Temporal and spatial characteristics of the Beaufort Sea ambient noise environment
Underwater ambient noise from the Beaufort Sea, collected in March 2016, is analyzed to investigate the effect that environmental changes in the region have on the spatial and temporal characteristics of the ice-generated ambient noise. In particular, the influx of warm Pacific water, so called the...
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ftmit:oai:dspace.mit.edu:1721.1/154269 2024-05-19T07:38:13+00:00 Temporal and spatial characteristics of the Beaufort Sea ambient noise environment Chen, R. Schmidt, H. 2024-04-23T17:48:39Z application/pdf https://hdl.handle.net/1721.1/154269 en eng Acoustical Society of America 10.1121/10.0002955 The Journal of the Acoustical Society of America 0001-4966 1520-8524 https://hdl.handle.net/1721.1/154269 R. Chen, H. Schmidt; Temporal and spatial characteristics of the Beaufort Sea ambient noise environment. J. Acoust. Soc. Am. 1 December 2020; 148 (6): 3928–3941. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. Acoustical Society of America Article http://purl.org/eprint/type/JournalArticle 2024 ftmit 2024-04-30T23:30:25Z Underwater ambient noise from the Beaufort Sea, collected in March 2016, is analyzed to investigate the effect that environmental changes in the region have on the spatial and temporal characteristics of the ice-generated ambient noise. In particular, the influx of warm Pacific water, so called the Beaufort Lens, has dramatically altered the level and vertical directionality of ambient noise, creating a low noise zone in the ∼75–250 m depth interval with a noise notch at low grazing angles. It is also demonstrated how the observed noise vertical directionality is consistent with ice-mechanical activity along an active pressure ridge ∼30–50 km from the recording array, as shown by satellite imagery. The discrete ranges to this ice activity explain the peak arrival angles between −10 to −15 degrees in noise vertical directionality, as well as the horizontal noise notch. Transient noise events associated with the ice activity are analyzed using an image processing approach with hierarchical clustering applied to the recorded spectrograms. The observed events are grouped into three categories—short-time-broadband, long-time-narrowband, and long-time-broadband—each likely generated through a different mechanism by the ice cover. The spectral and temporal distribution of these transients are discussed. Article in Journal/Newspaper Beaufort Sea DSpace@MIT (Massachusetts Institute of Technology) |
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DSpace@MIT (Massachusetts Institute of Technology) |
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language |
English |
description |
Underwater ambient noise from the Beaufort Sea, collected in March 2016, is analyzed to investigate the effect that environmental changes in the region have on the spatial and temporal characteristics of the ice-generated ambient noise. In particular, the influx of warm Pacific water, so called the Beaufort Lens, has dramatically altered the level and vertical directionality of ambient noise, creating a low noise zone in the ∼75–250 m depth interval with a noise notch at low grazing angles. It is also demonstrated how the observed noise vertical directionality is consistent with ice-mechanical activity along an active pressure ridge ∼30–50 km from the recording array, as shown by satellite imagery. The discrete ranges to this ice activity explain the peak arrival angles between −10 to −15 degrees in noise vertical directionality, as well as the horizontal noise notch. Transient noise events associated with the ice activity are analyzed using an image processing approach with hierarchical clustering applied to the recorded spectrograms. The observed events are grouped into three categories—short-time-broadband, long-time-narrowband, and long-time-broadband—each likely generated through a different mechanism by the ice cover. The spectral and temporal distribution of these transients are discussed. |
format |
Article in Journal/Newspaper |
author |
Chen, R. Schmidt, H. |
spellingShingle |
Chen, R. Schmidt, H. Temporal and spatial characteristics of the Beaufort Sea ambient noise environment |
author_facet |
Chen, R. Schmidt, H. |
author_sort |
Chen, R. |
title |
Temporal and spatial characteristics of the Beaufort Sea ambient noise environment |
title_short |
Temporal and spatial characteristics of the Beaufort Sea ambient noise environment |
title_full |
Temporal and spatial characteristics of the Beaufort Sea ambient noise environment |
title_fullStr |
Temporal and spatial characteristics of the Beaufort Sea ambient noise environment |
title_full_unstemmed |
Temporal and spatial characteristics of the Beaufort Sea ambient noise environment |
title_sort |
temporal and spatial characteristics of the beaufort sea ambient noise environment |
publisher |
Acoustical Society of America |
publishDate |
2024 |
url |
https://hdl.handle.net/1721.1/154269 |
genre |
Beaufort Sea |
genre_facet |
Beaufort Sea |
op_source |
Acoustical Society of America |
op_relation |
10.1121/10.0002955 The Journal of the Acoustical Society of America 0001-4966 1520-8524 https://hdl.handle.net/1721.1/154269 R. Chen, H. Schmidt; Temporal and spatial characteristics of the Beaufort Sea ambient noise environment. J. Acoust. Soc. Am. 1 December 2020; 148 (6): 3928–3941. |
op_rights |
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. |
_version_ |
1799477623834804224 |