Turbulent convection into a linearly stratified fluid: the generation of ‘subsurface anticyclones’
Penetrative turbulent convection from a localized circular top source into a rotating, linearly stratified ambient fluid of strength N has been investigated in a laboratory tank. Initially, the induced three-dimensional convective flow penetrated rapidly into the stratified water column until it rea...
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1998
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Online Access: | http://dx.doi.org/10.1017/s002211209700743x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002211209700743X |
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crcambridgeupr:10.1017/s002211209700743x 2024-03-03T08:42:11+00:00 Turbulent convection into a linearly stratified fluid: the generation of ‘subsurface anticyclones’ NARIMOUSA, SIAVASH 1998 http://dx.doi.org/10.1017/s002211209700743x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002211209700743X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Journal of Fluid Mechanics volume 354, page 101-121 ISSN 0022-1120 1469-7645 Mechanical Engineering Mechanics of Materials Condensed Matter Physics journal-article 1998 crcambridgeupr https://doi.org/10.1017/s002211209700743x 2024-02-08T08:35:14Z Penetrative turbulent convection from a localized circular top source into a rotating, linearly stratified ambient fluid of strength N has been investigated in a laboratory tank. Initially, the induced three-dimensional convective flow penetrated rapidly into the stratified water column until it reached an equilibrium depth at which the convective flow began to propagate radially outward. At this stage, the usual cyclonic vortices were generated around the convection source at the edge of the radially propagating flow. Soon after, a thin ‘subsurface anticyclone’ was formed at the level of equilibrium depth beneath the convection source. Later, this anticyclone dominated the central part of the convective regime and did not allow new cyclones to be injected into the system. After reaching its maximum mean diameter D a / R ≈10( R 0; R ) 2/3 and swirl velocity v a ≈( B 0 R ) 1/3 , an anticyclone became unstable and split into two new vortices that left the area beneath the source, allowing a new anticyclone to form at its original place (here, R 0, R =( B 0 / f 3 R 2 ) 1/2 is the Rossby number based on R the radius of the source, B 0 is the surface negative buoyancy flux, and f is the Coriolis parameter). These observations provide crucial evidence that many of the ‘subsurface anticyclonic’ vortices detected in the stratified pycnocline of the central Arctic Ocean are indeed generated as a result of convective processes occurring in this region. Article in Journal/Newspaper Arctic Arctic Ocean Cambridge University Press Arctic Arctic Ocean Journal of Fluid Mechanics 354 101 121 |
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Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Mechanical Engineering Mechanics of Materials Condensed Matter Physics |
spellingShingle |
Mechanical Engineering Mechanics of Materials Condensed Matter Physics NARIMOUSA, SIAVASH Turbulent convection into a linearly stratified fluid: the generation of ‘subsurface anticyclones’ |
topic_facet |
Mechanical Engineering Mechanics of Materials Condensed Matter Physics |
description |
Penetrative turbulent convection from a localized circular top source into a rotating, linearly stratified ambient fluid of strength N has been investigated in a laboratory tank. Initially, the induced three-dimensional convective flow penetrated rapidly into the stratified water column until it reached an equilibrium depth at which the convective flow began to propagate radially outward. At this stage, the usual cyclonic vortices were generated around the convection source at the edge of the radially propagating flow. Soon after, a thin ‘subsurface anticyclone’ was formed at the level of equilibrium depth beneath the convection source. Later, this anticyclone dominated the central part of the convective regime and did not allow new cyclones to be injected into the system. After reaching its maximum mean diameter D a / R ≈10( R 0; R ) 2/3 and swirl velocity v a ≈( B 0 R ) 1/3 , an anticyclone became unstable and split into two new vortices that left the area beneath the source, allowing a new anticyclone to form at its original place (here, R 0, R =( B 0 / f 3 R 2 ) 1/2 is the Rossby number based on R the radius of the source, B 0 is the surface negative buoyancy flux, and f is the Coriolis parameter). These observations provide crucial evidence that many of the ‘subsurface anticyclonic’ vortices detected in the stratified pycnocline of the central Arctic Ocean are indeed generated as a result of convective processes occurring in this region. |
format |
Article in Journal/Newspaper |
author |
NARIMOUSA, SIAVASH |
author_facet |
NARIMOUSA, SIAVASH |
author_sort |
NARIMOUSA, SIAVASH |
title |
Turbulent convection into a linearly stratified fluid: the generation of ‘subsurface anticyclones’ |
title_short |
Turbulent convection into a linearly stratified fluid: the generation of ‘subsurface anticyclones’ |
title_full |
Turbulent convection into a linearly stratified fluid: the generation of ‘subsurface anticyclones’ |
title_fullStr |
Turbulent convection into a linearly stratified fluid: the generation of ‘subsurface anticyclones’ |
title_full_unstemmed |
Turbulent convection into a linearly stratified fluid: the generation of ‘subsurface anticyclones’ |
title_sort |
turbulent convection into a linearly stratified fluid: the generation of ‘subsurface anticyclones’ |
publisher |
Cambridge University Press (CUP) |
publishDate |
1998 |
url |
http://dx.doi.org/10.1017/s002211209700743x https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S002211209700743X |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Ocean |
genre_facet |
Arctic Arctic Ocean |
op_source |
Journal of Fluid Mechanics volume 354, page 101-121 ISSN 0022-1120 1469-7645 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s002211209700743x |
container_title |
Journal of Fluid Mechanics |
container_volume |
354 |
container_start_page |
101 |
op_container_end_page |
121 |
_version_ |
1792497651298598912 |