Index Catalog // ScholarsArchive@OSU

Creator:: Moum, J. N., Farmer, D. M., Shroyer, E. L., Smyth, W. D., and Armi, L.
Abstract:: A single nonlinear internal wave tracked more than 100 wavelengths across Oregon’s continental shelf over a 12-h period exhibited nearly constant wave speed, c = 0.75 m s⁻¹, and amplitude, a = 15 m. The wavelength L gradually decreased from 220 m in 170-m water depth to 60 m in...
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Full Text:: , University of Rhode Island, Kingston, Rhode Island E. L. SHROYER AND W. D. SMYTH College of Oceanic and

Creator:: Smyth, W. D.
Abstract:: The linear theory of double diffusive interleaving is extended to take account of baroclinic effects. This study goes beyond previous studies by including the possibility of modes with nonzero tilt in the alongfront direction, which allows for advection by the baroclinic frontal flow. This requires that the stability equations be...
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Full Text:: . D. SMYTH College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon

Creator:: Moum, J. N., Klymak, J. M., Nash, J. D., Perlin, A., and Smyth, W. D.
Abstract:: Winter stratification on Oregon’s continental shelf often produces a near-bottom layer of dense fluid that acts as an internal waveguide upon which nonlinear internal waves propagate. Shipboard profiling and bottom lander observations capture disturbances that exhibit properties of internal solitary waves, bores, and gravity currents. Wavelike pulses are highly turbulent...
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Full Text:: University of Victoria, Victoria, British Columbia, Canada J. D. NASH, A. PERLIN, AND W. D. SMYTH College

Creator:: Smyth, W. D. and Kimura, S.
Abstract:: Mixing due to sheared salt fingers is studied by means of direct numerical simulations (DNS) of a double-diffusively unstable shear layer. The focus is on the “moderate shear” case, where shear is strong enough to produce Kelvin–Helmholtz (KH) instability but not strong enough to produce the subharmonic pairing instability. This...
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Full Text:: 1024 C 0.18 2.0 0.10 0.04 512 3 64 3 1024 D 0.18 1.6 0.10 0.04 512 3 64 3 1024 E 0.25 1.6 0.10 0.04 512

Creator:: Smyth, W. D., Moum, J. N., and Caldwell, D. R.
Abstract:: The time evolution of mixing in turbulent overturns is investigated using a combination of direct numerical simulations (DNS) and microstructure profiles obtained during two field experiments. The focus is on the flux coefficient Γ, the ratio of the turbulent buoyancy flux to the turbulent kinetic energy dissipation rate ϵ. In...
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Full Text:: kinetic energy evolves in accordance with d 1 u9u9 5 S 2 B 2 ^e & , (27)i i D7 8dt 2 D in which S 5 2

Creator:: Moum, J. N., Nash, J. D., and Smyth, W. D.
Abstract:: Extended measurements of temperature fluctuations that include the turbulence wavenumber band have now been made using rapidly sampled fast thermistors at multiple depths above the core of the Equatorial Undercurrent on the Tropical Atmosphere Ocean (TAO) mooring at 0°, 140°W. These measurements include the signature of narrowband oscillations as well...
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Full Text:: , (d) meridional velocity, and (e) squared shear. The xpod depths are denoted by the short horizontal

Creator:: Skyllingstad, Eric D., Smyth, W. D., Moum, J. N., and Wijesekera, H.
Abstract:: The response of the upper ocean to westerly wind forcing in the western equatorial Pacific was modeled by means of large-eddy simulation for the purpose of comparison with concurrent microstructure observations. The model was initialized using currents and hydrography measured during the Coupled Ocean–Atmosphere Response Experiment (COARE) and forced using...
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Full Text:: L L I N G S T A D E T A L . ]u]u ]wji^u0u0& 5 2K 1 , ^u0w& 5 2K ,i j m i h1 2]x ]x ]xj i i ]uP 2

Creator:: Skyllingstad, Eric D., Smyth, W. D., and Crawford, G. B.
Abstract:: The role of resonant wind forcing in the ocean boundary layer was examined using an ocean large-eddy simulation (LES) model. The model simulates turbulent flow in a box, measuring ~100–300 m on a side, whose top coincides with the ocean surface. Horizontal boundary conditions are periodic, and time-dependent wind forcing...
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Full Text:: ., Large et 1 AUGUST 2000 1867S K Y L L I N G S T A D E T A L . FIG. 1. Schematic showing main pathways

Creator:: Smyth, W. D., Moum, J. N., and Nash, J. D.
Abstract:: Narrowband oscillations observed in the upper equatorial Pacific are interpreted in terms of a random ensemble of shear instability events. Linear perturbation analysis is applied to hourly averaged profiles of velocity and density over a 54-day interval, yielding a total of 337 unstable modes. Composite profiles of mean states and...
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Full Text:: frequency, (d) phase velocity cp, (e) critical-level depth zc, and (f) wavelength l. 418 J O U R N A L O F

Creator:: Smyth, W. D., Nash, J. D., and Moum, J. N.
Abstract:: Direct numerical simulations are used to compare turbulent diffusivities of heat and salt during the growth and collapse of Kelvin–Helmholtz billows. The ratio of diffusivities is obtained as a function of buoyancy Reynolds number Re[subscript]b and of the density ratio R[subscript]ρ (the ratio of the contributions of heat and salt...
Resource Type:: Article
Full Text:: ) using (11), which under the Batchelor scaling becomes ��t� � � 0 2 �0 � f��e ��e�� 2t d��, �23

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