Abstract
The Acoustic Thermometry of Ocean Climate, Alternate Source Test, and North Pacific Acoustic Laboratory experiments generated extensive vertical array data sets for studying normal-mode signals at megameter ranges. These data sets include receptions for 28-, 75-, and 84-Hz sources at ranges of 3.5 and 5 Mm. Recent analysis of the low-mode arrivals in these receptions produced estimates of important mode statistics, including the modal time spread, cross-mode coherence, and temporal coherence. This talk will present the experimental results and place them in context, making comparisons to theoretical predictions about long-range mode propagation and to numerical simulations. The implications for future research will be discussed. [Work sponsored by an ONR Ocean Acoustics Entry-Level Faculty Award.]
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