Abstract
The purpose of this field expedition was to determine if acoustic techniques could be used to assist in conducting a census of the bowhead population during its eastward spring migration past Point Barrow, Alaska. A three-hydrophone triangular array was established at the edge of the shore past ice off Point Barrow, Alaska in May 1982. The two base legs of the array were 988 and 1486 m in length with a vertex angle of 172.8°. The longest leg was oriented 44.7 °T and the short leg 231.9 °T. Over 7500 bowhead whale sounds were recorded during the period 3–17 May 1982. Localizations based on arrival time differences were developed from 145 sounds recorded during a 2-day period of high sound activity, 8–9 May. These localizations revealed some whales to be beyond an observer's maximum visual range. A 2-min film clip showing field contributions and whale sightings will be presented. [Work supported by North Slope Borough, Alaska.]
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