Small-scale melt processes governing the flushing of nutrients from a first-year sea-ice, Hudson-Bay, canada
This work formed part of a multi disciplinary research programme conducted 25 km offshore of Kuujjuarapik in southeastern Hudson Bay (Canadian Arctic). Large differences in salinity and nutrient concentration between brine, ice and under-ice surface water were used to study the different phases obse...
Main Authors: | , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Gauthier-Villars
1994
|
Subjects: | |
Online Access: | https://archimer.ifremer.fr/doc/00098/20900/18513.pdf https://archimer.ifremer.fr/doc/00098/20900/ |
id |
ftarchimer:oai:archimer.ifremer.fr:20900 |
---|---|
record_format |
openpolar |
spelling |
ftarchimer:oai:archimer.ifremer.fr:20900 2023-05-15T15:08:29+02:00 Small-scale melt processes governing the flushing of nutrients from a first-year sea-ice, Hudson-Bay, canada Hudier, E Ingram, G 1994 application/pdf https://archimer.ifremer.fr/doc/00098/20900/18513.pdf https://archimer.ifremer.fr/doc/00098/20900/ eng eng Gauthier-Villars https://archimer.ifremer.fr/doc/00098/20900/18513.pdf https://archimer.ifremer.fr/doc/00098/20900/ info:eu-repo/semantics/openAccess restricted use Oceanologica Acta (0399-1784) (Gauthier-Villars), 1994 , Vol. 17 , N. 4 , P. 397-403 text Publication info:eu-repo/semantics/article 1994 ftarchimer 2021-09-23T20:21:17Z This work formed part of a multi disciplinary research programme conducted 25 km offshore of Kuujjuarapik in southeastern Hudson Bay (Canadian Arctic). Large differences in salinity and nutrient concentration between brine, ice and under-ice surface water were used to study the different phases observed during the period of melt initiation. We present a discussion of processes governing the flushing of brine and the development of a melt layer below first-year sea ice. Phosphate, nitrate + nitrite and silicic acid distributions within the first 30 cm below the ice are described. Three distinct steps were observed during the melt initiation: a phase of brine rejection; a phase of flushing associated with the development of a buoyant melt layer rich in nutrients; and a phase of melt of the ice-water interface characterized by the development of a melt layer poor in nutrients. The flux of brine during the four days of brine flushing was estimated at 0,009 m(3)/day/m(2) (i.e. equivalent to a melt rate of 9 mm/day). Our findings confirm that exchanges between the water column and the sea-ice sheet are dominated by tidal current fluctuations. The increase of current velocities provoked the pumping of a fraction of the bottom-ice brine content and a dissipation of vertical structures. Low tidal velocity periods created conditions suitable for the development of a melt layer. Article in Journal/Newspaper Arctic Hudson Bay Ice Sheet Kuujjuarapik Sea ice Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Arctic Canada Hudson Hudson Bay Kuujjuarapik ENVELOPE(-77.762,-77.762,55.276,55.276) |
institution |
Open Polar |
collection |
Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) |
op_collection_id |
ftarchimer |
language |
English |
description |
This work formed part of a multi disciplinary research programme conducted 25 km offshore of Kuujjuarapik in southeastern Hudson Bay (Canadian Arctic). Large differences in salinity and nutrient concentration between brine, ice and under-ice surface water were used to study the different phases observed during the period of melt initiation. We present a discussion of processes governing the flushing of brine and the development of a melt layer below first-year sea ice. Phosphate, nitrate + nitrite and silicic acid distributions within the first 30 cm below the ice are described. Three distinct steps were observed during the melt initiation: a phase of brine rejection; a phase of flushing associated with the development of a buoyant melt layer rich in nutrients; and a phase of melt of the ice-water interface characterized by the development of a melt layer poor in nutrients. The flux of brine during the four days of brine flushing was estimated at 0,009 m(3)/day/m(2) (i.e. equivalent to a melt rate of 9 mm/day). Our findings confirm that exchanges between the water column and the sea-ice sheet are dominated by tidal current fluctuations. The increase of current velocities provoked the pumping of a fraction of the bottom-ice brine content and a dissipation of vertical structures. Low tidal velocity periods created conditions suitable for the development of a melt layer. |
format |
Article in Journal/Newspaper |
author |
Hudier, E Ingram, G |
spellingShingle |
Hudier, E Ingram, G Small-scale melt processes governing the flushing of nutrients from a first-year sea-ice, Hudson-Bay, canada |
author_facet |
Hudier, E Ingram, G |
author_sort |
Hudier, E |
title |
Small-scale melt processes governing the flushing of nutrients from a first-year sea-ice, Hudson-Bay, canada |
title_short |
Small-scale melt processes governing the flushing of nutrients from a first-year sea-ice, Hudson-Bay, canada |
title_full |
Small-scale melt processes governing the flushing of nutrients from a first-year sea-ice, Hudson-Bay, canada |
title_fullStr |
Small-scale melt processes governing the flushing of nutrients from a first-year sea-ice, Hudson-Bay, canada |
title_full_unstemmed |
Small-scale melt processes governing the flushing of nutrients from a first-year sea-ice, Hudson-Bay, canada |
title_sort |
small-scale melt processes governing the flushing of nutrients from a first-year sea-ice, hudson-bay, canada |
publisher |
Gauthier-Villars |
publishDate |
1994 |
url |
https://archimer.ifremer.fr/doc/00098/20900/18513.pdf https://archimer.ifremer.fr/doc/00098/20900/ |
long_lat |
ENVELOPE(-77.762,-77.762,55.276,55.276) |
geographic |
Arctic Canada Hudson Hudson Bay Kuujjuarapik |
geographic_facet |
Arctic Canada Hudson Hudson Bay Kuujjuarapik |
genre |
Arctic Hudson Bay Ice Sheet Kuujjuarapik Sea ice |
genre_facet |
Arctic Hudson Bay Ice Sheet Kuujjuarapik Sea ice |
op_source |
Oceanologica Acta (0399-1784) (Gauthier-Villars), 1994 , Vol. 17 , N. 4 , P. 397-403 |
op_relation |
https://archimer.ifremer.fr/doc/00098/20900/18513.pdf https://archimer.ifremer.fr/doc/00098/20900/ |
op_rights |
info:eu-repo/semantics/openAccess restricted use |
_version_ |
1766339846961364992 |