Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving
International audience 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 vari...
Published in: | Journal of Geophysical Research: Oceans |
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Main Authors: | , , , , |
Other Authors: | , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2014
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Subjects: | |
Online Access: | https://hal.univ-brest.fr/hal-01111515 https://hal.univ-brest.fr/hal-01111515/document https://hal.univ-brest.fr/hal-01111515/file/jgrclacarra.pdf https://doi.org/10.1002/2013JC009124 |
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ftuniversailles:oai:HAL:hal-01111515v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ |
op_collection_id |
ftuniversailles |
language |
English |
topic |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Lacarra, Maïté Houssais, Marie-Noëlle Herbaut, Christophe Sultan, Emmanuelle Beauverger, Mickael Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
topic_facet |
[SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
International audience 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 Ad elie Depression indicate that the freshening necessary to compensate for net sea ice production in the MGP did not change drasti-cally 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 bot-tom 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. |
author2 |
Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Variabilité de l'Océan et de la Glace de mer (VOG) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Laboratoire de Microbiologie des Environnements Extrêmophiles (LM2E) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Lacarra, Maïté Houssais, Marie-Noëlle Herbaut, Christophe Sultan, Emmanuelle Beauverger, Mickael |
author_facet |
Lacarra, Maïté Houssais, Marie-Noëlle Herbaut, Christophe Sultan, Emmanuelle Beauverger, Mickael |
author_sort |
Lacarra, Maïté |
title |
Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
title_short |
Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
title_full |
Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
title_fullStr |
Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
title_full_unstemmed |
Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving |
title_sort |
dense shelf water production in the adelie depression, east antarctica, 2004-2012: impact of the mertz glacier calving |
publisher |
HAL CCSD |
publishDate |
2014 |
url |
https://hal.univ-brest.fr/hal-01111515 https://hal.univ-brest.fr/hal-01111515/document https://hal.univ-brest.fr/hal-01111515/file/jgrclacarra.pdf https://doi.org/10.1002/2013JC009124 |
genre |
Antarc* Antarctic Antarctica East Antarctica Mertz Glacier Sea ice |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica Mertz Glacier Sea ice |
op_source |
ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.univ-brest.fr/hal-01111515 Journal of Geophysical Research. Oceans, 2014, 119 (8), pp.5203-5220. ⟨10.1002/2013JC009124⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1002/2013JC009124 hal-01111515 https://hal.univ-brest.fr/hal-01111515 https://hal.univ-brest.fr/hal-01111515/document https://hal.univ-brest.fr/hal-01111515/file/jgrclacarra.pdf doi:10.1002/2013JC009124 |
op_rights |
info:eu-repo/semantics/OpenAccess |
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 |
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1799483688391540736 |
spelling |
ftuniversailles:oai:HAL:hal-01111515v1 2024-05-19T07:30:05+00:00 Dense shelf water production in the Adelie Depression, East Antarctica, 2004-2012: Impact of the Mertz Glacier calving Lacarra, Maïté Houssais, Marie-Noëlle Herbaut, Christophe Sultan, Emmanuelle Beauverger, Mickael Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS-PSL) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Variabilité de l'Océan et de la Glace de mer (VOG) Université Paris Sciences et Lettres (PSL)-Université Paris Sciences et Lettres (PSL)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) Laboratoire de Microbiologie des Environnements Extrêmophiles (LM2E) Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) 2014-08-15 https://hal.univ-brest.fr/hal-01111515 https://hal.univ-brest.fr/hal-01111515/document https://hal.univ-brest.fr/hal-01111515/file/jgrclacarra.pdf https://doi.org/10.1002/2013JC009124 en eng HAL CCSD Wiley-Blackwell info:eu-repo/semantics/altIdentifier/doi/10.1002/2013JC009124 hal-01111515 https://hal.univ-brest.fr/hal-01111515 https://hal.univ-brest.fr/hal-01111515/document https://hal.univ-brest.fr/hal-01111515/file/jgrclacarra.pdf doi:10.1002/2013JC009124 info:eu-repo/semantics/OpenAccess ISSN: 2169-9275 EISSN: 2169-9291 Journal of Geophysical Research. Oceans https://hal.univ-brest.fr/hal-01111515 Journal of Geophysical Research. Oceans, 2014, 119 (8), pp.5203-5220. ⟨10.1002/2013JC009124⟩ [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2014 ftuniversailles https://doi.org/10.1002/2013JC009124 2024-04-25T00:37:04Z International audience 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 Ad elie Depression indicate that the freshening necessary to compensate for net sea ice production in the MGP did not change drasti-cally 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 bot-tom 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 Université de Versailles Saint-Quentin-en-Yvelines: HAL-UVSQ Journal of Geophysical Research: Oceans 119 8 5203 5220 |