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Filtering by: Creator Gidley, D. W. Remove constraint Creator: Gidley, D. W. Has journal sim Journal of Physical Oceanography Remove constraint Has journal sim: Journal of Physical Oceanography

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  • Heat and Energy Balances in the Upper Ocean at 50°N, 140°W during November 1980 (STREX)

    Creator:
    Paduan, S. D. and DeSzoeke, R. A.
    Abstract:
    Subsurface temperature data and surface meteorological data are analyzed from thermistor chain moorings deployed near 50°N, 140°W during the Storm Transfer and Response Experiment (STREX). The upper-ocean heat and potential energy (PE) contents to 90 m are examined for an 18-day period and their changes compared to the sources and...
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    Article

  • Instabilities of a Baroclinic, Double Diffusive Frontal Zone

    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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    Article
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    tempera- Corresponding author address: W. D. Smyth, College of Oce- anic and Atmospheric Sciences, Oregon

  • Mixing in a Moderately Sheared Salt-Fingering Layer

    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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    Layer W. D. SMYTH AND S. KIMURA College of Oceanic and Atmospheric Sciences, Oregon State University

  • Surface Wave Effects on High-Frequency Currents over a Shelf Edge Bank

    Creator:
    Wijesekera, H. W., Wang, D. W., Teague, W. J., Jarosz, E., Rogers, W. E., Fribance, D. B., and Moum, J. N.
    Abstract:
    Several acoustic Doppler current profilers and vertical strings of temperature, conductivity, and pressure sensors, deployed on and around the East Flower Garden Bank (EFGB), were used to examine surface wave effects on high-frequency flows over the bank and to quantify spatial and temporal characteristic of these high-frequency flows. The EFGB,...
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    Article
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    Currents over a Shelf Edge Bank H. W. WIJESEKERA, D. W. WANG, W. J. TEAGUE, E. JAROSZ, AND W. E. ROGERS

  • Baroclinic Interleaving Instability: A Second-Moment Closure Approach

    Creator:
    Smyth, W. D., Burchard, H., and Umlauf, L.
    Abstract:
    Interleaving motions on a wide, baroclinic front are modeled using a second-moment closure to represent unresolved fluxes by turbulence and salt fingering. A linear perturbation analysis reveals two broad classes of unstable modes. First are scale-selective modes comparable with interleaving as observed in oceanic fronts. These correspond well with observations...
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    -Moment Closure Approach W. D. SMYTH, H. BURCHARD, AND L. UMLAUF Leibniz Institute for Baltic Sea

  • Large-Eddy Simulation of Flow over Two-Dimensional Obstacles: High Drag States and Mixing

    Creator:
    Skyllingstad, Eric D. and Wijesekera, Hemantha W.
    Abstract:
    A three-dimensional large-eddy simulation (LES) model was used to examine how stratified flow interacts with bottom obstacles in the coastal ocean. Bottom terrain representing a 2D ridge was modeled using a finite-volume approach with ridge height (4.5 m) and width (~30 m) and water depth (~45 m) appropriate for coastal...
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    Article
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    -Dimensional Obstacles: High Drag States and Mixing ERIC D. SKYLLINGSTAD AND HEMANTHA W. WIJESEKERA College

  • Turbulence and Mixing in Holmboe Waves

    Creator:
    Smyth, W. D. and Winters, K. B.
    Abstract:
    Motivated by the tendency of high-Prandtl-number fluids to form sharp density interfaces, the authors investigate the evolution of Holmboe waves in a stratified shear flow through direct numerical simulation. Like their better-known cousins, Kelvin–Helmholtz waves, Holmboe waves lead the flow to a turbulent state in which rapid irreversible mixing takes...
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    Waves W. D. SMYTH College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis

  • Statistical Characteristics of the Large-Scale Response of Coastal Sea Level to Atmospheric Forcing

    Creator:
    Allen, J. S. and Denbo, D. W.
    Abstract:
    As part of a study of the large-scale response of coastal sea level to atmospheric forcing along the west coast of North America during June–September 1973, Halliwell and Allen calculate space- and time-lagged cross-correlation coefficients Rτζ between adjusted sea level ζ at fixed alongshore locations ζ(y0) and the alongshore component...
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    Article

  • Rotary Empirical Orthogonal Function Analysis of Currents near the Oregon Coast

    Creator:
    Denbo, D. W. and Allen, J. S.
    Abstract:
    Empirical orthogonal function (EOF) analysis in the frequency domain is extended to complex time series. EOFs are calculated from the eigenvectors of the band-averaged rotary cross-spectral matrix. This gives EOF amplitude and phase for negative and positive frequencies, corresponding to clockwise and anticlockwise rotation for the hodograph model. Rotary EOF...
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    Article

  • Mean Flow Generation on a Continental Margin by Periodic Wind Forcing

    Creator:
    Denbo, D. W. and Allen, J. S.
    Abstract:
    The generation of an alongshore mean flow by the nonlinear interaction of forced barotropic shelf waves over a continental margin is studied using a wind-forced, ƒ-plane model with bottom friction in an attempt to develop a model for poleward eastern boundary undercurrents. It is assumed that the Rossby number is...
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