Monitoring polynyas with Ocean Acoustic Tomography: a feasibility study in Terra Nova Bay
This study looks at the feasibility of using Ocean Acoustic Tomography for long-term monitoring of polynyas using both observations in Terra Nova Bay polynya (Ross Sea) and simulations with a range dependent, multi-layered adiabatic normal mode acoustic propagation model. The summer sound speed prof...
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Online Access: | http://dx.doi.org/10.1017/s0954102003001068 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102003001068 |
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crcambridgeupr:10.1017/s0954102003001068 2024-03-03T08:39:25+00:00 Monitoring polynyas with Ocean Acoustic Tomography: a feasibility study in Terra Nova Bay DE MARINIS, ENRICO PICCO, PAOLA MELONI, ROBERTO 2003 http://dx.doi.org/10.1017/s0954102003001068 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102003001068 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 15, issue 1, page 63-75 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2003 crcambridgeupr https://doi.org/10.1017/s0954102003001068 2024-02-08T08:46:24Z This study looks at the feasibility of using Ocean Acoustic Tomography for long-term monitoring of polynyas using both observations in Terra Nova Bay polynya (Ross Sea) and simulations with a range dependent, multi-layered adiabatic normal mode acoustic propagation model. The summer sound speed profile is characterized by surface values of around 1450 m s −1 , a minimum of 1441 m s −1 around 50 m depth and a linear increase with a 0.016 s −1 slope. Thus, the sound propagation is apparently ducted in the near surface layer and is refracted upward below it. During winter, due to water cooling and mixing processes, the subsurface minimum disappears, the surface sound speed is about 1440 m s −1 and no near surface layer ducted propagation occurs. Because of the specificity of the Terra Nova Bay seasonal sound speed profile and to cope with both deep and shelf water applicability, the feasibility study of acoustic inversion was undertaken using normal mode Match Field Tomography instead of the more classical travel-time inversion. The results from simulations demonstrate that ocean acoustic tomography is able to reproduce quite well the vertical sound speed profile, in particular the temporal evolution of summer stratification and winter mixing processes, thus providing information on the upper layer, where direct measurements are not possible. Article in Journal/Newspaper Antarctic Science Ross Sea Cambridge University Press Ross Sea Terra Nova Bay Antarctic Science 15 1 63 75 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography DE MARINIS, ENRICO PICCO, PAOLA MELONI, ROBERTO Monitoring polynyas with Ocean Acoustic Tomography: a feasibility study in Terra Nova Bay |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
This study looks at the feasibility of using Ocean Acoustic Tomography for long-term monitoring of polynyas using both observations in Terra Nova Bay polynya (Ross Sea) and simulations with a range dependent, multi-layered adiabatic normal mode acoustic propagation model. The summer sound speed profile is characterized by surface values of around 1450 m s −1 , a minimum of 1441 m s −1 around 50 m depth and a linear increase with a 0.016 s −1 slope. Thus, the sound propagation is apparently ducted in the near surface layer and is refracted upward below it. During winter, due to water cooling and mixing processes, the subsurface minimum disappears, the surface sound speed is about 1440 m s −1 and no near surface layer ducted propagation occurs. Because of the specificity of the Terra Nova Bay seasonal sound speed profile and to cope with both deep and shelf water applicability, the feasibility study of acoustic inversion was undertaken using normal mode Match Field Tomography instead of the more classical travel-time inversion. The results from simulations demonstrate that ocean acoustic tomography is able to reproduce quite well the vertical sound speed profile, in particular the temporal evolution of summer stratification and winter mixing processes, thus providing information on the upper layer, where direct measurements are not possible. |
format |
Article in Journal/Newspaper |
author |
DE MARINIS, ENRICO PICCO, PAOLA MELONI, ROBERTO |
author_facet |
DE MARINIS, ENRICO PICCO, PAOLA MELONI, ROBERTO |
author_sort |
DE MARINIS, ENRICO |
title |
Monitoring polynyas with Ocean Acoustic Tomography: a feasibility study in Terra Nova Bay |
title_short |
Monitoring polynyas with Ocean Acoustic Tomography: a feasibility study in Terra Nova Bay |
title_full |
Monitoring polynyas with Ocean Acoustic Tomography: a feasibility study in Terra Nova Bay |
title_fullStr |
Monitoring polynyas with Ocean Acoustic Tomography: a feasibility study in Terra Nova Bay |
title_full_unstemmed |
Monitoring polynyas with Ocean Acoustic Tomography: a feasibility study in Terra Nova Bay |
title_sort |
monitoring polynyas with ocean acoustic tomography: a feasibility study in terra nova bay |
publisher |
Cambridge University Press (CUP) |
publishDate |
2003 |
url |
http://dx.doi.org/10.1017/s0954102003001068 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102003001068 |
geographic |
Ross Sea Terra Nova Bay |
geographic_facet |
Ross Sea Terra Nova Bay |
genre |
Antarctic Science Ross Sea |
genre_facet |
Antarctic Science Ross Sea |
op_source |
Antarctic Science volume 15, issue 1, page 63-75 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102003001068 |
container_title |
Antarctic Science |
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15 |
container_issue |
1 |
container_start_page |
63 |
op_container_end_page |
75 |
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1792494954009853952 |