Index Catalog // ScholarsArchive@OSU

Creator:: Smyth, William D. and Moum, James N.
Abstract:: Kelvin-Helmholtz (KH) instability, characterized by the distinctive finite-amplitude billows it generates, is an important mechanism in the development of turbulence in the stratified interior of the ocean. In particular, it is often assumed that the onset of turbulence in internal waves begins in this way. Clear recognition of the importance...
Resource Type:: Article
Full Text:: a N D J a M e S N . M O u M S p e c I a l I S S u e O N I N t e r N a l WaV e S aBStr ac t

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:: Turbulent Salinity Flux and the Dissipation Spectrum of Salinity JONATHAN D. NASH* AND JAMES N. MOUM

Creator:: Smyth, William D. and Moum, James N.
Abstract:: Turbulence resulting from Kelvin–Helmholtz instability in layers of localized stratification and shear is studied by means of direct numerical simulation. Our objective is to present a comprehensive description of the turbulence evolution in terms of simple, conceptual pictures of shear–buoyancy interaction that have been developed previously based on assumptions of...
Resource Type:: Article
Full Text:: 2000 Length scales of turbulence in stably stratified mixing layers William D. Smytha) and James N

Creator:: Nash, Jonathan D. and Moum, James N.
Abstract:: Observations of currents, hydrography, and turbulence provide unambiguous evidence for hydraulic control of flow over an isolated three-dimensional topographic feature on Oregon’s continental shelf. The flow becomes critical at the crest of the bank, forming a strong supercritical downslope flow in the lower layer. Farther downstream, internal hydraulic jumps form...
Resource Type:: Article
Full Text:: Jonathan D. Nash • and James N. Moum College of Oceanic and Atmospheric Sciences, Oregon State University

Creator:: Nash, Jonathan D. and Moum, James N.
Abstract:: At the smallest length scales, conductivity measurements include a contribution from salinity fluctuations in the inertial–convective and viscous–diffusive ranges of the turbulent scalar variance spectrum. Interpreting these measurements is complicated because conductivity is a compound quantity of both temperature and salinity. Accurate estimates of the dissipation rate of salinity variance...
Resource Type:: Article
Full Text:: atot_16_312.263_274 FEBRUARY 1999 263N A S H A N D M O U M q

Creator:: Zaron, Edward D. and Moum, James N.
Abstract:: A reexamination of turbulence dissipation measurements from the equatorial Pacific shows that the turbulence diffusivities are not a simple function of the gradient Richardson number. A widely used mixing scheme, the K-profile parameterization, overpredicts the turbulent vertical heat flux by roughly a factor of 4 in the stably stratified region...
Resource Type:: Article
Full Text:: surface boundary layer and low-gradient regions are excluded. OCTOBER 2009 Z A R O N A N D M O U M 2655

Creator:: Smyth, William D. and Moum, James N.
Abstract:: Direct numerical simulations of turbulence resulting from Kelvin–Helmholtz instability in stably stratified shear flow are used to study sources of anisotropy in various spectral ranges. The set of simulations includes various values of the initial Richardson and Reynolds numbers, as well as Prandtl numbers ranging from 1 to 7. We...
Resource Type:: Article
Full Text:: 2000 Anisotropy of turbulence in stably stratified mixing layers William D. Smytha) and James N. Moum

Creator:: Smyth, William D., Hebert, D., and Moum, James N.
Abstract:: A westerly wind burst observed in the warm pool of the western equatorial Pacific Ocean cooled the ocean's surface layer by about 0.8°C. Turbulent entrainment at the base of this layer caused cooling but also heating due to the reversal of the vertical temperature gradient during rain events. Consequently, the...
Resource Type:: Article
Full Text:: responses W. D. Smyth College of Oceanic and Atmospheric Sciences, Oregon State University, Corvallis D

Creator:: Smyth, William D., Hebert, D., and Moum, James N.
Abstract:: The dynamic response to a westerly wind burst which occurred during the Couple Ocean Atmosphere Response Experiment in the warm pool of the equatorial Pacific Ocean is described using velocity, hydrography, and microstructure measurements. Turbulent fluxes distributed momentum input from the wind over a near-surface layer of variable thickness. Coriolis...
Resource Type:: Article
Full Text:: ), Brunt-Vi/is•l• frequency N • (d•shcd curves), (d) Richardson number Ri (d•shcd curves), •nd dissipation

Creator:: Kilcher, Levi F., Nash, Jonathan D., and Moum, James N.
Abstract:: Turbulence controls the composition of river plumes through mixing and alters the plume's trajectory by diffusing its momentum. While believed to play a crucial role in decelerating river-source waters, the turbulence stress in a near-field river plume has not previously been observationally quantified. In this study, finely resolved density, velocity,...
Resource Type:: Article
Full Text:: Jonathan D. Nash,1 and James N. Moum1 Received 24 June 2011; revised 27 March 2012; accepted 2 April 2012

ScholarsArchive@OSU