Observed mean and mesoscale upper ocean circulation in the midlatitude northeast Atlantic
Lagrangian instruments and altimetry data are used to investigate the upper (0 to $500 m) mean and mesoscale circulations in a region of the midlatitude northeast Atlantic (36°-47°N, 13°-23°W), a formation and subduction area of Subpolar Mode Water. Lagrangian data were collected between September 2...
Published in: | Journal of Geophysical Research |
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Main Authors: | , , , |
Other Authors: | , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
HAL CCSD
2005
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Online Access: | https://hal.science/hal-00124658 https://hal.science/hal-00124658/document https://hal.science/hal-00124658/file/2004JC002768.pdf https://doi.org/10.1029/2004JC002768 |
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openpolar |
institution |
Open Polar |
collection |
HAL Sorbonne Université |
op_collection_id |
ftsorbonneuniv |
language |
English |
topic |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
spellingShingle |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] Le Cann, Bernard Assenbaum, Michel Gascard, Jean-Claude Reverdin, Gilles Observed mean and mesoscale upper ocean circulation in the midlatitude northeast Atlantic |
topic_facet |
[PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] |
description |
Lagrangian instruments and altimetry data are used to investigate the upper (0 to $500 m) mean and mesoscale circulations in a region of the midlatitude northeast Atlantic (36°-47°N, 13°-23°W), a formation and subduction area of Subpolar Mode Water. Lagrangian data were collected between September 2000 and September 2001 with isobaric subsurface floats, totaling 34.0 float years, and surface drifting buoys, totaling 27.9 buoy years. The near-surface (0-100 m) mean circulation is dominated by two weak ($5 cm/s) eastward currents which veer southward in the domain. In the 100-to 500-m-deep layer, these eastward mean currents retroflect westward and form two anticyclonic circulation cells, opened to the west and separated by a cyclonic cell. Eddy kinetic energy is decreasing from the northwest to the southeast of the area, from $100-200 (cm/s) 2 to $20-30 (cm/s) 2. Long-lived anticyclones and cyclones display mean coherent displacements, both to the southwest. Westward eddy propagation speeds, close to that of long Rossby waves, increase southward and are consistent with a superposition of beta effect and advection by mean currents. Southward eddy displacements are coherent with the observed mean currents. In the north, anticyclones are seen to consist of Central and Subpolar Mode Water eddies, most of them likely originating from the eastern boundary, whereas in the south, most anticyclonic features result from the influence of ''Mediterranean Water Eddies'' (meddies) on the upper layers. Cyclonic activity is concentrated in ''cyclonic zones,'' which are seen to exchange floats and water properties. |
author2 |
Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) 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)-Observatoire Midi-Pyrénées (OMP) 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)-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) Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 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) |
format |
Article in Journal/Newspaper |
author |
Le Cann, Bernard Assenbaum, Michel Gascard, Jean-Claude Reverdin, Gilles |
author_facet |
Le Cann, Bernard Assenbaum, Michel Gascard, Jean-Claude Reverdin, Gilles |
author_sort |
Le Cann, Bernard |
title |
Observed mean and mesoscale upper ocean circulation in the midlatitude northeast Atlantic |
title_short |
Observed mean and mesoscale upper ocean circulation in the midlatitude northeast Atlantic |
title_full |
Observed mean and mesoscale upper ocean circulation in the midlatitude northeast Atlantic |
title_fullStr |
Observed mean and mesoscale upper ocean circulation in the midlatitude northeast Atlantic |
title_full_unstemmed |
Observed mean and mesoscale upper ocean circulation in the midlatitude northeast Atlantic |
title_sort |
observed mean and mesoscale upper ocean circulation in the midlatitude northeast atlantic |
publisher |
HAL CCSD |
publishDate |
2005 |
url |
https://hal.science/hal-00124658 https://hal.science/hal-00124658/document https://hal.science/hal-00124658/file/2004JC002768.pdf https://doi.org/10.1029/2004JC002768 |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00124658 Journal of Geophysical Research, 2005, 110, pp.C07S05. ⟨10.1029/2004JC002768⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2004JC002768 hal-00124658 https://hal.science/hal-00124658 https://hal.science/hal-00124658/document https://hal.science/hal-00124658/file/2004JC002768.pdf doi:10.1029/2004JC002768 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2004JC002768 |
container_title |
Journal of Geophysical Research |
container_volume |
110 |
container_issue |
C7 |
_version_ |
1799485902027751424 |
spelling |
ftsorbonneuniv:oai:HAL:hal-00124658v1 2024-05-19T07:45:47+00:00 Observed mean and mesoscale upper ocean circulation in the midlatitude northeast Atlantic Le Cann, Bernard Assenbaum, Michel Gascard, Jean-Claude Reverdin, Gilles Laboratoire de physique des océans (LPO) Institut de Recherche pour le Développement (IRD)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Laboratoire d'études en Géophysique et océanographie spatiales (LEGOS) 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)-Observatoire Midi-Pyrénées (OMP) 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)-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) Laboratoire d'océanographie dynamique et de climatologie (LODYC) Institut de Recherche pour le Développement (IRD)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) 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) 2005 https://hal.science/hal-00124658 https://hal.science/hal-00124658/document https://hal.science/hal-00124658/file/2004JC002768.pdf https://doi.org/10.1029/2004JC002768 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2004JC002768 hal-00124658 https://hal.science/hal-00124658 https://hal.science/hal-00124658/document https://hal.science/hal-00124658/file/2004JC002768.pdf doi:10.1029/2004JC002768 info:eu-repo/semantics/OpenAccess ISSN: 0148-0227 EISSN: 2156-2202 Journal of Geophysical Research https://hal.science/hal-00124658 Journal of Geophysical Research, 2005, 110, pp.C07S05. ⟨10.1029/2004JC002768⟩ [PHYS.PHYS.PHYS-GEO-PH]Physics [physics]/Physics [physics]/Geophysics [physics.geo-ph] info:eu-repo/semantics/article Journal articles 2005 ftsorbonneuniv https://doi.org/10.1029/2004JC002768 2024-04-25T03:59:36Z Lagrangian instruments and altimetry data are used to investigate the upper (0 to $500 m) mean and mesoscale circulations in a region of the midlatitude northeast Atlantic (36°-47°N, 13°-23°W), a formation and subduction area of Subpolar Mode Water. Lagrangian data were collected between September 2000 and September 2001 with isobaric subsurface floats, totaling 34.0 float years, and surface drifting buoys, totaling 27.9 buoy years. The near-surface (0-100 m) mean circulation is dominated by two weak ($5 cm/s) eastward currents which veer southward in the domain. In the 100-to 500-m-deep layer, these eastward mean currents retroflect westward and form two anticyclonic circulation cells, opened to the west and separated by a cyclonic cell. Eddy kinetic energy is decreasing from the northwest to the southeast of the area, from $100-200 (cm/s) 2 to $20-30 (cm/s) 2. Long-lived anticyclones and cyclones display mean coherent displacements, both to the southwest. Westward eddy propagation speeds, close to that of long Rossby waves, increase southward and are consistent with a superposition of beta effect and advection by mean currents. Southward eddy displacements are coherent with the observed mean currents. In the north, anticyclones are seen to consist of Central and Subpolar Mode Water eddies, most of them likely originating from the eastern boundary, whereas in the south, most anticyclonic features result from the influence of ''Mediterranean Water Eddies'' (meddies) on the upper layers. Cyclonic activity is concentrated in ''cyclonic zones,'' which are seen to exchange floats and water properties. Article in Journal/Newspaper Northeast Atlantic HAL Sorbonne Université Journal of Geophysical Research 110 C7 |