Argo float observations of basin-scale deep convection in the Irminger sea during winter 2011-2012
International audience Analysis of Argo data obtained during winter 2011-2012 revealed the presence over the Irminger Basin of an exceptionally large number of profiles (41) with mixed layer depths (MLD) exceeding 700 m, which was deep enough to reach the pool of the intermediate Labrador Sea Water...
Published in: | Deep Sea Research Part I: Oceanographic Research Papers |
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Main Authors: | , , , |
Other Authors: | , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
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HAL CCSD
2016
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Online Access: | https://insu.hal.science/insu-03682717 https://insu.hal.science/insu-03682717/document https://insu.hal.science/insu-03682717/file/41354.pdf https://doi.org/10.1016/j.dsr.2015.12.012 |
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ftutoulouse3hal:oai:HAL:insu-03682717v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Université Toulouse III - Paul Sabatier: HAL-UPS |
op_collection_id |
ftutoulouse3hal |
language |
English |
topic |
Deep convection Irminger Sea Argo data Greenland Tip Jet Mixed layer dynamics Air-sea interactions [SDU]Sciences of the Universe [physics] |
spellingShingle |
Deep convection Irminger Sea Argo data Greenland Tip Jet Mixed layer dynamics Air-sea interactions [SDU]Sciences of the Universe [physics] Piron, Anne Thierry, Virginie Mercier, Herlé Caniaux, Guy Argo float observations of basin-scale deep convection in the Irminger sea during winter 2011-2012 |
topic_facet |
Deep convection Irminger Sea Argo data Greenland Tip Jet Mixed layer dynamics Air-sea interactions [SDU]Sciences of the Universe [physics] |
description |
International audience Analysis of Argo data obtained during winter 2011-2012 revealed the presence over the Irminger Basin of an exceptionally large number of profiles (41) with mixed layer depths (MLD) exceeding 700 m, which was deep enough to reach the pool of the intermediate Labrador Sea Water located in the Irminger Sea. Four of these profiles exhibited an MLD of 1000 m, which was the maximum value observed for the winter in question. The Argo sampling in the Irminger Sea during that winter, which was 3-4 times greater than for the preceding winters, enabled the different phases of the mixed layer deepening down to 1000 m, together with their spatial extents, to be observed for the first time. Two intense convective periods occurred: in late January south of Cape Farewell and in late February-early March east of Greenland. A final deepening period was observed in mid-March, during which the deepest mixed layers were observed. This long deepening period occurred in large regional areas and was followed by a rapid restratification phase. The temporal evolution of oxygen profiles from one Argo float testifies to the local and rapid ventilation of the mixed layer by the deep convection. A mixed layer heat budget along the trajectories of the 4 floats that sampled the deepest mixed layers showed that heat loss at the air-sea interface was mainly responsible for heat content variations in the mixed layer. Greenland Tip Jets were of primary importance for the development of deep convection in the Irminger Sea in the winter of 2011-2012. They enhanced the winter heat loss and two long (more than 24 h), intense late events close together in time pushed the mixed layer deepening down to 1000 m. Net air-sea fluxes, the number of Greenland Tip Jets, the stratification of the water column, the NAO index and the Ekman-induced heat flux are pertinent indicators to assess conditions that are favorable for the development of deep convection in the Irminger Sea. By considering each of those indicators, it was concluded ... |
author2 |
Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Centre national de recherches météorologiques (CNRM) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) |
format |
Article in Journal/Newspaper |
author |
Piron, Anne Thierry, Virginie Mercier, Herlé Caniaux, Guy |
author_facet |
Piron, Anne Thierry, Virginie Mercier, Herlé Caniaux, Guy |
author_sort |
Piron, Anne |
title |
Argo float observations of basin-scale deep convection in the Irminger sea during winter 2011-2012 |
title_short |
Argo float observations of basin-scale deep convection in the Irminger sea during winter 2011-2012 |
title_full |
Argo float observations of basin-scale deep convection in the Irminger sea during winter 2011-2012 |
title_fullStr |
Argo float observations of basin-scale deep convection in the Irminger sea during winter 2011-2012 |
title_full_unstemmed |
Argo float observations of basin-scale deep convection in the Irminger sea during winter 2011-2012 |
title_sort |
argo float observations of basin-scale deep convection in the irminger sea during winter 2011-2012 |
publisher |
HAL CCSD |
publishDate |
