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Filtering by: Contributor Samelson, Roger, M. Remove constraint Contributor: Samelson, Roger, M. Academic Affiliation College of Oceanic and Atmospheric Sciences Remove constraint Academic Affiliation: College of Oceanic and Atmospheric Sciences

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  • Quantifying linear disturbance growth in periodic and aperiodic systems

    Creator:
    Wolfe, Christopher Lee
    Abstract:
    The mathematical and physical connections between three different ways of quantifying linear predictability in geophysical fluid systems are studied in a series of analytical and numerical models. Normal modes, as they are traditionally formulated in the instabilities theories of geophysical fluid dynamics, characterize the asymptotic development of disturbances to stationary...
    Resource Type:
    Dissertation
    Full Text:
    Disturbance Growth in Periodic and Aperiodic Systems Abstract approved: Roger M. Samelson The mathematical

  • 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:
    Approaches to the Physics of Mesoscale Oceanography Abstract approved: Roger M. Samelson The long-term

  • Field validation of a nearshore circulation model for alongshore-nonuniform flows

    Creator:
    Wilson, Gregory W.
    Abstract:
    We investigate, theoretically and experimentally, the problem of modeling depth-integrated (2DH) surf zone circulation on an alongshore-nonuniform natural beach, with waves approaching from an arbitrary angle. An approximate theoretical model is developed, which captures the important effect of advection in the alongshore dynamics, and shows that a nondimensional parameter Re[subscript]s...
    Resource Type:
    Masters Thesis
    Full Text:
    0.25 0.5 0.75 v 1 ,a m p/ (g h b )1 /2 κ H b /sγ Fig. 2.1: Perturbed flow amplitude v1,amp from

  • The cross-equatorial structure of tropical instability waves in sea surface height

    Creator:
    Lyman, John M.
    Abstract:
    A linearized model with two vertical modes has been developed to understand observed characteristics of monthly variability in the Equatorial Pacific from TOPEX/POSEIDON measurements of Sea Surface Height (SSH). The 2-mode model is obtained from an equatorial beta plane model that has been linearized about a geostrophically balanced mean flow...
    Resource Type:
    Dissertation
    Full Text:
    Instability Waves in Sea Surface Height by John M. Lyman A DISSERTATION submitted to Oregon State

  • Long baroclinic planetary waves in a nonzonal vertically sheared mean flow

    Creator:
    Cerovecki, Ivana
    Abstract:
    We consider long planetary waves of annual period linearized about a steady, wind-driven subtropical (ST) gyre circulation. The circulation divides the gyre into an eastern zone (EZ) where only the surface layer is in steady motion and a western zone (WZ) where both the surface and the middle layer are...
    Resource Type:
    Dissertation
    Full Text:
    Roger Samelson to be on my committee before I had met him. I could not have made a better choice

  • A modeling study of katabatic flows

    Creator:
    Smith, Craig M.
    Abstract:
    A modeling study is undertaken to better understand the physics of katabatic flows. This study is divided into three topics; a comparison between a large eddy simulation (LES) and a mesoscale model of katabatic flows, a sensitivity study of katabatic flows to various physical parameters, and an investigation into the...
    Resource Type:
    Masters Thesis
    Full Text:
    pleasure to work with him. I would also like to thank the members of my committee, Dr. Roger Samelson, Dr

  • 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:
    to analytical models that Corresponding author address: Dr. Roger M. Samelson, College of Oceanic

  • Surface wind modification near mid-latitude ocean fronts : observational and dynamical analysis

    Creator:
    O'Neill, Larry W.
    Abstract:
    Interactions between surface winds and meanders in mid-latitude sea surface temperature (SST) fronts with horizontal length scales of 100-1000 km are investigated from satellite observations and numerical simulations. Observations from the Sea- Winds scatterometer on the QuikSCAT satellite show that the magnitude, direction, curl, and divergence of the surface wind...
    Resource Type:
    Dissertation
    Full Text:
    , Eric Maloney, and Roger Samelson for their enthusiastic guidance and help. To my wonderful close

  • Numerical Simulation of Air–Sea Coupling during Coastal Upwelling

    Creator:
    Perlin, Natalie, Skyllingstad, Eric D., Samelson, Roger M., and Barbour, Philip L.
    Abstract:
    Air–sea coupling during coastal upwelling was examined through idealized three-dimensional numerical simulations with a coupled atmosphere–ocean mesoscale model. Geometry, topography, and initial and boundary conditions were chosen to be representative of summertime coastal conditions off the Oregon coast. Over the 72-h simulations, sea surface temperatures were reduced several degrees near...
    Resource Type:
    Article
    Full Text:
    University, Corvallis, Oregon ROGER M. SAMELSON College of Oceanic and Atmospheric Sciences, and

  • Evidence for atmospheric control of sea-ice motion through Nares Strait

    Creator:
    Samelson, Roger M., Agnew, T., Melling, H., and Munchow, A.
    Abstract:
    Satellite observations of ice motion are combined with model estimates of low‐level winds and surface wind stress to provide evidence for atmospheric control of sea‐ice motion through Nares Strait, between Ellesmere Island and Greenland, during two periods in 2004. The results suggest that ice flux through the strait, and its...
    Resource Type:
    Article
    Full Text:
    through Nares Strait R. M. Samelson,1 T. Agnew,2 H. Melling,3 and A. Münchow4 Received 24 October 2005