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Hydro-acoustic signals generated by drifting icebergs that crack, disintegrate and collide were identified on two hydrophone arrays in the Indian Ocean. These hydrophone arrays are deployed in the SOund Fixing And Ranging (SOFAR) channel, enabling the detection of small sources over ranges of several thousand kilometers due to the low attenuation. Source locations estimated from the signal bearings at the arrays are used to monitor two very large icebergs, C20 and B17B. Spatial and temporal correlation of the location estimates with satellite observations confirm that the icebergs can be hydro-acoustically resolved. Hydro-acoustic generation rates at both C20 and B17B are highest at times of observed break-up. For C20, which underwent continuous break-up, clusters of events to the south-east of the main iceberg show that hydro-acoustic observations can identify trails of icebergs that calved from the main berg whose dimensions are less than that easily resolved by moderate resolution satellite monitoring.

Item Type:	Refereed Article
Keywords:	hydro-acoustic waves, CTBT, IMS, icebergs
Research Division:	Earth Sciences
Research Group:	Oceanography
Research Field:	Physical oceanography
Objective Division:	Environmental Management
Objective Group:	Marine systems and management
Objective Field:	Measurement and assessment of marine water quality and condition
UTAS Author:	Young, NW (Mr Neal Young)
ID Code:	86342
Year Published:	2013
Web of Science® Times Cited:	14
Deposited By:	CRC-Antarctic Climate & Ecosystems
Deposited On:	2013-09-06
Last Modified:	2017-11-30
Downloads:	154 View Download Statistics