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Temperature-driven seasonal and longer term changes in spatially averaged deep ocean ambient sound at frequencies 63-125 Hz
- Source :
- The Journal of the Acoustical Society of America. 149(4)
- Publication Year :
- 2021
-
Abstract
- The soundscape of the Northeast Pacific Ocean is studied with emphasis on frequencies in the range 63–125 Hz. A 34-year (1964–1998) increase and seasonal fluctuations (1994–2006) are investigated. This is achieved by developing a simple relationship between the total radiated power of all ocean sound sources and the spatially averaged mean-square sound pressure in terms of the average source factor, source depth, and sea surface temperature (SST). The formula so derived is used to predict fluctuations in the sound level in the range 63–125 Hz with an amplitude of 1.2 dB and a period of 1 year associated with seasonal variations in the SST, which controls the amount of sound energy trapped in the sound fixing and ranging (SOFAR) channel. Also investigated is an observed 5 dB increase in the same frequency range in the Northeast Pacific Ocean during the late 20th century [Andrew, Howe, Mercer, and Dzieciuch (2002). ARLO 3, 65–70]. The increase is explained by the increase in the total number of ocean-going ships and their average gross tonnage.
- Subjects :
- 010302 applied physics
geography
geography.geographical_feature_category
Acoustics and Ultrasonics
Ambient noise level
02 engineering and technology
Effective radiated power
021001 nanoscience & nanotechnology
Atmospheric sciences
01 natural sciences
Deep sea
Sea surface temperature
Amplitude
Arts and Humanities (miscellaneous)
0103 physical sciences
Environmental science
Sound energy
0210 nano-technology
Sound pressure
Sound (geography)
Subjects
Details
- ISSN :
- 15208524
- Volume :
- 149
- Issue :
- 4
- Database :
- OpenAIRE
- Journal :
- The Journal of the Acoustical Society of America
- Accession number :
- edsair.doi.dedup.....6f27f312c73ea5f7e77a1738df263804