Accession Number : ADA267868


Title :   Real Time System for Practical Acoustic Monitoring of Global Ocean Temperature


Descriptive Note : Quarterly progress rept. no. 1


Corporate Author : WOODS HOLE OCEANOGRAPHIC INSTITUTION MA


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a267868.pdf


Report Date : 15 Jul 1993


Pagination or Media Count : 32


Abstract : Work completed includes the algorithms which calculate the loss for geometric and diffracted rays. An algorithm was written which does not generate extraneous eigenrays. Work on the calculation of acoustic travel times using ocean models is also on schedule. Multi-year runs of the wind driven equatorial Pacific model have been completed, allowing for the extraction of the Kelvin wave signal. Remote-forced NE Pacific (NEP) model runs have been completed for 1961-1991. Two main features appear in these calculations. (1) When realistic bottom topography is included, cyclonic eddies form on the American coast, and slowly propagate westward. (2) Kelvin waves from El Nino events produce Rossby waves with amplitude much larger than in non-El Nino years and therefore should significantly effect acoustic travel times. Algorithms for calculating the travel time from acoustic source to receiver have been developed for great circle paths. All elements of the SSAR development are well underway. The array design (spacing and number of hydrophones) is complete, as is the optimum depth determination.


Descriptors :   *TEMPERATURE , *OCEANOGRAPHIC DATA , *ACOUSTIC DATA , COMPUTER PROGRAMS , OCEAN CURRENTS , WIND , AIR WATER INTERACTIONS , ACOUSTIC VELOCITY , OCEAN TIDES , SEAMOUNTS , TRAVEL TIME , OCEAN BOTTOM TOPOGRAPHY , RAY TRACING , DEPTH , REPORTS , ACOUSTIC WAVES , ALGORITHMS


Subject Categories : Physical and Dynamic Oceanography
      Acoustic Detection and Detectors


Distribution Statement : APPROVED FOR PUBLIC RELEASE