Volume Reverberation in the Fram Strait Marginal Ice Zone: May 1988

• Main Author: Wilson, Marcia A.
• Other Authors: NAVAL RESEARCH LAB STENNIS SPACE CENTER MS
• Format: Text
• Language: English
• Published: 1993
• Subjects: Snow; Ice and Permafrost; Acoustics; *ICE; *REVERBERATION; *SONAR; *MARGINAL ICE ZONES; FREQUENCY; FUNCTIONS; PULSES; CONFIGURATIONS; OCEANOGRAPHY; FRAM STRAIT; ICELAND; CHUKCHI SEA; GREENLAND; LABORATORIES; NAVAL RESEARCH LABORATORIES; TRANSDUCERS; OPERATION; SIGNALS; SCATTERING; DEPTH; PE62435N; WUDN496443; Arctic; Chukchi Sea; Greenland; Chukchi; Fram Strait; Ice; Iceland; permafrost; Spitsbergen
• Online Access: http://www.dtic.mil/docs/citations/ADA272983; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA272983

At frequencies between 3 and 50 kHz, high volume reverberation levels can have a limiting effect on active sonar operations. Therefore, experiments were conducted by the Naval Research Laboratory to determine the reverberation levels in the marginal ice zone. Three volume reverberation data sets were collected in May 1988 between Greenland and Spitsbergen in the Fram Strait. Data include frequencies from 3.5 to 50 kHz for downward-looking transducers and 3.5 to 12 kHz for an upward-looking configuration. Pulses of 10 and 40 ms in duration were used. Returning signals were processed to show depths and intensities of volume scattering. Layer strengths and column strengths are shown as a function of frequency. Column strengths are compared to those from the Chukchi Sea marginal ice zone and from locations near Greenland and Iceland. Acoustics, Arctic, Physical oceanography.