Internal wave propagation in the Arctic Ocean
The propagation of internal gravity waves in the Arctic Ocean is studied using direct and indirect observations, reanalysis data and two numerical models. I focus on how stratification modifies wave propagation and its connection to the pathways of internal wave energy from the surface to the deep o...
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Universität Bremen
2024
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/8200 2024-09-15T17:53:10+00:00 Internal wave propagation in the Arctic Ocean Bracamontes Ramírez, Joel Walter, Maren Olbers, Dirk 2024-06-10 application/pdf https://media.suub.uni-bremen.de/handle/elib/8200 https://doi.org/10.26092/elib/3234 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib82000 eng eng Universität Bremen Fachbereich 01: Physik/Elektrotechnik (FB 01) https://media.suub.uni-bremen.de/handle/elib/8200 https://doi.org/10.26092/elib/3234 doi:10.26092/elib/3234 urn:nbn:de:gbv:46-elib82000 info:eu-repo/semantics/openAccess CC BY 4.0 (Attribution) https://creativecommons.org/licenses/by/4.0/ Internal waves Arctic Ocean Wave Propagation 500 500 Science ddc:500 Dissertation doctoralThesis 2024 ftsubbremen https://doi.org/10.26092/elib/3234 2024-09-03T23:49:28Z The propagation of internal gravity waves in the Arctic Ocean is studied using direct and indirect observations, reanalysis data and two numerical models. I focus on how stratification modifies wave propagation and its connection to the pathways of internal wave energy from the surface to the deep ocean. Understanding internal wave propagation in the Arctic Ocean is crucial for better understanding wave-driven mixing and its implications for climate projections. Therefore, three specific aspects of internal wave propagation have been addressed in this thesis. First, the transient transmission of a wave packet across a density staircase is studied using a 2D Boussinesq model. A series of simulations with fixed wave frequency and varying horizontal wave number are carried out. The results show that the incident wave excites trapped modes by a near resonance mechanism, which slowly transfer energy above and below the staircase. A theoretical prediction was made using typical values for thermohaline staircases and internal waves in the Arctic Ocean. Surface-generated near-inertial internal waves that excite trapped modes should have a critical horizontal wavelength of ∼ 400 m. For higher-frequency non-hydrostatic waves, this critical horizontal wavelength decreases to ∼ 80 m. Such waves are likely to be generated by wind-driven ice floes. Secondly, the existence of turning depths for near-inertial internal waves and their effect on wind-driven deep mixing is assessed using 10 years of temperature and salinity profiles in the Canadian Basin. It is found that turning depths exist in the deep Canadian Basin at ∼ 2750 m, but with decreasing distance from the bottom towards the slope. A subsequent discussion focuses on the possible topographic interaction of internal wave reflection and dissipation, especially where turning depths are shallow and above the slope, where the evanescent perturbation of the internal waves can still interact with the topography. Finally, direct observations of near-inertial internal waves are ... Doctoral or Postdoctoral Thesis Arctic Ocean Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
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Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
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ftsubbremen |
language |
English |
topic |
Internal waves Arctic Ocean Wave Propagation 500 500 Science ddc:500 |
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Internal waves Arctic Ocean Wave Propagation 500 500 Science ddc:500 Bracamontes Ramírez, Joel Internal wave propagation in the Arctic Ocean |
topic_facet |
Internal waves Arctic Ocean Wave Propagation 500 500 Science ddc:500 |
description |
The propagation of internal gravity waves in the Arctic Ocean is studied using direct and indirect observations, reanalysis data and two numerical models. I focus on how stratification modifies wave propagation and its connection to the pathways of internal wave energy from the surface to the deep ocean. Understanding internal wave propagation in the Arctic Ocean is crucial for better understanding wave-driven mixing and its implications for climate projections. Therefore, three specific aspects of internal wave propagation have been addressed in this thesis. First, the transient transmission of a wave packet across a density staircase is studied using a 2D Boussinesq model. A series of simulations with fixed wave frequency and varying horizontal wave number are carried out. The results show that the incident wave excites trapped modes by a near resonance mechanism, which slowly transfer energy above and below the staircase. A theoretical prediction was made using typical values for thermohaline staircases and internal waves in the Arctic Ocean. Surface-generated near-inertial internal waves that excite trapped modes should have a critical horizontal wavelength of ∼ 400 m. For higher-frequency non-hydrostatic waves, this critical horizontal wavelength decreases to ∼ 80 m. Such waves are likely to be generated by wind-driven ice floes. Secondly, the existence of turning depths for near-inertial internal waves and their effect on wind-driven deep mixing is assessed using 10 years of temperature and salinity profiles in the Canadian Basin. It is found that turning depths exist in the deep Canadian Basin at ∼ 2750 m, but with decreasing distance from the bottom towards the slope. A subsequent discussion focuses on the possible topographic interaction of internal wave reflection and dissipation, especially where turning depths are shallow and above the slope, where the evanescent perturbation of the internal waves can still interact with the topography. Finally, direct observations of near-inertial internal waves are ... |
author2 |
Walter, Maren Olbers, Dirk |
format |
Doctoral or Postdoctoral Thesis |
author |
Bracamontes Ramírez, Joel |
author_facet |
Bracamontes Ramírez, Joel |
author_sort |
Bracamontes Ramírez, Joel |
title |
Internal wave propagation in the Arctic Ocean |
title_short |
Internal wave propagation in the Arctic Ocean |
title_full |
Internal wave propagation in the Arctic Ocean |
title_fullStr |
Internal wave propagation in the Arctic Ocean |
title_full_unstemmed |
Internal wave propagation in the Arctic Ocean |
title_sort |
internal wave propagation in the arctic ocean |
publisher |
Universität Bremen |
publishDate |
2024 |
url |
https://media.suub.uni-bremen.de/handle/elib/8200 https://doi.org/10.26092/elib/3234 https://nbn-resolving.org/urn:nbn:de:gbv:46-elib82000 |
genre |
Arctic Ocean |
genre_facet |
Arctic Ocean |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/8200 https://doi.org/10.26092/elib/3234 doi:10.26092/elib/3234 urn:nbn:de:gbv:46-elib82000 |
op_rights |
info:eu-repo/semantics/openAccess CC BY 4.0 (Attribution) https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.26092/elib/3234 |
_version_ |
1810295162975289344 |