Dense shelf water production in the Adélie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving
Summer repeated hydrographic surveys and 4 years of mooring observations are used to characterize for the first time the interannual variability of the bottom water in the Mertz Glacier Polynya (MGP) on the East Antarctic shelf (142°E–146°E). Until 2010, large interannual variability was observed in...
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ftarchimer:oai:archimer.ifremer.fr:31514 2023-05-15T13:50:49+02:00 Dense shelf water production in the Adélie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving Lacarra, Maite Houssais, Marie-noelle Herbaut, Christophe Sultan, Emmanuelle Beauverger, Mickael 2014-08 application/pdf https://archimer.ifremer.fr/doc/00204/31514/29928.pdf https://doi.org/10.1002/2013JC009124 https://archimer.ifremer.fr/doc/00204/31514/ eng eng Amer Geophysical Union https://archimer.ifremer.fr/doc/00204/31514/29928.pdf doi:10.1002/2013JC009124 https://archimer.ifremer.fr/doc/00204/31514/ 2014. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use Journal Of Geophysical Research-oceans (0148-0027) (Amer Geophysical Union), 2014-08 , Vol. 119 , N. 8 , P. 5203-5220 text Publication info:eu-repo/semantics/article 2014 ftarchimer https://doi.org/10.1002/2013JC009124 2021-09-23T20:24:46Z Summer repeated hydrographic surveys and 4 years of mooring observations are used to characterize for the first time the interannual variability of the bottom water in the Mertz Glacier Polynya (MGP) on the East Antarctic shelf (142°E–146°E). Until 2010, large interannual variability was observed in the summer bottom salinity with year-to-year changes reaching 0.12 in Commonwealth Bay, the region with the highest sea ice production. The summer variability was shown to be linked to the efficiency of the convection during the preceding winter. The recent freshening of the bottom waters subsequent to the Mertz Glacier calving was well beyond the range of the precalving interannual variability. Within 2 years after the event, the bottom water of the shelf became too light to possibly contribute to renewal of the Antarctic Bottom Water. Rough estimates of the freshwater budget of the Adélie Depression indicate that the freshening necessary to compensate for net sea ice production in the MGP did not change drastically after the Mertz calving. The year-to-year salinity changes appeared to respond to the MGP activity. Yet, prior to the calving, the convective system in the polynya was also partly controlled by the late winter bottom salinity through a mechanism leading to a sequence of alternatively fresher and more saline bottom waters over the period 2007–2010. Exceptional events like the Mertz calving seem to be able to switch over the system into a less stratified state where convection responds more directly to changes in the surface forcing. Article in Journal/Newspaper Antarc* Antarctic Antarctica East Antarctica Mertz Glacier Sea ice Archimer (Archive Institutionnelle de l'Ifremer - Institut français de recherche pour l'exploitation de la mer) Antarctic Commonwealth Bay ENVELOPE(142.500,142.500,-67.000,-67.000) East Antarctica Mertz Glacier ENVELOPE(144.500,144.500,-67.667,-67.667) The Antarctic Journal of Geophysical Research: Oceans 119 8 5203 5220 |
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 |
Summer repeated hydrographic surveys and 4 years of mooring observations are used to characterize for the first time the interannual variability of the bottom water in the Mertz Glacier Polynya (MGP) on the East Antarctic shelf (142°E–146°E). Until 2010, large interannual variability was observed in the summer bottom salinity with year-to-year changes reaching 0.12 in Commonwealth Bay, the region with the highest sea ice production. The summer variability was shown to be linked to the efficiency of the convection during the preceding winter. The recent freshening of the bottom waters subsequent to the Mertz Glacier calving was well beyond the range of the precalving interannual variability. Within 2 years after the event, the bottom water of the shelf became too light to possibly contribute to renewal of the Antarctic Bottom Water. Rough estimates of the freshwater budget of the Adélie Depression indicate that the freshening necessary to compensate for net sea ice production in the MGP did not change drastically after the Mertz calving. The year-to-year salinity changes appeared to respond to the MGP activity. Yet, prior to the calving, the convective system in the polynya was also partly controlled by the late winter bottom salinity through a mechanism leading to a sequence of alternatively fresher and more saline bottom waters over the period 2007–2010. Exceptional events like the Mertz calving seem to be able to switch over the system into a less stratified state where convection responds more directly to changes in the surface forcing. |
format |
Article in Journal/Newspaper |
author |
Lacarra, Maite Houssais, Marie-noelle Herbaut, Christophe Sultan, Emmanuelle Beauverger, Mickael |
spellingShingle |
Lacarra, Maite Houssais, Marie-noelle Herbaut, Christophe Sultan, Emmanuelle Beauverger, Mickael Dense shelf water production in the Adélie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
author_facet |
Lacarra, Maite Houssais, Marie-noelle Herbaut, Christophe Sultan, Emmanuelle Beauverger, Mickael |
author_sort |
Lacarra, Maite |
title |
Dense shelf water production in the Adélie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
title_short |
Dense shelf water production in the Adélie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
title_full |
Dense shelf water production in the Adélie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
title_fullStr |
Dense shelf water production in the Adélie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
title_full_unstemmed |
Dense shelf water production in the Adélie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
title_sort |
dense shelf water production in the adélie depression, east antarctica, 2004-2012: impact of the mertz glacier calving |
publisher |
Amer Geophysical Union |
publishDate |
2014 |
url |
https://archimer.ifremer.fr/doc/00204/31514/29928.pdf https://doi.org/10.1002/2013JC009124 https://archimer.ifremer.fr/doc/00204/31514/ |
long_lat |
ENVELOPE(142.500,142.500,-67.000,-67.000) ENVELOPE(144.500,144.500,-67.667,-67.667) |
geographic |
Antarctic Commonwealth Bay East Antarctica Mertz Glacier The Antarctic |
geographic_facet |
Antarctic Commonwealth Bay East Antarctica Mertz Glacier The Antarctic |
genre |
Antarc* Antarctic Antarctica East Antarctica Mertz Glacier Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Mertz Glacier Sea ice |
op_source |
Journal Of Geophysical Research-oceans (0148-0027) (Amer Geophysical Union), 2014-08 , Vol. 119 , N. 8 , P. 5203-5220 |
op_relation |
https://archimer.ifremer.fr/doc/00204/31514/29928.pdf doi:10.1002/2013JC009124 https://archimer.ifremer.fr/doc/00204/31514/ |
op_rights |
2014. American Geophysical Union. All Rights Reserved. info:eu-repo/semantics/openAccess restricted use |
op_doi |
https://doi.org/10.1002/2013JC009124 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
119 |
container_issue |
8 |
container_start_page |
5203 |
op_container_end_page |
5220 |
_version_ |
1766254117000314880 |