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  • Turbulence in sheared, salt-fingering favorable environment

    Creator:
    Kimura, Satoshi
    Abstract:
    Instability and turbulence in sheared, salt-fingering favorable stratification are studied using three-dimensional direct numerical simulations (DNS). Salt-fingering favorable stratification is gravitationally stable, because the unstable vertical gradient of salinity is stabilized by temperature (warm, salty over cool, fresh water-masses). Salt-fingering instability can occur at the interface of these different water-masses....
    Resource Type:
    Dissertation
    Full Text:
    : Turbulence in Sheared, Salt-fingering Favorable Environment Abstract approved: William D. Smyth

  • Turbulence and biophysical fluxes in the near surface ocean

    Creator:
    Hoecker-Martínez, Martín
    Abstract:
    Vertical transports of plankton, momentum, heat, and turbulence are modeled. A novel integration of high resolution turbulence and biophysical modeling is used to show the influence of a Kelvin-Helmholtz instability on the vertical migration of simple gyrotactic organisms. A viscous limit on mixing driven by shear turbulence is proposed. Large...
    Resource Type:
    Dissertation
    Full Text:
    biophysical fluxes in the near surface ocean. Abstract Approved: William D. Smyth Vertical transports of

  • Mathematical approaches to the physics of mesoscale oceanography

    Creator:
    Early, Jeffrey J.
    Abstract:
    The long-term evolution of Gaussian eddies is studied in an equivalent barotropic model using both linear and nonlinear quasi-geostrophic theory in an attempt to understand westward propagating satellite altimetry tracked mesoscale eddies. By examining both individual eddies and a large basin seeded with eddies, it is shown that long term...
    Resource Type:
    Dissertation
    Full Text:
    1 AN ABSTRACT OF THE DISSERTATION OF Jeffrey J. Early for the

  • Destabilization of a Stratified Shear Layer by Ambient Turbulence

    Creator:
    Li, Lin
    Abstract:
    A small eddy viscosity or mass diffusivity that varies with height has been found to have unexpected effects on the Kelvin-Helmholtz (KH) instability of a stably stratified shear layer near the neutral stability boundary. In particular, varying viscosity can increase the growth rate of the instability in contrast to the...
    Resource Type:
    Masters Thesis
    Full Text:
    : ______________________________________________________ William D. Smyth ABSTRACT A small eddy viscosity or mass diffusivity that varies with

  • Shear and convective turbulence in a model of thermohaline intrusions

    Creator:
    Mueller, Rachael
    Abstract:
    Thermohaline interleaving is an important mechanism for laterally fluxing salt, heat, and nutrients between oceanic water masses. Interleaving is driven by a release of potential energy resulting from the vastly differing diffusivities of heat and salt in seawater. The flows are composed of stacked intrusions that flux more buoyant and...
    Resource Type:
    Masters Thesis
    Full Text:
    Turbulence in a Model of Thermohaline Intrusions Abstract approved: William D. Smyth Thermohaline

  • Evaluating desiccated cyanobacteria Aphanizomenon flos-aquae for use as a biofertilizer on Swiss Chard

    Creator:
    Turk, Douglas E.
    Abstract:
    Non-toxic species of desiccated blue-green algae, or cyanobacteria, may offer potential for use as a fertilizer on irrigated crops. Here, the non-toxic cyanobacteria species Aphanizomenon flos-aquae (AFA), collected from Upper Klamath Lake, Oregon, was evaluated for use as a biofertilizer in a controlled experiment on Swiss chard “Bright Lights” (Beta...
    Resource Type:
    Research Paper
    Full Text:
    Milligan and Dr. Johanna (Caity) Smyth for their guidance and patience throughout the course of this

  • Secondary Kelvin-Helmholtz instability in weakly stratified shear flow

    Creator:
    Smyth, William D.
    Abstract:
    The growth of secondary vortices on the braids separating Kelvin–Helmholtz billows is investigated via numerical simulations. The similarity theory of Corcos & Sherman (1976) is extended to include mixing processes with Prandtl number greater than unity, and is shown to provide a useful description of the physics of the braid...
    Resource Type:
    Article
    Full Text:
    weakly stratified shear flow By WILLIAM D. SMYTH College of Oceanic and Atmospheric Sciences, Oregon

  • Linear theory of roll instabilities in the ocean surface layer

    Creator:
    Duncombe, Jenessa R.
    Abstract:
    This thesis describes the results of a linear stability analysis conducted on a simulated wind-forced ocean front. The ocean surface boundary layer regulates exchanges between the ocean and atmosphere, and the presence of turbulence in the surface layer can greatly impact climate and ocean life. Past research has shown that...
    Resource Type:
    Masters Thesis
    Full Text:
    : _____________________________________________________________________ Roger M. Samelson Eric D. Skyllingstad ABSTRACT This thesis describes the results

  • Nonlinear internal waves on the continental shelf

    Creator:
    Shroyer, Emily L.
    Abstract:
    The properties and evolution of nonlinear internal waves (NLIWs) depend upon the background conditions within which waves form, propagate, and dissipate. As a result, the NLIW field on the New Jersey shelf displayed dramatic variability during the Shallow Water 2006 experiment. Wave variability was exhibited by 1) amplitudes that ranged...
    Resource Type:
    Dissertation
    Full Text:
    Smyth, and William Hetherington. I feel very fortunate to have worked with such ex- ceptional

  • Candidate Genes Associated with Blister Rust Resistance in Whitebark Pine (Pinus albicaulis) Revealed through de novo Transcriptome Assembly and Differential Gene Expression Analysis

    Creator:
    Bair, Zolton J.
    Abstract:
    Whitebark pine (Pinus albicaulis) is an iconic North American high-elevation tree species currently threatened by climate change, mountain pine beetle, and white pine blister rust (WPBR), a lethal disease caused by the non-native fungal pathogen Cronartium ribicola. In collaboration with the USDA Forest Service Dorena Genetic Resource Center, germplasm was...
    Resource Type:
    Dissertation
    Full Text:
    : ____________________________________________________ Jeffrey K. Stone Whitebark pine (Pinus albicaulis) is an iconic North American high