ASA 129th Meeting - Washington, DC - 1995 May 30 .. Jun 06

1aAO2. A comparison of measured and predicted broadband acoustic arrival patterns out to 10-Mm range during the ATOC Acoustic Engineering Test.

Bruce M. Howe

Brian D. Dushaw

James A. Mercer

Robert I. Odom

Robert C. Spindel

Appl. Phys. Lab., Univ. of Washington, Seattle, WA 98105

Peter F. Worcester

John Colosi

Bruce D. Cornuelle

Matthew Dzieciuch

Scripps Inst. of Oceanog., Univ. of California at San Diego, La Jolla, CA 92093

Arthur B. Baggeroer

MIT, Cambridge, MA 02139

Ted Birdsall

Kurt Metzger

Univ. of Michigan, Ann Arbor, MI 48109

Gary Bold

Sze Tan

Chris Tindle

Univ. of Auckland, Auckland, New Zealand

Michael Guthrie

Defense Scientific Establishment, Auckland, New Zealand

A low-frequency acoustic source suspended from R/P FLIP approximately 340 nautical miles WSW of San Diego transmitted to receivers 90 to 10 000 km distant during the Acoustic Engineering Test of the Acoustic Thermometry of Ocean Climate (ATOC) Program. The source was suspended for 7 days during November 1994 near the depth of the sound channel axis (about 650 m) in water over 4000 m deep, in order to avoid near-source bottom interactions. The source transmitted a phase-coded m-sequence with a center frequency of 75 Hz and a digit length of 27 ms [Metzger et al., this meeting]. Measured receptions on five bottom-mounted SOSUS receivers at ranges from 300--4000 km, on two vertical line array receivers at ranges of 90 and 3300 km, and on a sonobuoy modified to have the hydrophone on the sound channel axis at about 10 000-km range, are compared with ray theoretic, adiabatic normal mode, and broadband parabolic equation predictions. [Work supported by the Strategic Environmental Research and Development Program through ARPA.]