Index Catalog // ScholarsArchive@OSU

Geostrophic Circulation in a Rectangular Basin with a Circumpolar Connection

Creator:: Samelson, R. M.
Abstract:: A simple theory is presented for steady geostrophic circulation of a stratified fluid in a rectangular basin with a circumpolar connection. The interior flow obeys the β-plane Sverdrup vorticity balance, and the circulation is closed by geostrophic boundary currents. The circulation is forced by surface thermal gradients and wind-driven Ekman...
Resource Type:: Article
Full Text:: geostrophic boundary currents. The circulation is forced by surface thermal gradients and wind- driven Ekman

Turbulence in a Sheared, Salt-Fingering-Favorable Environment: Anisotropy and Effective Diffusivities

Creator:: Kimura, Satoshi, Smyth, William, and Kunze, Eric
Abstract:: Direct numerical simulations (DNS) of a shear layer with salt-fingering-favorable stratification have been performed for different Richardson numbers Ri and density ratios R[subscript]p. In the absence of shear (Ri = oo), the primary instability is square planform salt fingering, alternating cells of rising and sinking fluid. In the presence of...
Resource Type:: Article
Full Text:: Oceanic and Atmospheric Sciences, Oregon State University, Corvallis, Oregon ERIC KUNZE Applied Physics

Microstructure estimates of turbulent salinity flux and the dissipation spectrum of salinity

Creator:: Nash, Jonathan D. and Moum, James N.
Abstract:: Direct determination of the irreversible turbulent flux of salinity in the ocean has not been possible because of the complexity of measuring salinity on the smallest scales over which it mixes. Presented is an analysis of turbulent salinity microstructure from measurements using a combined fast-conductivity/temperature probe on a slowly falling...
Resource Type:: Article
Full Text:: ), and to the turbulent heat flux. It is found that the ratio of haline to thermal turbulent

The Dissipation of Fluctuating Tracer Variances

Creator:: de Szoeke, Roland A.
Abstract:: The evolution of the covariance of two tracers involves a quantity called codissipation, proportional to the covariance of the gradients of the two tracers, and analogous to the dissipation of tracer variance. The evolution of the variance of a composite tracer—a linear combination of two simple, primary tracers—depends on the“composite...
Resource Type:: Article
Full Text:: tracer constructed from temperature and salinity, is proportional at equilibrium to thermal dissipation

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

Narrowband Oscillations in the Upper Equatorial Ocean. Part I: Interpretation as Shear Instabilities

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...
Resource Type:: Article
Full Text:: stratified shear flows. Linear sta- bility analysis applied to measured velocity and density profiles leads

Global Patterns of Diapycnal Mixing from Measurements of the Turbulent Dissipation Rate

Creator:: Waterhouse, Amy F., MacKinnon, Jennifer A., Nash, Jonathan D., Alford, Matthew H., Kunze, Eric, Simmons, Harper L., Polzin, Kurt L., St. Laurent, Louis C., Sun, Oliver M., Pinkel, Robert, Talley, Lynne D., Whalen, Caitlin B., Huussen, Tycho N., Carter, Glenn S., Fer, Ilker, Waterman, Stephanie, Naveira Garabato, Alberto C., Sanford, Thomas B., and Lee, Craig M.
Abstract:: The authors present inferences of diapycnal diffusivity from a compilation of over 5200 microstructure profiles. As microstructure observations are sparse, these are supplemented with indirect measurements of mixing obtained from (i) Thorpe-scale overturns from moored profilers, a finescale parameterization applied to (ii) shipboard observations of upper-ocean shear, (iii) strain as...
Resource Type:: Article
Full Text:: Sciences, Oregon State University, Corvallis, Oregon #Applied Physics Laboratory and School of

Seasonal Cross-Shelf Flow Structure, Upwelling Relaxation, and the Alongshelf Pressure Gradient in the Northern California Current System

Creator:: McCabe, Ryan M., Hickey, Barbara M., Dever, Edward P., and MacCready, Parker
Abstract:: Moored observations are used to investigate the seasonal change in vertical structure of the cross-shelf circulation at a midshelf location in the northern California Current System. A streamwise–normal coordinate system is employed to eliminate meander- and eddy-induced biases in the cross-shelf flow that are unaccounted for with an alternative, commonly...
Resource Type:: Article
Full Text:: -shelf flow that are un- accounted for with an alternative, commonly applied approach. The resulting

Estuarine Exchange Flow Quantified with Isohaline Coordinates: Contrasting Long and Short Estuaries

Creator:: Chen, Shih-Nan, Geyer, W. Rockwell, Ralston, David K., and Lerczak, James A.
Abstract:: Isohaline coordinate analysis is used to compare the exchange flow in two contrasting estuaries, the long (with respect to tidal excursion) Hudson River and the short Merrimack River, using validated numerical models. The isohaline analysis averages fluxes in salinity space rather than in physical space, yielding the isohaline exchange flow...
Resource Type:: Article
Full Text:: , National Taiwan University, Taipei, Taiwan, and Applied Ocean Physics & Engineering, Woods Hole

Diurnal Shear Instability, the Descent of the Surface Shear Layer, and the Deep Cycle of Equatorial Turbulence

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

ScholarsArchive@OSU

Geostrophic Circulation in a Rectangular Basin with a Circumpolar Connection

Turbulence in a Sheared, Salt-Fingering-Favorable Environment: Anisotropy and Effective Diffusivities

Microstructure estimates of turbulent salinity flux and the dissipation spectrum of salinity

The Dissipation of Fluctuating Tracer Variances

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

Narrowband Oscillations in the Upper Equatorial Ocean. Part I: Interpretation as Shear Instabilities

Global Patterns of Diapycnal Mixing from Measurements of the Turbulent Dissipation Rate

Seasonal Cross-Shelf Flow Structure, Upwelling Relaxation, and the Alongshelf Pressure Gradient in the Northern California Current System

Estuarine Exchange Flow Quantified with Isohaline Coordinates: Contrasting Long and Short Estuaries

Diurnal Shear Instability, the Descent of the Surface Shear Layer, and the Deep Cycle of Equatorial Turbulence

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