FRAM II Single Channel Ambient Noise Statistics: A Paper Presented at the 101st Meeting of the Acoustical Society of America, 19 May 1981, Ottawa, Canada.

• Main Author: Dwyer,Roger F
• Other Authors: NAVAL UNDERWATER SYSTEMS CENTER NEW LONDON CT NEW LONDON LAB
• Format: Text
• Language: English
• Published: 1981
• Subjects: Snow; Ice and Permafrost; Acoustics; *AMBIENT NOISE; *UNDERWATER ACOUSTICS; *PACK ICE; FREQUENCY; TENSILE STRESS; STATISTICAL ANALYSIS; IMPULSE NOISE; FRICTION; SPECTRUM ANALYSIS; TIME DOMAIN; ACOUSTIC DATA; COLLISIONS; DEEP OCEANS; ARCTIC OCEAN; UNDERICE; Non-Gaussian noise; Shorefast ice; Ice dynamics; LPN-NUSC-A-750- 30; PE61152N; Arctic; Arctic Ocean; Canada; Ice; permafrost
• Online Access: http://www.dtic.mil/docs/citations/ADA108755; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA108755

This document describes the results of a statistical analysis study of FRAM II arctic under-ice ambient noise data. The specific data that were analyzed were recorded on 23-24 April 1980 from a pack ice camp in the Arctic Ocean, located at 86 deg N latitude, 25 deg W longitude. At this location, the bottom depth was approximately 4000 m. The measurement system consisted of a broadband omnidirectional hydrophone, suspended to a depth of 91 m from a sonobuoy located in a lead. Under the influence of arctic currents, the pack ice was slowly moving. This movement caused rifting and cracking of ice, which occurred, at times, throughout the experiments and represented a structured acoustic noise source. Both impulsive and burst noise were identified in the data and were probably created by tensile cracks and rubbing ice masses.