On topography-related dynamics in the Argentine Basin
The Argentine Basin (>5000 m) is home to rather unique oceanic structures of prime importance to the global circulation. In this thesis, we focus on elements of circulation (ocean waves and currents) constrained by topography. To the west, the Patagonian continental shelf of variable slope and di...
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Other Authors: | , , , , , , , , , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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HAL CCSD
2023
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Subjects: | |
Online Access: | https://theses.hal.science/tel-04391274 https://theses.hal.science/tel-04391274/document https://theses.hal.science/tel-04391274/file/POLI_Lea_these_2023.pdf |
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ftinsu:oai:HAL:tel-04391274v1 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
Institut national des sciences de l'Univers: HAL-INSU |
op_collection_id |
ftinsu |
language |
English |
topic |
Physical Oceanography Dynamics Tropographic Waves Variability Topography Océanographie physique Dynamique Ondes topographiques Variabilité Topographie [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
spellingShingle |
Physical Oceanography Dynamics Tropographic Waves Variability Topography Océanographie physique Dynamique Ondes topographiques Variabilité Topographie [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere Poli, Léa On topography-related dynamics in the Argentine Basin |
topic_facet |
Physical Oceanography Dynamics Tropographic Waves Variability Topography Océanographie physique Dynamique Ondes topographiques Variabilité Topographie [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere |
description |
The Argentine Basin (>5000 m) is home to rather unique oceanic structures of prime importance to the global circulation. In this thesis, we focus on elements of circulation (ocean waves and currents) constrained by topography. To the west, the Patagonian continental shelf of variable slope and direction hosts a variety of topographic waves. By combining outputs of a high-resolution reanalysis (GLORYS12), in-situ and satellite data, two types of sub-inertial waves were documented, fast and slow waves. Fast waves propagating along the Patagonian shelf break, with phase velocities between 1 m/s and 7 m/s, periods ranging from 5 to 130 days and wavelengths from 1,200 to 12,000 km. Their characteristics depend upon stratification, slope, shelf width, latitude and mean flow. High-frequency waves with periods between 5 and 40 days are often locally forced by strong variations of the zonal wind south of 47°S(Poli et al.,2020), whereas lower-frequency waves with periods between 40 and 130 days propagate from the equatorial Pacific to the tropical Atlantic (22°S, Poli et al.,2022). The Madden-Julian Oscillation (MJO) plays a key role in forcing these low-frequency waves in two ways. (a) By an oceanic teleconnection involving equatorial Kelvin waves reaching the American west coast, and (b) by an atmospheric teleconnection reinforcing southerly winds in the southeast Pacific. In addition, local winds, which are not necessarily linked to the MJO, modulate and trigger low-frequency waves (40-130 days period) in specific locations, such as the Brazil-Malvinas confluence and the Drake Passage. All these waves have an impact on along-shore currents : during the positive phase, the near-surface current is increased by around 0.1 m/s. In addition, these waves contribute to the supply of nutrients sustaining the high primary production on the Patagonian shelf. Slow waves propagate in the core of the Malvinas Current with phase velocities between 0.10 and 0.30 m/s, periods around 20, 60 and 100 days, and wavelengths ranging ... |
author2 |
Austral, Boréal et Carbone (ABC) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) 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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Sorbonne Université Jérôme Sirven Camila Artana |
format |
Doctoral or Postdoctoral Thesis |
author |
Poli, Léa |
author_facet |
Poli, Léa |
author_sort |
Poli, Léa |
title |
On topography-related dynamics in the Argentine Basin |
title_short |
On topography-related dynamics in the Argentine Basin |
title_full |
On topography-related dynamics in the Argentine Basin |
title_fullStr |
On topography-related dynamics in the Argentine Basin |
title_full_unstemmed |
On topography-related dynamics in the Argentine Basin |
