Long range transmission loss of broadband seismic pulses in the Arctic under ice-free conditions.
In 2008 the Louis S. St-Laurent (LSSL) surveyed deep Arctic waters using a three-airgun seismic source. Signals from the seismic survey were detected between 400 km and 1300 km range on a directional autonomous acoustic recorder deployed in water 53 m deep off the Alaskan North Slope. Observations of received signal levels between 10-450 Hz versus LSSL range roughly fit a cylindrical transmission loss model plus 0.01 dB/km attenuation in deep ice-free waters, and fit previous empirical models in ice-covered waters. The transition between ice-free and ice-covered propagation conditions shifted 200 km closer to the recorder during the survey.
Aaron
A
Thode
Katherine H
KH
Kim
Charles R
CR
Greene
Ethan
E
Roth
D000162:Acoustics; D001110:Arctic Regions; D005844:Geology; D008962:Models, Theoretical; D009038:Motion; D009792:Oceans and Seas; D011312:Pressure; D011825:Radar; D012767:Ships; D012815:Signal Processing, Computer-Assisted; D013016:Sound; D013018:Sound Spectrography