Measurements of open-water arctic ocean noise directionality and transport velocity
Measurements from bottom-mounted acoustic vector sensors, deployed seasonally between 2008 and 2014 on the shallow Beaufort Sea shelf along the Alaskan North Slope, are used to estimate the ambient sound pressure power spectral density, acoustic transport velocity of energy, and dominant azimuth bet...
Published in: | The Journal of the Acoustical Society of America |
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2021
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ftcdlib:oai:escholarship.org:ark:/13030/qt6tc0s8h1 2024-09-15T17:53:55+00:00 Measurements of open-water arctic ocean noise directionality and transport velocity Thode, Aaron M Norman, Robert G Conrad, Alexander S Tenorio-Hallé, Ludovic Blackwell, Susanna B Kim, Katherine H 1954 - 1966 2021-09-01 application/pdf https://escholarship.org/uc/item/6tc0s8h1 https://escholarship.org/content/qt6tc0s8h1/qt6tc0s8h1.pdf https://doi.org/10.1121/10.0006206 unknown eScholarship, University of California qt6tc0s8h1 https://escholarship.org/uc/item/6tc0s8h1 https://escholarship.org/content/qt6tc0s8h1/qt6tc0s8h1.pdf doi:10.1121/10.0006206 public The Journal of the Acoustical Society of America, vol 150, iss 3 Beaufort Sea article 2021 ftcdlib https://doi.org/10.1121/10.0006206 2024-06-28T06:28:21Z Measurements from bottom-mounted acoustic vector sensors, deployed seasonally between 2008 and 2014 on the shallow Beaufort Sea shelf along the Alaskan North Slope, are used to estimate the ambient sound pressure power spectral density, acoustic transport velocity of energy, and dominant azimuth between 25 and 450 Hz. Even during ice-free conditions, this region has unusual acoustic features when compared against other U.S. coastal regions. Two distinct regimes exist in the diffuse ambient noise environment: one with high pressure spectral density levels but low directionality, and another with lower spectral density levels but high directionality. The transition between the two states, which is invisible in traditional spectrograms, occurs between 73 and 79 dB re 1 μPa2/Hz at 100 Hz, with the transition region occurring at lower spectral levels at higher frequencies. Across a wide bandwidth, the high-directionality ambient noise consistently arrives from geographical azimuths between 0° and 30° from true north over multiple years and locations, with a seasonal interquartile range of 40° at low frequencies and high transport velocities. The long-term stability of this directional regime, which is believed to arise from the dominance of wind-driven sources along an east–west coastline, makes it an important feature of arctic ambient sound. Article in Journal/Newspaper Arctic Ocean Beaufort Sea University of California: eScholarship The Journal of the Acoustical Society of America 150 3 1954 1966 |
institution |
Open Polar |
collection |
University of California: eScholarship |
op_collection_id |
ftcdlib |
language |
unknown |
topic |
Beaufort Sea |
spellingShingle |
Beaufort Sea Thode, Aaron M Norman, Robert G Conrad, Alexander S Tenorio-Hallé, Ludovic Blackwell, Susanna B Kim, Katherine H Measurements of open-water arctic ocean noise directionality and transport velocity |
topic_facet |
Beaufort Sea |
description |
Measurements from bottom-mounted acoustic vector sensors, deployed seasonally between 2008 and 2014 on the shallow Beaufort Sea shelf along the Alaskan North Slope, are used to estimate the ambient sound pressure power spectral density, acoustic transport velocity of energy, and dominant azimuth between 25 and 450 Hz. Even during ice-free conditions, this region has unusual acoustic features when compared against other U.S. coastal regions. Two distinct regimes exist in the diffuse ambient noise environment: one with high pressure spectral density levels but low directionality, and another with lower spectral density levels but high directionality. The transition between the two states, which is invisible in traditional spectrograms, occurs between 73 and 79 dB re 1 μPa2/Hz at 100 Hz, with the transition region occurring at lower spectral levels at higher frequencies. Across a wide bandwidth, the high-directionality ambient noise consistently arrives from geographical azimuths between 0° and 30° from true north over multiple years and locations, with a seasonal interquartile range of 40° at low frequencies and high transport velocities. The long-term stability of this directional regime, which is believed to arise from the dominance of wind-driven sources along an east–west coastline, makes it an important feature of arctic ambient sound. |
format |
Article in Journal/Newspaper |
author |
Thode, Aaron M Norman, Robert G Conrad, Alexander S Tenorio-Hallé, Ludovic Blackwell, Susanna B Kim, Katherine H |
author_facet |
Thode, Aaron M Norman, Robert G Conrad, Alexander S Tenorio-Hallé, Ludovic Blackwell, Susanna B Kim, Katherine H |
author_sort |
Thode, Aaron M |
title |
Measurements of open-water arctic ocean noise directionality and transport velocity |
title_short |
Measurements of open-water arctic ocean noise directionality and transport velocity |
title_full |
Measurements of open-water arctic ocean noise directionality and transport velocity |
title_fullStr |
Measurements of open-water arctic ocean noise directionality and transport velocity |
title_full_unstemmed |
Measurements of open-water arctic ocean noise directionality and transport velocity |
title_sort |
measurements of open-water arctic ocean noise directionality and transport velocity |
publisher |
eScholarship, University of California |
publishDate |
2021 |
url |
https://escholarship.org/uc/item/6tc0s8h1 https://escholarship.org/content/qt6tc0s8h1/qt6tc0s8h1.pdf https://doi.org/10.1121/10.0006206 |
op_coverage |
1954 - 1966 |
genre |
Arctic Ocean Beaufort Sea |
genre_facet |
Arctic Ocean Beaufort Sea |
op_source |
The Journal of the Acoustical Society of America, vol 150, iss 3 |
op_relation |
qt6tc0s8h1 https://escholarship.org/uc/item/6tc0s8h1 https://escholarship.org/content/qt6tc0s8h1/qt6tc0s8h1.pdf doi:10.1121/10.0006206 |
op_rights |
public |
op_doi |
https://doi.org/10.1121/10.0006206 |
container_title |
The Journal of the Acoustical Society of America |
container_volume |
150 |
container_issue |
3 |
container_start_page |
1954 |
op_container_end_page |
1966 |
_version_ |
1810430053251547136 |