2016 |
url |
https://insu.hal.science/insu-03682717 https://insu.hal.science/insu-03682717/document https://insu.hal.science/insu-03682717/file/41354.pdf https://doi.org/10.1016/j.dsr.2015.12.012 |
genre |
Cape Farewell Greenland Labrador Sea |
genre_facet |
Cape Farewell Greenland Labrador Sea |
op_source |
ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://insu.hal.science/insu-03682717 Deep Sea Research Part I: Oceanographic Research Papers, 2016, 109, pp.76-90. ⟨10.1016/j.dsr.2015.12.012⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr.2015.12.012 insu-03682717 https://insu.hal.science/insu-03682717 https://insu.hal.science/insu-03682717/document https://insu.hal.science/insu-03682717/file/41354.pdf BIBCODE: 2016DSRI.109.76P doi:10.1016/j.dsr.2015.12.012 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1016/j.dsr.2015.12.012 |
container_title |
Deep Sea Research Part I: Oceanographic Research Papers |
container_volume |
109 |
container_start_page |
76 |
op_container_end_page |
90 |
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1810438644163411968 |
spelling |
ftutoulouse3hal:oai:HAL:insu-03682717v1 2024-09-15T18:01:30+00:00 Argo float observations of basin-scale deep convection in the Irminger sea during winter 2011-2012 Piron, Anne Thierry, Virginie Mercier, Herlé Caniaux, Guy Laboratoire d'Océanographie Physique et Spatiale (LOPS) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Institut national des sciences de l'Univers (INSU - CNRS)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Centre national de recherches météorologiques (CNRM) Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire Midi-Pyrénées (OMP) Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3) Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS) 2016 https://insu.hal.science/insu-03682717 https://insu.hal.science/insu-03682717/document https://insu.hal.science/insu-03682717/file/41354.pdf https://doi.org/10.1016/j.dsr.2015.12.012 en eng HAL CCSD Elsevier info:eu-repo/semantics/altIdentifier/doi/10.1016/j.dsr.2015.12.012 insu-03682717 https://insu.hal.science/insu-03682717 https://insu.hal.science/insu-03682717/document https://insu.hal.science/insu-03682717/file/41354.pdf BIBCODE: 2016DSRI.109.76P doi:10.1016/j.dsr.2015.12.012 info:eu-repo/semantics/OpenAccess ISSN: 0967-0637 Deep Sea Research Part I: Oceanographic Research Papers https://insu.hal.science/insu-03682717 Deep Sea Research Part I: Oceanographic Research Papers, 2016, 109, pp.76-90. ⟨10.1016/j.dsr.2015.12.012⟩ Deep convection Irminger Sea Argo data Greenland Tip Jet Mixed layer dynamics Air-sea interactions [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2016 ftutoulouse3hal https://doi.org/10.1016/j.dsr.2015.12.012 2024-06-25T00:05:42Z International audience Analysis of Argo data obtained during winter 2011-2012 revealed the presence over the Irminger Basin of an exceptionally large number of profiles (41) with mixed layer depths (MLD) exceeding 700 m, which was deep enough to reach the pool of the intermediate Labrador Sea Water located in the Irminger Sea. Four of these profiles exhibited an MLD of 1000 m, which was the maximum value observed for the winter in question. The Argo sampling in the Irminger Sea during that winter, which was 3-4 times greater than for the preceding winters, enabled the different phases of the mixed layer deepening down to 1000 m, together with their spatial extents, to be observed for the first time. Two intense convective periods occurred: in late January south of Cape Farewell and in late February-early March east of Greenland. A final deepening period was observed in mid-March, during which the deepest mixed layers were observed. This long deepening period occurred in large regional areas and was followed by a rapid restratification phase. The temporal evolution of oxygen profiles from one Argo float testifies to the local and rapid ventilation of the mixed layer by the deep convection. A mixed layer heat budget along the trajectories of the 4 floats that sampled the deepest mixed layers showed that heat loss at the air-sea interface was mainly responsible for heat content variations in the mixed layer. Greenland Tip Jets were of primary importance for the development of deep convection in the Irminger Sea in the winter of 2011-2012. They enhanced the winter heat loss and two long (more than 24 h), intense late events close together in time pushed the mixed layer deepening down to 1000 m. Net air-sea fluxes, the number of Greenland Tip Jets, the stratification of the water column, the NAO index and the Ekman-induced heat flux are pertinent indicators to assess conditions that are favorable for the development of deep convection in the Irminger Sea. By considering each of those indicators, it was concluded ... Article in Journal/Newspaper Cape Farewell Greenland Labrador Sea Université Toulouse III - Paul Sabatier: HAL-UPS Deep Sea Research Part I: Oceanographic Research Papers 109 76 90 |