The physical oceanography of a broad, mid-latitude fjord : observations, seasonality and wind response of Fortune Bay (Newfoundland, Canada)
This thesis is concerned with the physical environment of Fortune Bay, a mid-latitude broad fjordlocated in Newfoundland, Canada. It presents the results of 2-years of continuous observations as well as of the analysis of historical records and numerical model simulations. Newly collected observatio...
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Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
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2022
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Online Access: | https://theses.hal.science/tel-04212424 https://theses.hal.science/tel-04212424/document https://theses.hal.science/tel-04212424/file/These-2022-SML-Oceanographie_physique_et_environnement-DONNET_Sebastien.pdf |
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ftccsdartic:oai:HAL:tel-04212424v1 2023-12-17T10:26:47+01:00 The physical oceanography of a broad, mid-latitude fjord : observations, seasonality and wind response of Fortune Bay (Newfoundland, Canada) Océanographie physique d'un large fjord des latitudes moyennes : observations, saisonnalité et réponse au vent de la baie de Fortune (Terre-Neuve, Canada) Donnet, Sébastien 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) Northwest Atlantic Fisheries Centre (NWAFC) Fisheries and Oceans Canada (DFO) Université de Bretagne occidentale - Brest Pascal Lazure 2022-12-16 https://theses.hal.science/tel-04212424 https://theses.hal.science/tel-04212424/document https://theses.hal.science/tel-04212424/file/These-2022-SML-Oceanographie_physique_et_environnement-DONNET_Sebastien.pdf en eng HAL CCSD NNT: 2022BRES0110 tel-04212424 https://theses.hal.science/tel-04212424 https://theses.hal.science/tel-04212424/document https://theses.hal.science/tel-04212424/file/These-2022-SML-Oceanographie_physique_et_environnement-DONNET_Sebastien.pdf info:eu-repo/semantics/OpenAccess https://theses.hal.science/tel-04212424 Geophysics [physics.geo-ph]. Université de Bretagne occidentale - Brest, 2022. English. ⟨NNT : 2022BRES0110⟩ Broad fjord Sub-arctic climate Wind Downwelling & upwelling Internal Kelvin wave Mooring Fjord Climat sub-arctique Vent Onde interne de Kelvin Mouillage [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] info:eu-repo/semantics/doctoralThesis Theses 2022 ftccsdartic 2023-11-18T23:43:37Z This thesis is concerned with the physical environment of Fortune Bay, a mid-latitude broad fjordlocated in Newfoundland, Canada. It presents the results of 2-years of continuous observations as well as of the analysis of historical records and numerical model simulations. Newly collected observations reveal the presence of coherent downwelling and upwelling signals, associated with vigorous alongshore currents,propagating cyclonically around the fjord. Along with the historical data, they also allow the determination of the seasonal climate of the water structure and some of its main forcing (wind, tides and freshwater runoff) as well as some measures of inter-annual variability. The implementation of a fully non-linear, 3-dimensional, numerical model allows the identification of the main process responsible for those dominant signals as well as their origin and some of their propagation characteristics.It is shown that Fortune Bay is seasonally and strongly stratified; influenced by local freshwater runoff, wind forcing and shelf input and that it is warmer than the shelf both at the surface and at intermediary depth due to saline stratification for the former and warm deep water renewal for the latter. Deep water renewal occurs bi-annually from two distinct water masses, one cold and fresh during the summer, the other warm and salty during the winter. Mean circulation is rather weak and so is the tidal influence. Currents are dominated by the weather band and are highly variable. The stratified season is dynamically dominated by transient baroclinic current pulses associated with downwelling and upwelling events. Those events are predominantly expressed as long internal Kelvin waves which are generated both locally and remotely. The generation of local and remote signals result in rather complex interactions which can enhance or diminish the amplitude of the response within the fjord. The effect of bay’ shape and dimension on the signals is suspected but was not clearly determined. Cette thèse porte sur ... Doctoral or Postdoctoral Thesis Arctic Arctique* Newfoundland Terre-Neuve Archive ouverte HAL (Hyper Article en Ligne, CCSD - Centre pour la Communication Scientifique Directe) Arctic Canada |
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 |
Broad fjord Sub-arctic climate Wind Downwelling & upwelling Internal Kelvin wave Mooring Fjord Climat sub-arctique Vent Onde interne de Kelvin Mouillage [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
