Basin-scale tidal measurements using acoustic tomography
Basin-scale tidal measurements using acoustic tomography
Date
1990-09
Authors
Headrick, Robert H.
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Date Created
Location
Pacific Ocean
DOI
10.1575/1912/5419
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Keywords
Tomography
Underwater acoustics
Underwater acoustics
Abstract
Travel-times of acoustic signals were measured between a bottom-mounted source near
Oahu and four bottom-mounted receivers located near Washington, Oregon, and California
in 1988 and 1989. This paper discusses the observed tidal signals. At three out
of four receivers, observed travel times at M2 and S2 periods agree with predictions
from barotropic tide models to within ±30° in phase and a factor of 1.6 in amplitude.
The discrepancy at the fourth receiver can be removed by including predicted effects of
phase-locked baroclinic tides generated by seamounts.
Our estimates of barotropic M2 tidal dissipation by seamounts vary between 2 x 1016
and 1 X 1018 erg·s-1. The variation by two orders of magnitude is due to uncertainties in
the numbers and sizes of seamounts. The larger dissipation (1 x 1018 erg·s-1) is the same
order as previous estimates and amounts to 4% of the total dissipation at M2.
Description
Submitted in partial fulfillment of the requirements for the degree of Master of Science at the Massachusetts Institute of Technology and the Woods Hole Oceanographic Institution September 1990
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Citation
Headrick, R. H. (1990). Basin-scale tidal measurements using acoustic tomography [Master's thesis, Massachusetts Institute of Technology and Woods Hole Oceanographic Institution]. Woods Hole Open Access Server. https://doi.org/10.1575/1912/5419