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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Université de Bretagne occidentale
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fttriple:oai:gotriple.eu:10670/1.puxge3 2023-05-15T16:47:13+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 2018-11-15 https://archimer.ifremer.fr/doc/00498/60969/64377.pdf https://archimer.ifremer.fr/doc/00498/60969/ fr fre Université de Bretagne occidentale 10670/1.puxge3 https://archimer.ifremer.fr/doc/00498/60969/64377.pdf https://archimer.ifremer.fr/doc/00498/60969/ other Archimer, archive institutionnelle de l'Ifremer geo envir Text https://vocabularies.coar-repositories.org/resource_types/c_18cf/ 2018 fttriple 2023-01-22T17:05:47Z 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 ... Text Iceland North Atlantic Unknown 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) |
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Open Polar |
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Unknown |
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fttriple |
language |
French |
topic |
geo envir |
spellingShingle |
geo envir Petit, Tillys Characterization of the circulation around, above and across (through fracture zones) the Reykjanes Ridge |
topic_facet |
geo envir |
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 ... |
format |
Text |
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 |
Université de Bretagne occidentale |
publishDate |
2018 |
url |
https://archimer.ifremer.fr/doc/00498/60969/64377.pdf https://archimer.ifremer.fr/doc/00498/60969/ |
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 |
Archimer, archive institutionnelle de l'Ifremer |
op_relation |
10670/1.puxge3 https://archimer.ifremer.fr/doc/00498/60969/64377.pdf https://archimer.ifremer.fr/doc/00498/60969/ |
op_rights |
other |
_version_ |
1766037303790141440 |