Constraints on ocean internal wave spectra from long‐range acoustic transmission data

1998 ◽  
Vol 103 (5) ◽  
pp. 2789-2789
Author(s):  
John Viechnicki ◽  
Michael G. Brown
Keyword(s):  
Internal Wave ◽  
Long Range ◽  
Wave Spectra ◽  
Acoustic Transmission ◽  
Transmission Data

Influence of mean sound speed on acoustic transmission through an internal wave

1976 ◽  
Vol 59 (3) ◽  
pp. 536-544
Author(s):  
G. A. Lieberman ◽  
M. J. Jacobson ◽  
W. L. Siegmann
Keyword(s):  
Internal Wave ◽  
Sound Speed ◽  
Acoustic Transmission

Typical features of internal wave spectra

1969 ◽  
Vol 5 ◽  
pp. 95-101 ◽  
Author(s):  
W. Krauss
Keyword(s):  
Internal Wave ◽  
Wave Spectra

scholarly journals A long‐range acoustic experiment with sampling in the internal wave fluctuation band

1988 ◽  
Vol 84 (S1) ◽  
pp. S91-S91
Author(s):  
Timothy F. Duda ◽  
Stanley M. Flatté ◽  
Harry A. DeFerrari ◽  
Hien B. Nguyen
Keyword(s):  
Internal Wave ◽  
Long Range

Internal wave effects on long‐range ocean acoustic tomography

1995 ◽  
Vol 97 (5) ◽  
pp. 3235-3235
Author(s):  
M. A. Wolfson ◽  
J. L. Spiesberger ◽  
F. D. Tappert
Keyword(s):  
Internal Wave ◽  
Long Range ◽  
Acoustic Tomography ◽  
Wave Effects ◽  
Ocean Acoustic Tomography

A comparison of high frequency acoustic transmission data from a smooth water/sand interface with a composite poroelastic model

2002 ◽  
Vol 112 (5) ◽  
pp. 2254-2254
Author(s):  
Marcia Isakson ◽  
Daniel Weigl ◽  
Erik Bigelow ◽  
Nicholas Chotiros
Keyword(s):  
High Frequency ◽  
Acoustic Transmission ◽  
Transmission Data ◽  
Poroelastic Model

scholarly journals Eikonal Calculations for Energy Transfer in the Deep-Ocean Internal Wave Field near Mixing Hotspots

2017 ◽  
Vol 47 (1) ◽  
pp. 199-210 ◽  
Author(s):  
Takashi Ijichi ◽  
Toshiyuki Hibiya
Keyword(s):  
Energy Transfer ◽  
Internal Wave ◽  
Wave Field ◽  
Vertical Velocity ◽  
Deep Ocean ◽  
Wave Spectra ◽  
Scale Separation ◽  
Transfer Rates ◽  
Calculated Energy ◽  
Internal Wave Field

AbstractIn the proximity of mixing hotspots in the deep ocean, the observed internal wave spectra are usually distorted from the Garrett–Munk (GM) spectrum and are characterized by the high energy level E as well as a shear–strain ratio Rω quite different from that of the GM spectrum. On the basis of the eikonal theoretical model, Ijichi and Hibiya (IH) recently proposed the revised finescale parameterization of turbulent dissipation rates in the distorted internal wave field, although the vertical velocity associated with background internal waves and the strict WKB scale separation, for example, were not taken into account. To see the effects of such simplifying assumptions on the revised parameterization, this study carries out a series of eikonal calculations for energy transfer through various internal wave spectra distorted from the GM. Although the background vertical velocity and the strict WKB scale separation somewhat affect the calculated energy transfer rates, their parameter dependence is confirmed as expected; the calculated energy transfer rates ε follow the basic scaling ε ∝ E2N2f with the local buoyancy frequency N and the local inertial frequency f and exhibit strong Rω dependence quite similar to that predicted by IH.

Oceanic Isopycnal Slope Spectra. Part I: Internal Waves

2007 ◽  
Vol 37 (5) ◽  
pp. 1215-1231 ◽  
Author(s):  
Jody M. Klymak ◽  
James N. Moum
Keyword(s):  
Internal Wave ◽  
Internal Waves ◽  
Vertical Profile ◽  
Dissipation Rate ◽  
Wave Spectra ◽  
The Poor ◽  
Order Of Magnitude

Abstract Horizontal tow measurements of internal waves are rare and have been largely supplanted in recent decades by vertical profile measurements. Here, estimates of isotherm displacements and turbulence dissipation rate from a towed vehicle deployed near Hawaii are presented. The displacement data are interpreted in terms of horizontal wavenumber spectra of isopycnal slope. The spectra span scales from 5 km to 0.1 m, encompassing both internal waves and turbulence. The turbulence subrange is identified using a standard turbulence fit, and the rest of the motions are deemed to be internal waves. The remaining subrange has a slightly red slope (ϕ ∼ k−1/2x) and vertical coherences compatible with internal waves, in agreement with previous towed measurements. However, spectral amplitudes in the internal wave subrange exhibit surprisingly little variation despite a four-order-of-magnitude change in turbulence dissipation rate observed at the site. The shape and amplitude of the horizontal spectra are shown to be consistent with observations and models of vertical internal wave spectra that consist of two subranges: a “linear” subrange (ϕ ∼ k0z) and a red “saturated” subrange (ϕ ∼ k−1z). These two subranges are blurred in the transformation to horizontal spectra, yielding slopes close to those observed. The saturated subrange does not admit amplitude variations in the spectra yet is an important component of the measured horizontal spectra, explaining the poor correspondence with the dissipation rate.

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