Arctic ocean long-term acoustic monitoring : ambient noise, environmental correlates, and transients north of Barrow, Alaska
The Arctic Ocean has experienced wide-spread decreases in sea ice concentrations that may impact various marine ecosystems. This study analyzes yearlong ocean acoustic recordings from north of Barrow, Alaska, to provide baseline measurements prior to possible increases in anthropogenic activities. I...
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ftcdlib:qt40r750n6 2023-05-15T14:24:39+02:00 Arctic ocean long-term acoustic monitoring : ambient noise, environmental correlates, and transients north of Barrow, Alaska Roth, Ethan H. 1 PDF (xiv, 100 p.) 2008-01-01 application/pdf http://www.escholarship.org/uc/item/40r750n6 http://n2t.net/ark:/20775/bb2628981z unknown eScholarship, University of California http://www.escholarship.org/uc/item/40r750n6 qt40r750n6 http://n2t.net/ark:/20775/bb2628981z public Roth, Ethan H.(2008). Arctic ocean long-term acoustic monitoring : ambient noise, environmental correlates, and transients north of Barrow, Alaska. UC San Diego: Retrieved from: http://www.escholarship.org/uc/item/40r750n6 UCSD. Engineering science (Applied ocean sciences) (Discipline) Dissertations Academic dissertation 2008 ftcdlib 2016-04-02T18:39:17Z The Arctic Ocean has experienced wide-spread decreases in sea ice concentrations that may impact various marine ecosystems. This study analyzes yearlong ocean acoustic recordings from north of Barrow, Alaska, to provide baseline measurements prior to possible increases in anthropogenic activities. In September 2006, two autonomous High-frequency Acoustic Recording Packages (HARPs) were deployed to the seafloor (250m), where sound was continuously recorded by hydrophones for nine months. Ice conditions during the recordings included open water, pack ice formation, shore-fast canopies, and thermal breakup, providing a wide range of Arctic Ocean acoustic measurements. Spectral-averaging was used to determine received sound-pressure levels. Across the low-frequency band, fall was the noisiest season, reaching 87dB re [mu]Pa between 20-60Hz, while 10% of October was exposed to noise above 130dB re [mu]Pa at 10Hz and 112dB re [mu]Pa between 20-30Hz; seismic airguns were present from September to November. Acoustic data was compared with sea ice concentration and wind speed; during summer and fall, sound-pressure spectrum levels correlate directly with high wind speeds, typically indicative of low-pressure atmospheric events. Throughout winter and spring, strong winds and thermal fracturing in sea ice opens leads, resulting in correlations with spectral energy-peaks. Bioacoustic recordings of cetaceans and pinnipeds were analyzed using long-term spectral-averages to determine presence or absence on an hourly basis. Combined with ancillary measurements, long-term acoustic monitoring is an effective tool for observing changing levels of ambient sound related to sea ice dynamics, environmental noise- generating mechanisms, and anthropogenic noise, while simultaneously detecting marine mammals Doctoral or Postdoctoral Thesis Arctic Arctic Arctic Ocean Barrow Sea ice Alaska University of California: eScholarship Arctic Arctic Ocean |
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University of California: eScholarship |
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ftcdlib |
language |
unknown |
topic |
UCSD. Engineering science (Applied ocean sciences) (Discipline) Dissertations Academic |
spellingShingle |
UCSD. Engineering science (Applied ocean sciences) (Discipline) Dissertations Academic Roth, Ethan H. Arctic ocean long-term acoustic monitoring : ambient noise, environmental correlates, and transients north of Barrow, Alaska |
topic_facet |
UCSD. Engineering science (Applied ocean sciences) (Discipline) Dissertations Academic |
description |
The Arctic Ocean has experienced wide-spread decreases in sea ice concentrations that may impact various marine ecosystems. This study analyzes yearlong ocean acoustic recordings from north of Barrow, Alaska, to provide baseline measurements prior to possible increases in anthropogenic activities. In September 2006, two autonomous High-frequency Acoustic Recording Packages (HARPs) were deployed to the seafloor (250m), where sound was continuously recorded by hydrophones for nine months. Ice conditions during the recordings included open water, pack ice formation, shore-fast canopies, and thermal breakup, providing a wide range of Arctic Ocean acoustic measurements. Spectral-averaging was used to determine received sound-pressure levels. Across the low-frequency band, fall was the noisiest season, reaching 87dB re [mu]Pa between 20-60Hz, while 10% of October was exposed to noise above 130dB re [mu]Pa at 10Hz and 112dB re [mu]Pa between 20-30Hz; seismic airguns were present from September to November. Acoustic data was compared with sea ice concentration and wind speed; during summer and fall, sound-pressure spectrum levels correlate directly with high wind speeds, typically indicative of low-pressure atmospheric events. Throughout winter and spring, strong winds and thermal fracturing in sea ice opens leads, resulting in correlations with spectral energy-peaks. Bioacoustic recordings of cetaceans and pinnipeds were analyzed using long-term spectral-averages to determine presence or absence on an hourly basis. Combined with ancillary measurements, long-term acoustic monitoring is an effective tool for observing changing levels of ambient sound related to sea ice dynamics, environmental noise- generating mechanisms, and anthropogenic noise, while simultaneously detecting marine mammals |
format |
Doctoral or Postdoctoral Thesis |
author |
Roth, Ethan H. |
author_facet |
Roth, Ethan H. |
author_sort |
Roth, Ethan H. |
title |
Arctic ocean long-term acoustic monitoring : ambient noise, environmental correlates, and transients north of Barrow, Alaska |
title_short |
Arctic ocean long-term acoustic monitoring : ambient noise, environmental correlates, and transients north of Barrow, Alaska |
title_full |
Arctic ocean long-term acoustic monitoring : ambient noise, environmental correlates, and transients north of Barrow, Alaska |
title_fullStr |
Arctic ocean long-term acoustic monitoring : ambient noise, environmental correlates, and transients north of Barrow, Alaska |
title_full_unstemmed |
Arctic ocean long-term acoustic monitoring : ambient noise, environmental correlates, and transients north of Barrow, Alaska |
title_sort |
arctic ocean long-term acoustic monitoring : ambient noise, environmental correlates, and transients north of barrow, alaska |
publisher |
eScholarship, University of California |
publishDate |
2008 |
url |
http://www.escholarship.org/uc/item/40r750n6 http://n2t.net/ark:/20775/bb2628981z |
op_coverage |
1 PDF (xiv, 100 p.) |
geographic |
Arctic Arctic Ocean |
geographic_facet |
Arctic Arctic Ocean |
genre |
Arctic Arctic Arctic Ocean Barrow Sea ice Alaska |
genre_facet |
Arctic Arctic Arctic Ocean Barrow Sea ice Alaska |
op_source |
Roth, Ethan H.(2008). Arctic ocean long-term acoustic monitoring : ambient noise, environmental correlates, and transients north of Barrow, Alaska. UC San Diego: Retrieved from: http://www.escholarship.org/uc/item/40r750n6 |
op_relation |
http://www.escholarship.org/uc/item/40r750n6 qt40r750n6 http://n2t.net/ark:/20775/bb2628981z |
op_rights |
public |
_version_ |
1766297087597608960 |