Toward ocean attenuation tomography: Determining acoustic volume attenuation coefficients in seawater using eigenray amplitudes

TitleToward ocean attenuation tomography: Determining acoustic volume attenuation coefficients in seawater using eigenray amplitudes
Publication TypeJournal Article
Year of Publication2016
AuthorsTippmann J.D, Sarkar J., Verlinden C.MA, Hodgkiss WS, Kuperman WA
JournalJournal of the Acoustical Society of America
Volume140
PaginationEL247-EL250
Date Published2016/09
Type of ArticleArticle
ISBN Number0001-4966
Accession NumberWOS:000386932500005
Keywordssound-absorption
Abstract

A deep-water experiment in the Pacific made in situ measurements of the volume attenuation coefficients of sea water in the mid-frequency range. The frequency, temperature, salinity, pH, and pressure dependent seawater attenuation coefficients were determined using a vertical line array that received and identified over 2000 unique paths from 1200 mid-frequency 3-9 kHz LFM source transmissions at a convergence zone range and depth up to 400 m. The results show no change in attenuation coefficients in this band compared to estimates from 30-year-old models previously determined from a combination of long-range ocean acoustic and laboratory experiments. The inversion also explores the feasibility of ocean acoustic attenuation tomography to further separate the depth-dependent chemical components responsible for the total attenuation loss through by isolating a group of deep-water refracting acoustic paths. (C) 2016 Acoustical Society of America

DOI10.1121/1.4962348
Student Publication: 
No
Research Topics: 
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