Departmental Papers (EES)
Document Type
Journal Article
Date of this Version
December 2003
Abstract
A blind comparison with data is made with a model for the coherence time of broadband sound (133 Hz, 17-Hz bandwidth) at 3709 km. Coherence time is limited by changes in the ocean because the acoustic instruments are fixed to the Earth on the bottom of the sea with time bases maintained by atomic clocks. Although the modeled coherence time depends a bit on the difficult problem of correctly modeling relative signal-to-noise ratios, normalized correlation coefficients of the broadband signals for the data (model) are 0.90 (0.83), 0.72 (0.59), and 0.51 (0.36) at lags of 2, 4.1, and 6.2 min, respectively. In all these cases, observed coherence times are a bit longer than modeled. The temporal evolution of the model is based on the linear dispersion relation for internal waves. Acoustic propagation is modeled with the parabolic approximation and the sound-speed insensitive operator.
Date Posted: 27 July 2005
This document has been peer reviewed.
Comments
Copyright ASA. Reprinted from Journal of the Acoustical Society of America, Volume 114, Issue 6, December 2003, pages 3147-3154 .
Publisher URL: http://dx.doi.org/10.1121/1.1629305