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Philippine Sea deep water acoustic observations : A new test for acoustic wave propagation through random media models

A primary goal of the Philippine Sea (2010–2011) experiment was to test the ability of models to predict stochastic acoustic fluctuations. The experiment had six different sources transmitting broadband pulses (200 Hz–300 Hz) to a water column spanning vertical line array. The transmission ranges varied from 130 km to 450 km, and took place across a 250 km x 250 km area. The observations are a new opportunity for two reasons. First, the source frequencies are twice that of the previous experiments that used less than 100 Hz. Second, the oceanography is more dynamic than previous sites in the North Pacific with energetic mesoscale and internal tide variability. This talk uses acoustic mode observations to analyze both broadband and narrowband statistics. Narrowband comparisons focus on mode energy estimates at different frequencies, and these results are compared with the Colosi-Morozov model. Broadband observations focus on mode pulse temporal spreads and these results are compared to predictions from a h...