2019_programme: A STUDY ON THE YEARLONG RECORD OF SOUND PROPAGATION FROM THE CANADA BASIN TO THE CHUKCHI SHELF

Back


  • Session: 09. Acoustics in polar environments
    Organiser(s): Tegowski Jaroslaw
  • Lecture: A STUDY ON THE YEARLONG RECORD OF SOUND PROPAGATION FROM THE CANADA BASIN TO THE CHUKCHI SHELF
    Paper ID: 851
    Author(s): Ballard Megan S., Sagers Jason D., Badiey Mohsen, Colosi John A., Pecknold Sean , Lin Ying-Tsong , Proshutinsky Andrey, Krishfield Richard, Worcester Peter F., Dzieciuch Matthew A., Turgut Altan
    Presenter: Ballard Megan
    Presentation type: oral
    Abstract: The Pacific Arctic Region, has experienced decadal changes in atmospheric conditions, seasonal sea-ice coverage, and thermohaline structure. From September 2016 to October 2017, the Canada Basin Acoustic Propagation Experiment (CANAPE) was conducted to observe the changing soundscape and to explore the use of acoustic remote sensing techniques in the transitioning Arctic. During the experiment, low-frequency signals from five tomographic sources located in the Canada Basin were recorded by an array of hydrophones with both horizontal and vertical apertures located on the Chukchi Shelf at the 150 m isobath. The propagation distances ranged from 240 km to 520 km, and the propagation conditions changed from persistently ducted in the basin to seasonally upward refracting on the continental shelf. An analysis of the received level from the tomography sources revealed a spatial dependence in the onset of the seasonal increase in transmission loss, which was correlated with the locations of the sources in the basin. This observation led to the hypothesis that the water advected from Barrow Canyon westward over the continental slope by the Chukchi slope current contributes to the temporal and spatial dependence observed in the acoustic record. The water column properties and ice draft were measured by oceanographic sensors on the basin tomography moorings and by six vertical arrays of oceanographic moorings on the continental shelf to characterize the temporal and spatial variability of the environment. This talk examines the range-dependent measurements and seeks to explain the observed variability in the received signals through propagation modeling. [Work sponsored by ONR.]\n
      Download the full paper
  • Corresponding author: Dr Ballard Megan
    Affiliation: Applied Research Laboratories,University of Texas
    Country: United States
    e-mail:

Back