DIURNAL VARIATIONS IN UNDERWATER NOISE BENEATH SPRINGTIME SEA-ICE

Underwater ambient noise in ice-covered seas can show a dependence on air temperature. This temperature dependence is particularly striking in spring in the latitudes of the Canadian Arctic Archipelago where the air temperatures are, in turn, dependent on the altitude of the Sun. The upper curve sho...

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Bibliographic Details
Main Authors: Milne,A. R., Ganton,J. H.
Other Authors: DEFENCE RESEARCH ESTABLISHMENT PACIFIC VICTORIA (BRITISH COLUMBIA)
Format: Text
Language:English
Published: 1969
Subjects:
Snow
Ice and Permafrost
Acoustics
(*SEA ICE
ARCTIC REGIONS)
(*UNDERWATER SOUND
DIURNAL VARIATIONS)
ATMOSPHERIC TEMPERATURE
CRACKS
TENSILE PROPERTIES
STRESSES
CONTRACTION
PRESSURE
CANADA
AMBIENT NOISE
Arctic
Canada
Canadian Arctic Archipelago
Arctic Archipelago
Ice
permafrost
Sea ice
Online Access:http://www.dtic.mil/docs/citations/AD0694296
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0694296
Description
Summary:Underwater ambient noise in ice-covered seas can show a dependence on air temperature. This temperature dependence is particularly striking in spring in the latitudes of the Canadian Arctic Archipelago where the air temperatures are, in turn, dependent on the altitude of the Sun. The upper curve shows the air temperature plotted against time of day during the period April 16 to April 27. The lower bar-graph is an underwater noise pressure record in the 150-300 Hz band on the same time scale. The envelope of the bar-graph shows diurnal variations similar to the expected diurnal temperature variations of air temperature, but shifted in phase by approximately 180 degrees. (Author)

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