Sources and Levels of Ambient Ocean Sound near the Antarctic Peninsula
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- Sources and Levels of Ambient Ocean Sound near the Antarctic Peninsula
- Dziak, Robert P.
Bohnenstiehl, DelWayne R.
Stafford, Kathleen M.
Lee, Won Sang
Fowler, Mattew J.
Haxel, Joseph H.
Mellinger, David K.
- Science & Technology - Other Topics
- Ambient Ocean Sound; Antractic Peninsula; Hydroacoustics
- Issue Date
- Dziak, Robert P., et al. 2015. Sources and Levels of Ambient Ocean Sound near the Antarctic Peninsula. PLoS ONE, 10(4): 123425.
- Arrays of hydrophones were deployed within the Bransfield Strait and Scotia Sea (Antarctic Peninsula region) from 2005 to 2009 to record ambient ocean sound at frequencies of up to
125 and 500 Hz. Icequakes, which are broadband, short duration signals derived from fracturing of large free-floating icebergs, are a prominent feature of the ocean soundscape. Icequake
activity peaks during austral summer and is minimum during winter, likely following freeze-thaw cycles. Iceberg grounding and rapid disintegration also releases significant
acoustic energy, equivalent to large-scale geophysical events. Overall ambient sound levels can be as much as ~10？20 dB higher in the open, deep ocean of the Scotia Sea compared
to the relatively shallow Bransfield Strait. Noise levels become lowest during the austral winter, as sea-ice cover suppresses wind and wave noise. Ambient noise levels are
highest during austral spring and summer, as surface noise, ice cracking and biological activity intensifies. Vocalizations of blue (Balaenoptera musculus) and fin (B. physalus) whales
also dominate the long-term spectra records in the 15？28 and 89 Hz bands. Blue whale call energy is a maximum during austral summer-fall in the Drake Passage and Bransfield Strait
when ambient noise levels are a maximum and sea-ice cover is a minimum. Fin whale vocalizations were also most common during austral summer-early fall months in both the
Bransfield Strait and Scotia Sea. The hydrophone data overall do not show sustained anthropogenic sources (ships and airguns), likely due to low coastal traffic and the typically
rough weather and sea conditions of the Southern Ocean.
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