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Cruise Info
| Cruise ID | RR0914 |
| Vessel | R/V ROGER REVELLE |
| Title | ALBATROSS Expedition (ALBT) |
| Abstract | Deep Sound is a high-bandwidth acoustic recording, free-falling system designed to profile ambient noise from the surface to depths of 9 km. The recording platform is autonomous and descends under gravity at 1 m/s to its pre-programmed maximum depth, where a burn-wire releases a weight, permitting the system to return to the surface under its own buoyancy. Two hydrophones are mounted at half meter vertical spacing allowing the noise spectrum and vertical coherence (directionality) to be obtained over four decades of frequency (10 Hz - 100 kHz). The acoustic recordings are made continuously as the instrument descends and ascends along with measurements of sound speed and depth. The system low power and large data storage capability allows round trips to the deepest trenches of the ocean. Alternative modes of operation include the systems ability to act as a synthetic aperture, or to descend to the seabed, record and return to the surface at a later time. A Deep Sound Mark II is currently under development, which uses four hydrophones for measuring the vertical and horizontal properties of the ambient noise field. The next stage of this research is to deploy the instrument in the field and record data in a deep ocean trench. From this data set, the primary goals of the experiment will be accomplished, to measure spatial coherence (directionality), intensity, attenuation and absorption over a large range of depths and a large bandwidth. Secondary goals of this research are the measurement of environmental parameters through ambient noise and exploiting the free falling nature of Deep Sound to perform synthetic aperture processing. The Deep-ocean Assessment and Reporting of Tsunamis (DART) recovery will also happen on this cruise leg. DART is a NOAA National Data Buoy Center (NDBC) project. |
| Description | Transit Cruise |
| Proposal Title | Deep Sound |
| Starting Port | Apra, Mariana Islands, Guam |
| Ending Port | Nukualofa, Tonga |
| Starting Date | 2009-11-06 |
| Ending Date | 2009-11-19 |
| Principal Investigator | Barclay, David R. |