2019_programme: CHARACTERIZING THE HIGH-FREQUENCY ACOUSTIC RESPONSE FROM SEA ICE OVER ONE SEASON OF NATURAL ENVIRONMENTAL FORCING IN THE CHUKCHI SEA

• Session: 09. Acoustics in polar environments
  Organiser(s): Tegowski Jaroslaw
• Lecture: CHARACTERIZING THE HIGH-FREQUENCY ACOUSTIC RESPONSE FROM SEA ICE OVER ONE SEASON OF NATURAL ENVIRONMENTAL FORCING IN THE CHUKCHI SEA
  Paper ID: 907
  Author(s): Lyons Anthony, Lyons Anthony, Levine Robert, Chris Bassett
  Presenter: Lyons Anthony
  Presentation type: oral
  Abstract: Understanding recent and rapid changes in Arctic sea ice calls for extensive and continuous observations of the ice cover. In-situ stations are spatially limited and satellite remote sensing techniques miss key variables of internal sea-ice structure. Utilizing a new fisheries dataset formed with 38, 70 and 200kHz upward-looking transducers in the northeast Chukchi Sea, we take a first look at how the interfacial and internal scattering changes in response to environmental forcing. A complete annual cycle of narrow band scattering returns from the winter of 2017-2018 are investigated with comparisons to the overlying sea-ice cover. The initial effort in this research is constrained to the stable growth phase of sea ice in winter through the early melt onset the following spring. Individual, minimally-deformed ice floes are identified and tracked when located over the deployment sites. Additionally, atmospheric conditions relevant to changes in the internal properties of sea ice are cross-compared to scattering returns. Results from this preliminary analysis will guide pending Arctic fieldwork and the future development of inverse methods for acoustic remote sensing of sea ice.
• Corresponding author: Mr Deemer Gregory
  Affiliation: University of New Hampshire
  Country: United States
  e-mail: