Deep-ocean inertial subrange small bandwidth coherence and Ozmidov-frequency separation
The inertial subrange of turbulence in a density stratified environment is the transition from internal waves to isotropic turbulence, but it is unclear how to interpret its extension to anisotropic “stratified” turbulence. Knowledge about stratified turbulence is relevant for the dispersal of suspe...
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craippubl:10.1063/1.5099005 2024-05-12T08:08:44+00:00 Deep-ocean inertial subrange small bandwidth coherence and Ozmidov-frequency separation van Haren, Hans Nederlandse Organisatie voor Wetenschappelijk Onderzoek 2019 http://dx.doi.org/10.1063/1.5099005 https://pubs.aip.org/aip/pof/article-pdf/doi/10.1063/1.5099005/15656105/066603_1_online.pdf en eng AIP Publishing Physics of Fluids volume 31, issue 6 ISSN 1070-6631 1089-7666 Condensed Matter Physics Fluid Flow and Transfer Processes Mechanics of Materials Computational Mechanics Mechanical Engineering journal-article 2019 craippubl https://doi.org/10.1063/1.5099005 2024-04-18T06:44:18Z The inertial subrange of turbulence in a density stratified environment is the transition from internal waves to isotropic turbulence, but it is unclear how to interpret its extension to anisotropic “stratified” turbulence. Knowledge about stratified turbulence is relevant for the dispersal of suspended matter in geophysical flows, such as in most of the ocean. For studying internal-wave-induced ocean-turbulence, moored high-resolution temperature (T-)sensors are used. Spectra from observations on episodic quasiconvective internal wave breaking above a steep slope of large seamount Josephine in the Northeast-Atlantic demonstrate an inertial subrange that can be separated in two parts: A large-scale part with relatively coherent portions adjacent to less coherent portions and a small-scale part that is smoothly continuous (to within standard error). The separation is close to the Ozmidov frequency and coincides with the transition from anisotropic/quasideterministic stratified turbulence to isotropic/stochastic inertial convective motions as inferred from a comparison of vertical and horizontal cospectra. These observations contrast with T-sensor observations of shear-dominated internal wave breaking in an equally turbulent environment above the slope of a small Mid-Atlantic ridge-crest, which demonstrate a stochastic inertial subrange throughout. Article in Journal/Newspaper Northeast Atlantic AIP Publishing Josephine ENVELOPE(-152.800,-152.800,-77.550,-77.550) Mid-Atlantic Ridge Physics of Fluids 31 6 |
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Open Polar |
collection |
AIP Publishing |
op_collection_id |
craippubl |
language |
English |
topic |
Condensed Matter Physics Fluid Flow and Transfer Processes Mechanics of Materials Computational Mechanics Mechanical Engineering |
spellingShingle |
Condensed Matter Physics Fluid Flow and Transfer Processes Mechanics of Materials Computational Mechanics Mechanical Engineering van Haren, Hans Deep-ocean inertial subrange small bandwidth coherence and Ozmidov-frequency separation |
topic_facet |
Condensed Matter Physics Fluid Flow and Transfer Processes Mechanics of Materials Computational Mechanics Mechanical Engineering |
description |
The inertial subrange of turbulence in a density stratified environment is the transition from internal waves to isotropic turbulence, but it is unclear how to interpret its extension to anisotropic “stratified” turbulence. Knowledge about stratified turbulence is relevant for the dispersal of suspended matter in geophysical flows, such as in most of the ocean. For studying internal-wave-induced ocean-turbulence, moored high-resolution temperature (T-)sensors are used. Spectra from observations on episodic quasiconvective internal wave breaking above a steep slope of large seamount Josephine in the Northeast-Atlantic demonstrate an inertial subrange that can be separated in two parts: A large-scale part with relatively coherent portions adjacent to less coherent portions and a small-scale part that is smoothly continuous (to within standard error). The separation is close to the Ozmidov frequency and coincides with the transition from anisotropic/quasideterministic stratified turbulence to isotropic/stochastic inertial convective motions as inferred from a comparison of vertical and horizontal cospectra. These observations contrast with T-sensor observations of shear-dominated internal wave breaking in an equally turbulent environment above the slope of a small Mid-Atlantic ridge-crest, which demonstrate a stochastic inertial subrange throughout. |
author2 |
Nederlandse Organisatie voor Wetenschappelijk Onderzoek |
format |
Article in Journal/Newspaper |
author |
van Haren, Hans |
author_facet |
van Haren, Hans |
author_sort |
van Haren, Hans |
title |
Deep-ocean inertial subrange small bandwidth coherence and Ozmidov-frequency separation |
title_short |
Deep-ocean inertial subrange small bandwidth coherence and Ozmidov-frequency separation |
title_full |
Deep-ocean inertial subrange small bandwidth coherence and Ozmidov-frequency separation |
title_fullStr |
Deep-ocean inertial subrange small bandwidth coherence and Ozmidov-frequency separation |
title_full_unstemmed |
Deep-ocean inertial subrange small bandwidth coherence and Ozmidov-frequency separation |
title_sort |
deep-ocean inertial subrange small bandwidth coherence and ozmidov-frequency separation |
publisher |
AIP Publishing |
publishDate |
2019 |
url |
http://dx.doi.org/10.1063/1.5099005 https://pubs.aip.org/aip/pof/article-pdf/doi/10.1063/1.5099005/15656105/066603_1_online.pdf |
long_lat |
ENVELOPE(-152.800,-152.800,-77.550,-77.550) |
geographic |
Josephine Mid-Atlantic Ridge |
geographic_facet |
Josephine Mid-Atlantic Ridge |
genre |
Northeast Atlantic |
genre_facet |
Northeast Atlantic |
op_source |
Physics of Fluids volume 31, issue 6 ISSN 1070-6631 1089-7666 |
op_doi |
https://doi.org/10.1063/1.5099005 |
container_title |
Physics of Fluids |
container_volume |
31 |
container_issue |
6 |
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1798851846064832512 |