2019_programme: FLUCTUATION DRIVERS AND VARIABILITY OF VERY LOW FREQUENCY LONG TERM OCEAN AMBIENT NOISE

• Session: 08. Comprehensive nuclear test-ban treaty monitoring
  Organiser(s): Haralabus George, Zampolli Mario, Nielsen Peter
• Lecture: FLUCTUATION DRIVERS AND VARIABILITY OF VERY LOW FREQUENCY LONG TERM OCEAN AMBIENT NOISE [invited]
  Paper ID: 883
  Author(s): Eller Anthony I., Bradley David L.
  Presenter: Eller Anthony
  Presentation type: oral
  Abstract: Long term ocean acoustic noise data from widely separated measurement sites, spanning periods of up to 15 years, have been made available for analysis by the Comprehensive Test Ban Treaty Organization (CTBTO). Raw noise data, sampled at a rate of 250 Hz, were Fourier Transformed in 10-sec segments to provide noise spectra with a resolution of 0.1 Hz over long periods of time. Low-frequency spectrum level time series data were examined for two purposes: (1) to identify long term statistical trends that might signal changes in climate, and (2) to identify natural or man-induced processes that drive observed fluctuations in noise spectral level. Noise levels in the 1 – 5 Hz part of the spectrum are thought to be relatively free of noise from shipping and marine life. As such, noise fluctuations in this band tend to be driven by natural processes, such as weather, natural seismic activity and sun and moon positions. The statistical behavior of noise at these low frequencies has unique properties, which may provide the opportunity to confidently isolate specific noise forcing functions, allowing interpretation of the time change of oceanic sea noise.\n\n
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• Corresponding author: Dr Eller Anthony
  Affiliation: Applied Ocean Sciences
  Country: United States
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