Index Catalog // ScholarsArchive@OSU

Creator:: Wijesekera, H. W., Jarosz, E., Teague, W. J., Wang, D. W., Fribance, D. B., Moum, J. N., and Warner, S. J.
Abstract:: Pressure differences across topography generate a form drag that opposes the flow in the water column, and viscous and pressure forces acting on roughness elements of the topographic surface generate a frictional drag on the bottom. Form drag and bottom roughness lengths were estimated over the East Flower Garden Bank...
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Full Text:: with a sampling rate of 1Hz. Spectra were averaged into 210 frequency bins. (b) Enlarged plot showing

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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Full Text:: -preserving frequency spectra: (a) u, (b) y, and (c) verticalw velocity components computed at 5.5-, 11.5

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:: of P and K3d (Figs. 3a,b). In contrast, the initial growth rate of the KP mode was a strong func

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:: 29J O U R N A L O F P H Y S I C A L O C E A N O G R A P H Y FIG. 1. (a) Surface wind stress, (b

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...
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Full Text:: of 0.11Nm22, its root-mean-square value. The net FIG. 1. (a) Absolute wind stress, (b) net surface

Creator:: Moum, J. N. and Nash, J. D.
Abstract:: Recent turbulence measurements over a small bank on the continental shelf off Oregon reveal a previously undetected site for intense mixing of the coastal ocean. The flow is hydraulically controlled and turbulence diffusivities over the bank are more than 100 times greater than estimates made on the shelf away from...
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Full Text:: stress over the bank, # t b dA ; 4 3 106 N (dA 5 2000 3 10 000 m2). 2052 VOLUME 30J O U R N A L O F P

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:: as the sum of a background den- sity profile, o � b(z), and a perturbation associated with the wave

Creator:: Moum, J. N., Perlin, A., Klymak, J. M., Levine, M. D., Boyd, Timothy John, 1958-2013, and Kosro, P. M.
Abstract:: Closely spaced vertical profiles through the bottom boundary layer over a sloping continental shelf during relaxation from coastal upwelling reveal structure that is consistent with convectively driven mixing. Parcels of fluid were observed adjacent to the bottom that were warm (by several millikelvin) relative to fluid immediately above. On average,...
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Full Text:: . A profile of the offshoreHJ b component of the velocity in the Ekman layer is denoted uEkman. The

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:: been described in detail previously (Smyth 1999; Smyth and Moum 2000a,b); here, we pro- vide a brief

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...
Resource Type:: Article
Full Text:: the upper 150 m: (a) zonal velocity, (b) squared shear, (c) squared buoyancy frequency, and (d

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