2025_programme: Variability of acoustic signals near a Polar front at the Western Barents Sea

• Day: June 20, Friday
    Location / Time: D. CHLOE at 09:10 - 09:30
• Last minutes changes: -
• Session: 02. Acoustics in polar environments
  Organiser(s): Espen Storheim, Lora van Uffelen, Oskar Glowacki
  Chairperson(s): Lora Van Uffelen
• Lecture: Variability of acoustic signals near a Polar front at the Western Barents Sea [Invited]
  Paper ID: 2269
  Author(s): Altan Turgut, Jeffrey Schindall
  Presenter: Altan Turgut
  Abstract: Analysis of mid-frequency (0.7 to 4 kHz) acoustic data from the October 2022 Barents Sea experiment exhibited the effects of Polar front, tidal currents, and tidal heights on the acoustic travel-time fluctuations. Broadband acoustic model predictions revealed that the primary contribution to the travel-time fluctuations were due to the dynamics of a Polar front and tidal heights in the experimental area. Similar travel-time fluctuations were also calculated using HYCOM-predicted sound speed profiles capturing the dynamics of the Polar front. This implied that use of HYCOM would facilitate a prediction capability of acoustic travel-time fluctuations near a Polar front. In addition, up to 15 dB higher acoustic Transmission Loss (TL) was observed during several storm events. Measured acoustic Scintillation Index (SI) indicated a decrease of SI values during these storm events also. This SI decrease is due to the scattering of surface-interacting high-angle arrivals and reception of only more stable low-angle arrivals at a 10 km range. Modeling of this observation required additional scattering mechanisms due to bottom roughness and diffuse background internal waves.
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• Corresponding author: Dr Altan Turgut
  Affiliation: SoundOceanAI
  Country: United States