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Filtering by: Creator Weissman, D. E. Remove constraint Creator: Weissman, D. E. Academic Affiliation College of Oceanic and Atmospheric Sciences Remove constraint Academic Affiliation: College of Oceanic and Atmospheric Sciences Has journal sim Journal of Physical Oceanography Remove constraint Has journal sim: Journal of Physical Oceanography

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  • A Modification of the Garrett–Munk Internal Wave Spectrum

    Creator:
    Levine, Murray D.
    Abstract:
    The Garrett–Munk (GM) spectrum continues to be a useful description of the oceanic internal wave field. However, there are several inconsistencies and ambiguities that make it difficult to use in comparing internal wave fields at different latitudes, stratifications, and water depths. A modified spectral formulation is presented that treats three...
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    . Murray D. Levine, 104 Ocean Admin. Bldg., Oregon State University, Corvallis, OR 97331. E-mail: levine

  • Energy Transmission by Barotropic Rossby Waves Revisited

    Creator:
    Matano, R. P. and Palma, E. D.
    Abstract:
    This article presents a semianalytic method to investigate the properties of energy transmission across bottom topography by barotropic Rossby waves. The method is first used to revisit the analytical estimates derived from wave-matching techniques and Wentzel–Kramers–Brillouin (WKB) approximations. The comparison between the semianalytic method and WKB indicates that the results...
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    . MATANO College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon E. D

  • Dissipative Losses in Nonlinear Internal Waves Propagating across the Continental Shelf

    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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    , University of Rhode Island, Kingston, Rhode Island E. L. SHROYER AND W. D. SMYTH College of Oceanic and

  • Estimating Open-Ocean Barotropic Tidal Dissipation: The Hawaiian Ridge

    Creator:
    Zaron, Edward D. and Egbert, Gary D.
    Abstract:
    The generalized inverse of a regional model is used to estimate barotropic tidal dissipation along the Hawaiian Ridge. The model, based on the linear shallow-water equations, incorporates parameterizations for the dissipation of energy via friction in the bottom boundary layer and form drag due to internal waves generated at topographic...
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    University, Corvallis, OR 97331. E-mail: ezaron@coas.oregonstate.edu JUNE 2006 Z A R O N A N D E G B E R T

  • Energy transport by nonlinear internal waves

    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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    University of Victoria, Victoria, British Columbia, Canada J. D. NASH, A. PERLIN, AND W. D. SMYTH College

  • Instability and Diapycnal Momentum Transport in a Double-Diffusive, Stratified Shear Layer

    Creator:
    Smyth, William D. and Kimura, Satoshi
    Abstract:
    The linear stability of a double-diffusively stratified, inflectional shear flow is investigated. Double-diffusive stratification has little effect on shear instability except when the density ratio R[subscript]ρ is close to unity. Double-diffusive instabilities have significant growth rates and can represent the fastest-growing mode even in the presence of inflectionally unstable shear...
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    , Corvallis, OR 97331-5503. E-mail: smyth@coas.oregonstate.edu JUNE 2007 S M Y T H A N D K I M U R A 1551

  • The Efficiency of Mixing in Turbulent Patches: Inferences from Direct Simulations and Microstructure Observations

    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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    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

  • Resonant Wind-Driven Mixing in the Ocean Boundary Layer

    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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    ., 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

  • Turbulence Decay and Restratification in the Equatorial Ocean Surface Layer following Nighttime Convection

    Creator:
    Caldwell, D. R., Lien, R-C., Moum, J. N., and Gregg, M. C.
    Abstract:
    Although the process of restratification of the ocean surface layer at the equator following nighttime convection is similar in many ways to the process at midlatitudes, there are important differences. A composite day calculated from 15 days of consistent conditions at 140°W on the equator was compared with midlatitude observations...
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    ; Terray et al. 1996; Dren- JUNE 1997 1121C A L D W E L L E T A L . nan et al. 1996). The number of

  • Narrowband Oscillations in the Upper Equatorial Ocean. Part II: Properties of Shear Instabilities

    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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    frequency, (d) phase velocity cp, (e) critical-level depth zc, and (f) wavelength l. 418 J O U R N A L O F