Index Catalog // ScholarsArchive@OSU

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:: terms of LO/ LT is found. Applied to observational data, this parameterization leads to a 50%–60

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:: stratified shear flows. Linear sta- bility analysis applied to measured velocity and density profiles leads

Creator:: Smyth, W. D., Moum, J. N., Li, L., and Thorpe, S. A.
Abstract:: A new theory of shear instability in a turbulent environment is applied to eight days of velocity and density profiles from the upper-equatorial Pacific. This period featured a regular diurnal cycle of surface forcing, together with a clear response in upper-ocean mixing. During the day, a layer of stable stratification...
Resource Type:: Article
Full Text:: environment is applied to eight days of velocity and density profiles from the upper-equatorial Pacific. This

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:: -dependent wind forcing is applied at the surface. Two wind forcing scenarios were studied: one with resonant

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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Full Text:: gradient was in thermal wind balance with an alongfront current. Once again they found the potential for

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...
Resource Type:: Article
Full Text:: buoyancy b is just the sum of the thermal and saline buoyancies: b � bT � bS . �4� In (2) the subscript i

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...
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Full Text:: experiments, this time using thermal and sa- line stratification simultaneously. Like Turner, they found

Creator:: Smyth, W. D., Zavialov, P. O., and Moum, J. N.
Abstract:: Measurements of velocity, hydrography, surface meteorology, and microstructure were made through several squall events during a westerly wind burst that occurred in the Western Pacific warm pool in December 1992. Sustained wind forcing generated a weakly stratified turbulent surface layer that extended to the top of the main thermocline. Following...
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Full Text:: . Alternatively, one may estimate the temperature variance of the patch and the thermal dissipation rate, x, and

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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Full Text:: , Oregon K. B. WINTERS Applied Physics Laboratory, University of Washington, Seattle, Washington

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:: have recently been applied to help under- stand ocean boundary layer processes (Siegel and Do- maradzki

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