Abstract
Broadband acoustic signal intensity fluctuations, temporal correlations, and horizontal spatial correlations have been extracted from a horizontal array data set. The relationship between the acoustic signal variability and the fluid processes that perturb the sound-speed field will be discussed. The 2.048-s linear frequency-modulated signals were received on a 450-m horizontal array. The signals were centered at 300 and 500 Hz and had respective bandwidths of 60 and 90 Hz. The signal intensity was found to fluctuate by 10 to 20 dB as a function of time and space. Horizontal correlation length varied over time from 5 to 100 acoustic wavelengths and the signal correlation time ranged from 1 to 50 min. The data were acquired in May 2001 during the Asian Seas International Acoustics Experiment (AsiaEx). The 18-km acoustic propagation path lay along a 125-m isobath at the South China Sea shelf break. The experiment site was oceanographically dynamic, with energetic internal gravity wave fields and currents that strongly impacted the acoustic propagation. [Work supported by ONR.]
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