Characterization of the circulation around, above and across (through fracture zones) the Reykjanes Ridge
The Reykjanes Ridge is a major topographic feature of the North-Atlantic Ocean that extends from Iceland to the Charlie Gibbs Fracture Zone. Located between the Iceland Basin and the Irminger Sea, the Reykjanes Ridge strongly influences the subpolar gyre circulation and is a gate toward the deep con...
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Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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2018
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Online Access: | https://tel.archives-ouvertes.fr/tel-02117700 https://tel.archives-ouvertes.fr/tel-02117700/document https://tel.archives-ouvertes.fr/tel-02117700/file/These-2018-SML-Oceanographie_physique_et_environnement-PETIT_Tillys.pdf |
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ftccsdartic:oai:HAL:tel-02117700v1 2023-05-15T16:47:26+02:00 Characterization of the circulation around, above and across (through fracture zones) the Reykjanes Ridge Caractérisation de la circulation autour, au-dessus et à travers (via des zones de fracture) la dorsale de Reykjanes Petit, Tillys 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)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Université de Bretagne occidentale - Brest Herlé Mercier Virginie Thierry 2018-11-15 https://tel.archives-ouvertes.fr/tel-02117700 https://tel.archives-ouvertes.fr/tel-02117700/document https://tel.archives-ouvertes.fr/tel-02117700/file/These-2018-SML-Oceanographie_physique_et_environnement-PETIT_Tillys.pdf en eng HAL CCSD NNT: 2018BRES0061 tel-02117700 https://tel.archives-ouvertes.fr/tel-02117700 https://tel.archives-ouvertes.fr/tel-02117700/document https://tel.archives-ouvertes.fr/tel-02117700/file/These-2018-SML-Oceanographie_physique_et_environnement-PETIT_Tillys.pdf info:eu-repo/semantics/OpenAccess https://tel.archives-ouvertes.fr/tel-02117700 Oceanography. Université de Bretagne occidentale - Brest, 2018. English. ⟨NNT : 2018BRES0061⟩ North-Atlantic Subpolar gyre Bathymetry Water masses Circulation Observations Gyre subpolaire Nord-Atlantique Bathymétrie Masses d’eau [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography info:eu-repo/semantics/doctoralThesis Theses 2018 ftccsdartic 2021-11-07T01:59:27Z The Reykjanes Ridge is a major topographic feature of the North-Atlantic Ocean that extends from Iceland to the Charlie Gibbs Fracture Zone. Located between the Iceland Basin and the Irminger Sea, the Reykjanes Ridge strongly influences the subpolar gyre circulation and is a gate toward the deep convection areas. However, the circulation and distribution across the Reykjanes Ridge has never been directly quantified such that the characterization of the connection between the Iceland Basin and the Irminger Sea is still incomplete. As part of the Reykjanes Ridge Experiment project, we were able to analyze the circulation around, above and across the Reykjanes Ridge. Mainly based on hydrographic sections along and perpendicular to the ridge axis, the aim of this PhD thesis was thus to characterize the 3-D circulation and properties of the flow along and across the Reykjanes Ridge.We started by accurately quantifying geostrophic transports across the sections, which led to improvements in the treatment of S-ADCP data. Across the Reykjanes Ridge, the intensity of the wesward branch of the subpolar gyre was estimated at21.9 + 2.5 Sv in June – July 2015 with intensifications at the Bight Fracture Zone (BFZ) and at 59 – 62°N. At the BFZ, overflow waters are influenced by the bathymetry such as their hydrological properties evolve as they cross the Reykjanes Ridge. Finally, both the bathymetry and the cyclonic horizontal circulation of the Iceland Basin regulate the evoluton of the along-ridge flows by blocking water masses, and thus shaping the water mass distribution over the Reykjanes Ridge. In addition to waters from the crossridge flow, the Irminger Current incorporates waters from the center of the Irminger Sea. La dorsale de Reykjanes est une structure topographique majeure de l’océan Atlantique Nord qui s’étend de l’Islande à la zone de fracture de Charlie Gibbs. Située entre le bassin d’Islande et la mer d’Irminger, la dorsale de Reykjanes influence fortement la circulation du gyre subpolaire et est une porte ... Doctoral or Postdoctoral Thesis Iceland North Atlantic Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Bight Fracture Zone ENVELOPE(-33.000,-33.000,56.833,56.833) Dorsale ENVELOPE(141.394,141.394,-66.820,-66.820) Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) La Dorsale ENVELOPE(141.394,141.394,-66.820,-66.820) Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) |
institution |
Open Polar |
collection |
Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) |
op_collection_id |
ftccsdartic |
language |
English |
topic |
