Synonyms
Acoustic thermometry; Acoustic Thermometry of Ocean Climate (ATOC); Moving ship tomography; Ocean acoustic tomography (OAT); Reciprocal tomography
Definition
Ocean acoustic tomography is a remote sensing technique that employs the transmission of sound over large distances within the ocean to precisely estimate averages of temperature and current. Acoustic tomography data usually consist of time-of-flight travel times of acoustic pulses, which represent natural integrating measures of sound speed and current along acoustic paths. Variations in sound speed are predominantly caused by variations in temperature.
Introduction
Acoustic tomography is a technique for measuring large-scale ocean temperature and current using acoustic signals propagating over 100–1,000 km distances. The technique relies on the nature of the oceanic sound speed profile, which acts as an acoustic waveguide, and the transparency of the ocean to low-frequency sound. Sound speed is a function of...
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Links
Acoustic Technology for Observing the interior of the Arctic Ocean (ACOBAR): http://acobar.nersc.no
The Heard Island Feasibility Test (HIFT): http://909ers.apl.washington.edu/~dushaw/heard/
North Pacific Acoustic Laboratory (NPAL): http://npal.ucsd.edu/
Ocean Acoustics Library: http://oalib.hlsresearch.com/
Discovery of Sound in the Sea (DOSITS) http://www.dosits.org/
Ocean acoustic tomography on Wikipedia: http://en.wikipedia.org/wiki/Ocean_acoustic_tomography
A day in the life of a tomography mooring: http://staff.washington.edu/dushaw/mooring/
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Dushaw, B. (2014). Acoustic Tomography, Ocean. In: Njoku, E.G. (eds) Encyclopedia of Remote Sensing. Encyclopedia of Earth Sciences Series. Springer, New York, NY. https://doi.org/10.1007/978-0-387-36699-9_211
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