Overflow waters in the western Irminger Sea modify deep sound speed structure and convergence zone propagation

Details

• Journal Title:
  The Journal of the Acoustical Society of America
• Personal Author:
  Bhatt, EeShan C. ; Baggeroer, Arthur B. ; Weller, Robert A.
• NOAA Program & Office:
  NMFS (National Marine Fisheries Service) ; NEFSC (Northeast Fisheries Science Center)
• Description:
  Deep sound speed structure in the western Irminger Sea is found to be highly dynamic in comparison to the adiabatic (uniform) sound speed gradient underpinning data assimilation and modeling efforts around the globe. A beamed source parabolic equation model is used to illustrate how the resulting non-uniform sound speed structure at 1 to 1.5 km in depth and sound speed inversion near the seafloor produce observable effects on acoustic signals between a shallow source and shallow vertical line array at convergence zone ranges. Beamforming analysis shows that a uniform sound speed gradient leads to “ideal” interference patterns that do not capture or represent modeled convergence zone properties, such as location, strength, and sharpness. Overall findings suggest that in situ information about sound speed below 1 km is necessary for low frequency, long-range propagation studies, particularly in areas of complex thermohaline circulation.
• Source:
  The Journal of the Acoustical Society of America, 155(2), 1216-1229
• DOI:
  https://doi.org/10.1121/10.0024350
• ISSN:
  0001-4966
• Format:
  PDF
• Publisher:
  Acoustical Society of America (ASA)
• Document Type:
  Journal Article
• Rights Information:
  Other
• Compliance:
  Submitted
• Main Document Checksum:
  urn:sha-512:6b17a061428ed47f62f654af1bf489cd7891f5a4a546d67f49a5e27d9e89f58a2effedbd62cedcb43a63d00b1f81f032a5dbfffe4430d49cc94045696e748fba
• Download URL:
  https://repository.library.noaa.gov/view/noaa/66980/noaa_66980_DS1.pdf
• File Type:
  [PDF - 7.39 MB ]