-cm-thick first-year sea-ice cover at the Ice Station POLarstern (ISPOL) "clean site" is described. ISPOL was an international experiment of the German research icebreaker R.V. Polarstern. The vessel was anchored to an ice floe for an observation period of 5 weeks, during the early summer melt onset in the Western Weddell Sea. The "clean site" was specially designed and accessed so as to prevent any trace metal contamination of the sampling area. Observations were made at 5-day intervals during December 2004 in the central part of the main floe. Results show the succession of two contrasting phases in the behavior of the brine network (brine channels, pockets, and tubes). Initially, brine salinity was higher than that of sea-water, leading to brine migration and a decrease in the mean bulk salinity of the ice cover. This process is highly favored by the already high bulk porosity (14%), which ensures full connectivity of the brine network. Gravity drainage rather than convection seems to be the dominant brine transfer process. Half-way through the observation period, the brine salinity became lower than that of the sea-water throughout the ice column. The brine network therefore switched to a "stratified" regime in which exchange with sea-water was limited to molecular diffusion, strongly stabilizing the bulk mean sea-ice salinity. During the transition between the two regimes, and in areas closer to ridges, slush water (resulting from a mixture of snow meltwater and sea water accumulated at the snow-ice interface) penetrated through the growing "honeycomb-like structure" and replaced the downward draining brines. This resulted in a slight local replenishment of nutrients (as indicated by dissolved silicic acid). However, as a whole, the described decaying regime in this globally unflooded location with limited snow cover should be unfavorable to the development of healthy and active surface and internal microbial ... Article in Journal/Newspaper Antarc* Antarctica Sea ice Weddell Sea University of Liège: ORBi (Open Repository and Bibliography) Deep Sea Research Part II: Topical Studies in Oceanography 55 8-9 975 987 |
institution |
Open Polar |
collection |
University of Liège: ORBi (Open Repository and Bibliography) |
op_collection_id |
ftorbi |
language |
English |
topic |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique |
spellingShingle |
Physical chemical mathematical & earth Sciences Earth sciences & physical geography Physique chimie mathématiques & sciences de la terre Sciences de la terre & géographie physique Tison, Jean-Louis Worby, A. Delille, Bruno Brabant, F. Papadimitriou, S. Thomas, David de Jong, J. Lannuzel, Delphine Haas, C. Temporal evolution of decaying summer first-year sea ice in the Western Weddell Sea, Antarctica |
topic_facet |
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 The evolution of the main physico-chemical properties of the unflooded 90-cm-thick first-year sea-ice cover at the Ice Station POLarstern (ISPOL) "clean site" is described. ISPOL was an international experiment of the German research icebreaker R.V. Polarstern. The vessel was anchored to an ice floe for an observation period of 5 weeks, during the early summer melt onset in the Western Weddell Sea. The "clean site" was specially designed and accessed so as to prevent any trace metal contamination of the sampling area. Observations were made at 5-day intervals during December 2004 in the central part of the main floe. Results show the succession of two contrasting phases in the behavior of the brine network (brine channels, pockets, and tubes). Initially, brine salinity was higher than that of sea-water, leading to brine migration and a decrease in the mean bulk salinity of the ice cover. This process is highly favored by the already high bulk porosity (14%), which ensures full connectivity of the brine network. Gravity drainage rather than convection seems to be the dominant brine transfer process. Half-way through the observation period, the brine salinity became lower than that of the sea-water throughout the ice column. The brine network therefore switched to a "stratified" regime in which exchange with sea-water was limited to molecular diffusion, strongly stabilizing the bulk mean sea-ice salinity. During the transition between the two regimes, and in areas closer to ridges, slush water (resulting from a mixture of snow meltwater and sea water accumulated at the snow-ice interface) penetrated through the growing "honeycomb-like structure" and replaced the downward draining brines. This resulted in a slight local replenishment of nutrients (as indicated by dissolved silicic acid). However, as a whole, the described decaying regime in this globally unflooded location with limited snow cover should be unfavorable to the development of healthy and active surface and internal microbial ... |
format |
Article in Journal/Newspaper |
author |
Tison, Jean-Louis Worby, A. Delille, Bruno Brabant, F. Papadimitriou, S. Thomas, David de Jong, J. Lannuzel, Delphine Haas, C. |
author_facet |
Tison, Jean-Louis Worby, A. Delille, Bruno Brabant, F. Papadimitriou, S. Thomas, David de Jong, J. Lannuzel, Delphine Haas, C. |
author_sort |
Tison, Jean-Louis |
title |
Temporal evolution of decaying summer first-year sea ice in the Western Weddell Sea, Antarctica |
title_short |
Temporal evolution of decaying summer first-year sea ice in the Western Weddell Sea, Antarctica |
title_full |
Temporal evolution of decaying summer first-year sea ice in the Western Weddell Sea, Antarctica |
title_fullStr |
Temporal evolution of decaying summer first-year sea ice in the Western Weddell Sea, Antarctica |
title_full_unstemmed |
Temporal evolution of decaying summer first-year sea ice in the Western Weddell Sea, Antarctica |
title_sort |
temporal evolution of decaying summer first-year sea ice in the western weddell sea, antarctica |
publisher |
Pergamon Press - An Imprint of Elsevier Science |
publishDate |
2008 |
url |
https://orbi.uliege.be/handle/2268/2143 https://doi.org/10.1016/j.dsr2.2007.12.021 |
genre |
Antarc* Antarctica Sea ice Weddell Sea |
genre_facet |
Antarc* Antarctica Sea ice Weddell Sea |
op_source |
Deep-Sea Research. Part II, Topical Studies in Oceanography, 55 (8-9), 975-987 (2008) |
op_relation |
http://www.elsevier.com/locate/dsr2 urn:issn:0967-0645 https://orbi.uliege.be/handle/2268/2143 info:hdl:2268/2143 doi:10.1016/j.dsr2.2007.12.021 scopus-id:2-s2.0-43649106868 |
op_rights |
restricted access http://purl.org/coar/access_right/c_16ec info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1016/j.dsr2.2007.12.021 |
container_title |
Deep Sea Research Part II: Topical Studies in Oceanography |
container_volume |
55 |
container_issue |
8-9 |
container_start_page |
975 |
op_container_end_page |
987 |
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1796935377205854208 |