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Recent results of the ACOUS (Arctic Climate Observation using Underwater Sound) Program

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The first stationary transarctic path for year-round acoustic observations of temperature changes in the Arctic Ocean was established in October 1998 as part of the U.S./Russian ACOUS project. The path was created with an autonomous acoustic source deployed 200 km north-west of Franz Josef Land and an autonomous vertical receiving array in the Lincoln Sea 1250 km away. The source was operating until December 1999. The obtained acoustic thermometry time series consists of 107 20-minute tomographic signals transmitted at a 4-day interval. Acoustic mode filtering of the received signals was performed and temporal variations of the modal amplitudes, travel times and phase were analyzed. The analysis of experimental data revealed several acoustic phenomena such as strong long-term variations of the modal amplitudes and pulse shapes and considerable decrease of the travel time of mode 1 starting from August 1999. Numerical modeling showed that the amplitude variations of modes were due to mode coupling and substantial change in the travel time of mode 1 was a result of unexpectedly large crosswise extent of the warm Atlantic water circulation core north of the Eurasia continental slope. It is also demonstrated that consideration of the mode coupling effects in the modal arrival patterns gives a way for locating changes in the ocean environment along the acoustic path.
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Document Type: Research Article

Publication date: 01 September 2002

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  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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