title_sort |
on topography-related dynamics in the argentine basin |
publisher |
HAL CCSD |
publishDate |
2023 |
url |
https://theses.hal.science/tel-04391274 https://theses.hal.science/tel-04391274/document https://theses.hal.science/tel-04391274/file/POLI_Lea_these_2023.pdf |
genre |
Drake Passage |
genre_facet |
Drake Passage |
op_source |
https://theses.hal.science/tel-04391274 Oceanography. Sorbonne Université, 2023. English. ⟨NNT : 2023SORUS409⟩ |
op_relation |
NNT: 2023SORUS409 tel-04391274 https://theses.hal.science/tel-04391274 https://theses.hal.science/tel-04391274/document https://theses.hal.science/tel-04391274/file/POLI_Lea_these_2023.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1797581944933842944 |
spelling |
ftinsu:oai:HAL:tel-04391274v1 2024-04-28T08:17:13+00:00 On topography-related dynamics in the Argentine Basin Sur des éléments de circulation contraints par la topographie dans le Bassin Argentin Poli, Léa Austral, Boréal et Carbone (ABC) Laboratoire d'Océanographie et du Climat : Expérimentations et Approches Numériques (LOCEAN) Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité)-Muséum national d'Histoire naturelle (MNHN)-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut Pierre-Simon-Laplace (IPSL (FR_636)) 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)-École polytechnique (X)-Centre National d'Études Spatiales Toulouse (CNES)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité) Sorbonne Université Jérôme Sirven Camila Artana 2023-10-03 https://theses.hal.science/tel-04391274 https://theses.hal.science/tel-04391274/document https://theses.hal.science/tel-04391274/file/POLI_Lea_these_2023.pdf en eng HAL CCSD NNT: 2023SORUS409 tel-04391274 https://theses.hal.science/tel-04391274 https://theses.hal.science/tel-04391274/document https://theses.hal.science/tel-04391274/file/POLI_Lea_these_2023.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-04391274 Oceanography. Sorbonne Université, 2023. English. ⟨NNT : 2023SORUS409⟩ Physical Oceanography Dynamics Tropographic Waves Variability Topography Océanographie physique Dynamique Ondes topographiques Variabilité Topographie [SDU.STU.OC]Sciences of the Universe [physics]/Earth Sciences/Oceanography [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere info:eu-repo/semantics/doctoralThesis Theses 2023 ftinsu 2024-04-05T00:27:06Z The Argentine Basin (>5000 m) is home to rather unique oceanic structures of prime importance to the global circulation. In this thesis, we focus on elements of circulation (ocean waves and currents) constrained by topography. To the west, the Patagonian continental shelf of variable slope and direction hosts a variety of topographic waves. By combining outputs of a high-resolution reanalysis (GLORYS12), in-situ and satellite data, two types of sub-inertial waves were documented, fast and slow waves. Fast waves propagating along the Patagonian shelf break, with phase velocities between 1 m/s and 7 m/s, periods ranging from 5 to 130 days and wavelengths from 1,200 to 12,000 km. Their characteristics depend upon stratification, slope, shelf width, latitude and mean flow. High-frequency waves with periods between 5 and 40 days are often locally forced by strong variations of the zonal wind south of 47°S(Poli et al.,2020), whereas lower-frequency waves with periods between 40 and 130 days propagate from the equatorial Pacific to the tropical Atlantic (22°S, Poli et al.,2022). The Madden-Julian Oscillation (MJO) plays a key role in forcing these low-frequency waves in two ways. (a) By an oceanic teleconnection involving equatorial Kelvin waves reaching the American west coast, and (b) by an atmospheric teleconnection reinforcing southerly winds in the southeast Pacific. In addition, local winds, which are not necessarily linked to the MJO, modulate and trigger low-frequency waves (40-130 days period) in specific locations, such as the Brazil-Malvinas confluence and the Drake Passage. All these waves have an impact on along-shore currents : during the positive phase, the near-surface current is increased by around 0.1 m/s. In addition, these waves contribute to the supply of nutrients sustaining the high primary production on the Patagonian shelf. Slow waves propagate in the core of the Malvinas Current with phase velocities between 0.10 and 0.30 m/s, periods around 20, 60 and 100 days, and wavelengths ranging ... Doctoral or Postdoctoral Thesis Drake Passage Institut national des sciences de l'Univers: HAL-INSU |