Long Range Acoustic Transmission Loss in the Marginal Ice Zone North of Iceland

Long range acoustic transmission loss measurements were made in the marginal ice zone north of Iceland in the late winter time period. The measurements were obtained with the use of two aircraft, one flying prearranged tracks dropping standard U.S. Navy explosive sound signals at timed intervals, th...

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Bibliographic Details
Main Authors: Bradley,David L., Colvin,Gabriel M.
Other Authors: NAVAL ORDNANCE LAB WHITE OAK MD
Format: Text
Language:English
Published: 1973
Subjects:
Physical and Dynamic Oceanography
Snow
Ice and Permafrost
(*SEA ICE
*SOUND TRANSMISSION)
UNDERWATER SOUND
REFRACTION
ATTENUATION
GREENLAND SEA
Arctic
Greenland
Greenland Sea
Ice
Iceland
permafrost
Sea ice
Online Access:http://www.dtic.mil/docs/citations/AD0763662
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0763662
Description
Summary:Long range acoustic transmission loss measurements were made in the marginal ice zone north of Iceland in the late winter time period. The measurements were obtained with the use of two aircraft, one flying prearranged tracks dropping standard U.S. Navy explosive sound signals at timed intervals, the second aircraft loitering in a fixed area to monitor modified, calibrated sonobuoys, which were deployed to receive the incoming shot arrivals. Two distinct transmission loss tracks were flown and subsequently analyzed, one an ice-free track, the second ice-covered. Transmission loss data is presented for selected octave bands together with some abbreviated comparisons with data obtained in the deep arctic basins. The general conclusion to be drawn from this measurement program is that for similar refractive conditions, the acoustic transmission loss is higher over an ice-covered path then it is over an open water path for the frequency range of 63 Hz to 2000 Hz. (Author)

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