Spatial Variability of the Ambient Noise Field Associated with the Marginal Ice Zone and Its Relationship to Environmental Parameters

During July 1987 an acoustical experiment was conducted by the United States Naval Research Laboratory in the East Greenland Sea Marginal Ice Zone (MIZ). Ambient noise 'hot spots' or concentrated areas of relatively high noise levels were found along the ice edge using a towed array. Ambie...

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Bibliographic Details
Main Author: Biggs, Kristian P.
Other Authors: NAVAL POSTGRADUATE SCHOOL MONTEREY CA
Format: Text
Language:English
Published: 1988
Subjects:
Snow
Ice and Permafrost
Acoustic Detection and Detectors
Acoustics
*SEA ICE
*AMBIENT NOISE
*UNDERWATER ACOUSTICS
WEATHER
PARAMETERS
TOWED ARRAYS
EDGES
THESES
EDDIES(FLUID MECHANICS)
RADAR IMAGES
METEOROLOGICAL DATA
VARIATIONS
CORRELATION
LEVEL(QUANTITY)
WIND VELOCITY
HOT SPOTS
SEA STATES
SEA LEVEL
ACOUSTIC FIELDS
BATHYTHERMOGRAPH DATA
MICROWAVE FREQUENCY
SONOBUOYS
PHOTOGRAPHS
GREENLAND SEA
EAST(DIRECTION)
BUOYS
HIGH RATE
SATELLITE PHOTOGRAPHY
SPATIAL DISTRIBUTION
TEMPERATURE
MARGINAL ICE ZONES
AN/SSQ-57
MICROWAVE IMAGES
Greenland
East Greenland
Greenland Sea
Ice
permafrost
Sea ice
Online Access:http://www.dtic.mil/docs/citations/ADA203923
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA203923
Description
Summary:During July 1987 an acoustical experiment was conducted by the United States Naval Research Laboratory in the East Greenland Sea Marginal Ice Zone (MIZ). Ambient noise 'hot spots' or concentrated areas of relatively high noise levels were found along the ice edge using a towed array. Ambient noise levels were obtained on 27 and 28 July using AN/SSQ-57A and AN/SSQ-57XN5 calibrated sonobuoys. The temperature structure of the area was determined using XBT (ship) and AXBT (P3C aircraft) buoys placed inside and outside the ice edge. The ice edge was determined from coincident satellite photos, 90 GHz microwave imagery and P3 radar ice edge maps. Weather data (sea state and wind speed and direction) were recorded on the ship. The data seem to indicate a correlation between the high ambient noise levels of the hot spots and the presence of large topographically controlled mesoscale eddy located at the southeastern extent of the MIZ. Keywords: Greenland Sea; Marginal ice zones; Underwater acoustics; Bathythermograph data; Sonobuoys; Radar images; Sea ice; Eddies fluid mechanics; Theses.

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