The Transarctic Acoustic Propagation Experiment and climate monitoring in the Arctic

摘要: In April 1994, coherent acoustic transmissions were propagated across the entire Arctic basin for first time. This experiment, known as Transarctic Acoustic Propagation Experiment (TAP), was designed to determine feasibility of using these signals monitor changes in Ocean temperature and sea ice thickness concentration. CW maximal length sequences (MLS) transmitted from source camp located north Svalbard Archipelago 1000 km a vertical line array Lincoln Sea 2600 two-dimensional horizontal Beaufort Sea. TAP demonstrated that 19.6-Hz 195-dB (251-W) with both sufficiently low loss high phase stability support pulse compression processing MLS detection signals. These yield time delay measurements an order magnitude better than what is required detect estimated 80-ms/year travel caused by interannual longer term temperature. The data provided propagation compare models be used correlating modal scattering losses properties monitoring. times measured indicated warming Atlantic layer close 0.4/spl deg/C, which has been confirmed direct measurement icebreakers submarines, demonstrating utility thermometry Arctic. unique advantages importance climate monitoring are discussed. A four-year program, Climate Observations Underwater Sound underway carry out installations sources receivers Ocean.