| Summary: | Progress Code: completed Statement: This dataset only contains acoustic events that were detected and analysed during the voyage. During periods when few sounds were present, all of the sounds were likely to be included in the acoustic event log. During periods when many sounds were detected, not all sounds could be included in the acoustic event log due to the limited amount of time and attention available for processing files. Purpose Passive acoustics involves the use of underwater listening devices to detect and locate calling animals. Antarctic blue whales frequently make extremely loud, repeated calls that can be heard over a greater range than they can be seen by a visual observer on a ship. The main purpose of passive acoustics on this voyage was to: - detect and locate calling blue whales - provide baseline information about Antarctic blue whale vocalisations After calibration of the sonobuoy, the acoustician on-duty monitored and analysed incoming vocalisations to obtain bearings from the sonobuoy to all detected whale vocalisations. - Bearings from multiple sonobuoys were used to triangulate the location of the whales (Latitude, Longitude WGS84). - Acousticians noted all whale calls in a Acoustic Event Log, including any additional information that may be useful for tracking and 'targeting' (eg., sightings of whales, sonobuoys or other vessels, acoustic, electrical, or radio noise, gear failure, etc). The acoustic tracking software stored all acquired bearings, and cross bearings in text files. During the 2013 Antarctic Blue Whale Voyage Acousticians noted all whale calls and other acoustic events that were detected during real-time monitoring in a Sonobuoy Event Log. The acoustic tracking software, difarBSM, stored processed bearings from acoustic events and cross bearings in tab delimited text files. Each event was assigned a classification by the acoustician, and events for each classification were stored in separate text files. The first row in each file contains the column headers, and the ...
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