Dear MARMAM, On behalf of my co-authors, I would like to announce the publication of our article:
DeAngelis, A. I., Valtierra, R., Van Parijs, S. M., & Cholewiak, D. 2017. Using multipath reflections to obtain dive depths of beaked whales from a towed hydrophone array. The Journal of the Acoustical Society of America 142(2): 1078-1087 doi:10.1121/1.4998709. Abstract Beaked whales are deep divers, emitting echolocation clicks while at depth. Little is known about the dive behavior of most species; however, passive acoustic data collected with towed hydrophone arrays can provide depth information using multipath reflections of clicks coupled with a two-dimensional localization of the individual. Data were collected during a shipboard survey in the western North Atlantic Ocean using a towed linear hydrophone array. Beaked whale tracks were classified as either Cuvier’s (Ziphius cavirostris) or Gervais’/True’s (Mesoplodon europaeus/Mesoplodon mirus). Weighted species average depths and weighted species standard deviations were 1158 m *+* 287 m for Cuvier’s (n= 24), and 870 m *+* 151 m for Gervais’/True’s (n= 15). Depth uncertainties ranged from 3% to 142% of the average depth. Slant ranges were corrected for depth to provide average horizontal perpendicular distance estimates. The average horizontal perpendicular distance distribution exhibited fewer detections in the first bin than the second. This is the first report of dive depths for Gervais’/True’s beaked whales and use of this method to obtain depths for beaked whales using a towed linear array. For the full article, please visit the publisher's website http://asa.scitation.org/doi/full/10.1121/1.4998709. To request a PDF copy, please email annamaria.i...@noaa.gov. Cheers, Annamaria Annamaria Izzi DeAngelis *Research Analyst* Passive Acoustics Research Group | Northeast Fisheries Science Center 166 Water Street, Woods Hole, MA 02543
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