spellingShingle |
Broad fjord Sub-arctic climate Wind Downwelling & upwelling Internal Kelvin wave Mooring Fjord Climat sub-arctique Vent Onde interne de Kelvin Mouillage [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] Donnet, Sébastien The physical oceanography of a broad, mid-latitude fjord : observations, seasonality and wind response of Fortune Bay (Newfoundland, Canada) |
topic_facet |
Broad fjord Sub-arctic climate Wind Downwelling & upwelling Internal Kelvin wave Mooring Fjord Climat sub-arctique Vent Onde interne de Kelvin Mouillage [SDU.STU.GP]Sciences of the Universe [physics]/Earth Sciences/Geophysics [physics.geo-ph] |
description |
This thesis is concerned with the physical environment of Fortune Bay, a mid-latitude broad fjordlocated in Newfoundland, Canada. It presents the results of 2-years of continuous observations as well as of the analysis of historical records and numerical model simulations. Newly collected observations reveal the presence of coherent downwelling and upwelling signals, associated with vigorous alongshore currents,propagating cyclonically around the fjord. Along with the historical data, they also allow the determination of the seasonal climate of the water structure and some of its main forcing (wind, tides and freshwater runoff) as well as some measures of inter-annual variability. The implementation of a fully non-linear, 3-dimensional, numerical model allows the identification of the main process responsible for those dominant signals as well as their origin and some of their propagation characteristics.It is shown that Fortune Bay is seasonally and strongly stratified; influenced by local freshwater runoff, wind forcing and shelf input and that it is warmer than the shelf both at the surface and at intermediary depth due to saline stratification for the former and warm deep water renewal for the latter. Deep water renewal occurs bi-annually from two distinct water masses, one cold and fresh during the summer, the other warm and salty during the winter. Mean circulation is rather weak and so is the tidal influence. Currents are dominated by the weather band and are highly variable. The stratified season is dynamically dominated by transient baroclinic current pulses associated with downwelling and upwelling events. Those events are predominantly expressed as long internal Kelvin waves which are generated both locally and remotely. The generation of local and remote signals result in rather complex interactions which can enhance or diminish the amplitude of the response within the fjord. The effect of bay’ shape and dimension on the signals is suspected but was not clearly determined. Cette thèse porte sur ... |
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) Northwest Atlantic Fisheries Centre (NWAFC) Fisheries and Oceans Canada (DFO) Université de Bretagne occidentale - Brest Pascal Lazure |
format |
Doctoral or Postdoctoral Thesis |
author |
Donnet, Sébastien |
author_facet |
Donnet, Sébastien |
author_sort |
Donnet, Sébastien |
title |
The physical oceanography of a broad, mid-latitude fjord : observations, seasonality and wind response of Fortune Bay (Newfoundland, Canada) |
title_short |
The physical oceanography of a broad, mid-latitude fjord : observations, seasonality and wind response of Fortune Bay (Newfoundland, Canada) |
title_full |
The physical oceanography of a broad, mid-latitude fjord : observations, seasonality and wind response of Fortune Bay (Newfoundland, Canada) |
title_fullStr |
The physical oceanography of a broad, mid-latitude fjord : observations, seasonality and wind response of Fortune Bay (Newfoundland, Canada) |
title_full_unstemmed |
The physical oceanography of a broad, mid-latitude fjord : observations, seasonality and wind response of Fortune Bay (Newfoundland, Canada) |
title_sort |
physical oceanography of a broad, mid-latitude fjord : observations, seasonality and wind response of fortune bay (newfoundland, canada) |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://theses.hal.science/tel-04212424 https://theses.hal.science/tel-04212424/document https://theses.hal.science/tel-04212424/file/These-2022-SML-Oceanographie_physique_et_environnement-DONNET_Sebastien.pdf |
geographic |
Arctic Canada |
geographic_facet |
Arctic Canada |
genre |
Arctic Arctique* Newfoundland Terre-Neuve |
genre_facet |
Arctic Arctique* Newfoundland Terre-Neuve |
op_source |
https://theses.hal.science/tel-04212424 Geophysics [physics.geo-ph]. Université de Bretagne occidentale - Brest, 2022. English. ⟨NNT : 2022BRES0110⟩ |
op_relation |
NNT: 2022BRES0110 tel-04212424 https://theses.hal.science/tel-04212424 https://theses.hal.science/tel-04212424/document https://theses.hal.science/tel-04212424/file/These-2022-SML-Oceanographie_physique_et_environnement-DONNET_Sebastien.pdf |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1785578513613455360 |