North-Atlantic Subpolar gyre Bathymetry Water masses Circulation Observations Gyre subpolaire Nord-Atlantique Bathymétrie Masses d’eau [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
spellingShingle |
North-Atlantic Subpolar gyre Bathymetry Water masses Circulation Observations Gyre subpolaire Nord-Atlantique Bathymétrie Masses d’eau [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography Petit, Tillys Characterization of the circulation around, above and across (through fracture zones) the Reykjanes Ridge |
topic_facet |
North-Atlantic Subpolar gyre Bathymetry Water masses Circulation Observations Gyre subpolaire Nord-Atlantique Bathymétrie Masses d’eau [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography |
description |
The Reykjanes Ridge is a major topographic feature of the North-Atlantic Ocean that extends from Iceland to the Charlie Gibbs Fracture Zone. Located between the Iceland Basin and the Irminger Sea, the Reykjanes Ridge strongly influences the subpolar gyre circulation and is a gate toward the deep convection areas. However, the circulation and distribution across the Reykjanes Ridge has never been directly quantified such that the characterization of the connection between the Iceland Basin and the Irminger Sea is still incomplete. As part of the Reykjanes Ridge Experiment project, we were able to analyze the circulation around, above and across the Reykjanes Ridge. Mainly based on hydrographic sections along and perpendicular to the ridge axis, the aim of this PhD thesis was thus to characterize the 3-D circulation and properties of the flow along and across the Reykjanes Ridge.We started by accurately quantifying geostrophic transports across the sections, which led to improvements in the treatment of S-ADCP data. Across the Reykjanes Ridge, the intensity of the wesward branch of the subpolar gyre was estimated at21.9 + 2.5 Sv in June – July 2015 with intensifications at the Bight Fracture Zone (BFZ) and at 59 – 62°N. At the BFZ, overflow waters are influenced by the bathymetry such as their hydrological properties evolve as they cross the Reykjanes Ridge. Finally, both the bathymetry and the cyclonic horizontal circulation of the Iceland Basin regulate the evoluton of the along-ridge flows by blocking water masses, and thus shaping the water mass distribution over the Reykjanes Ridge. In addition to waters from the crossridge flow, the Irminger Current incorporates waters from the center of the Irminger Sea. La dorsale de Reykjanes est une structure topographique majeure de l’océan Atlantique Nord qui s’étend de l’Islande à la zone de fracture de Charlie Gibbs. Située entre le bassin d’Islande et la mer d’Irminger, la dorsale de Reykjanes influence fortement la circulation du gyre subpolaire et est une porte ... |
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)-Université de Brest (UBO)-Centre National de la Recherche Scientifique (CNRS) Université de Bretagne occidentale - Brest Herlé Mercier Virginie Thierry |
format |
Doctoral or Postdoctoral Thesis |
author |
Petit, Tillys |
author_facet |
Petit, Tillys |
author_sort |
Petit, Tillys |
title |
Characterization of the circulation around, above and across (through fracture zones) the Reykjanes Ridge |
title_short |
Characterization of the circulation around, above and across (through fracture zones) the Reykjanes Ridge |
title_full |
Characterization of the circulation around, above and across (through fracture zones) the Reykjanes Ridge |
title_fullStr |
Characterization of the circulation around, above and across (through fracture zones) the Reykjanes Ridge |
title_full_unstemmed |
Characterization of the circulation around, above and across (through fracture zones) the Reykjanes Ridge |
title_sort |
characterization of the circulation around, above and across (through fracture zones) the reykjanes ridge |
publisher |
HAL CCSD |
publishDate |
2018 |
url |
https://tel.archives-ouvertes.fr/tel-02117700 https://tel.archives-ouvertes.fr/tel-02117700/document https://tel.archives-ouvertes.fr/tel-02117700/file/These-2018-SML-Oceanographie_physique_et_environnement-PETIT_Tillys.pdf |
long_lat |
ENVELOPE(-33.000,-33.000,56.833,56.833) ENVELOPE(141.394,141.394,-66.820,-66.820) ENVELOPE(-34.041,-34.041,63.054,63.054) ENVELOPE(141.394,141.394,-66.820,-66.820) ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Bight Fracture Zone Dorsale Irminger Sea La Dorsale Reykjanes |
geographic_facet |
Bight Fracture Zone Dorsale Irminger Sea La Dorsale Reykjanes |
genre |
Iceland North Atlantic |
genre_facet |
Iceland North Atlantic |
op_source |
https://tel.archives-ouvertes.fr/tel-02117700 Oceanography. Université de Bretagne occidentale - Brest, 2018. English. ⟨NNT : 2018BRES0061⟩ |
op_relation |
NNT: 2018BRES0061 tel-02117700 https://tel.archives-ouvertes.fr/tel-02117700 https://tel.archives-ouvertes.fr/tel-02117700/document https://tel.archives-ouvertes.fr/tel-02117700/file/These-2018-SML-Oceanographie_physique_et_environnement-PETIT_Tillys.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1766037518800650240 |