Collection and Preliminary Analysis of Under-Ice Ambient Noise Data, Cape North, January to April, 1971.

• Main Author: Oake,Austen Martin
• Other Authors: NAVAL POSTGRADUATE SCHOOL MONTEREY CALIF
• Format: Text
• Language: English
• Published: 1971
• Subjects: Snow; Ice and Permafrost; Acoustics; *UNDERWATER SOUND; SEA ICE; NOVA SCOTIA; NOISE; MEASUREMENT; WEATHER; WAVE EQUATIONS; HYDROPHONES; DATA PROCESSING EQUIPMENT; THESES; Cape North; Ice; ice pack; permafrost; Sea ice
• Online Access: http://www.dtic.mil/docs/citations/AD0733177; http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0733177

Ambient noise data was collected from bottom-mounted hydrophones in 65 fms of water near Cape North, Nova Scotia, from January to April 1971. Preliminary analyses indicate that generalizations made from data collected at other sites can be used in only the broadest sense to predict noise levels at Cape North. The open water spectral shapes resemble deep water spectral shapes proposed by Wenz (1962) rather than shallow water spectra found by Piggott (1964) at another location on the Scotian Shelf. Under-ice noise levels are below open water levels in the frequency range 40 Hz to 2 kHz, but above this frequency, mechanical noise sources within the ice pack elevate levels above those found under open water conditions.