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Sounds from airguns and fin whales recorded in the mid-Atlantic Ocean, 1999-2009

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  • Between 1999 and 2009, autonomous hydrophones were deployed to monitor seismic activity from 16° N to 50° N along the Mid-Atlantic Ridge. These data were examined for airgun sounds produced during offshore surveys for oil and gas deposits, as well as the 20 Hz pulse sounds from fin whales, which may be masked by airgun noise. An automatic detection algorithm was used to identify airgun sound patterns, and fin whale calling levels were summarized via long-term spectral analysis. Both airgun and fin whale sounds were recorded at all sites. Fin whale calling rates were higher at sites north of 32° N, increased during the late summer and fall months at all sites, and peaked during the winter months, a time when airgun noise was often prevalent. Seismic survey vessels were acoustically located off the coasts of three major areas: Newfoundland, northeast Brazil, and Senegal and Mauritania in West Africa. In some cases, airgun sounds were recorded almost 4000 km from the survey vessel in areas that are likely occupied by fin whales, and at some locations airgun sounds were recorded more than 80% days/month for more than 12 consecutive months.
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  • Nieukirk, S. L., Mellinger, D. K., Moore, S. E., Klinck, K., Dziak, R. P., & Goslin, J. J. (2012, February). Sounds from airguns and fin whales recorded in the mid-Atlantic Ocean, 1999-2009. Journal of the Acoustical Society of America, 131(2), 1102-1112. doi:10.1121/1.3672648
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  • 131
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  • 2
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  • Funding for the deployment, maintenance, and data analysis for the hydrophone array along the Mid-Atlantic Ridge was provided by National Science Foundation Grants to R.P.D. No. OCE-9811575, No. OCE-0137164, and No. OCE-0201692, and by the Institut National des Sciences de l'Univers (a department of the Centre National de la recherche Scientifique, France). Analysis and writing were supported by Office of Naval Research Grants No. N00014-00-F-0395 and No. N00014-03-1-0099, Naval Postgraduate School Grants No. N00244-10-1-0047 and No. N00244-11-1-0026, and NOAA NMFS Contract No. AB133F08SE4903 to D.K.M. Development of the hydrophone instruments was supported by in-kind funding from NOAA PMEL. This is PMEL contribution #3515.
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