Deep ocean sound speed characteristics passively derived from the ambient acoustic noise field

摘要: The propagation of acoustic waves in the ocean strongly depends on temperature. Lowfrequency can penetrate down to depths where few situ measurements are available. It is therefore attractive obtain a measure deep temperature from waves. latter especially true if ambient noise field be used instead deterministic transient signals. In this study velocity, and hence temperature, derived an interferometric approach hydrophone array recordings. arrays were separated by over 125 km, near Ascension Island Atlantic Ocean, at depth 850 m. Furthermore, dispersive characteristics sound channel resolved based retrieved lag times for different modes. addition, it shown how resolution increased cross correlating beams rather than recordings single-sensor pairs. observed between corresponds well modelled values, full-wave modelling through best-known oceanic models.