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Filtering by: Creator Suryan, R. M. Remove constraint Creator: Suryan, R. M. Academic Affiliation College of Oceanic and Atmospheric Sciences Remove constraint Academic Affiliation: College of Oceanic and Atmospheric Sciences

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  • Simple Mechanistic Models of Middepth Meridional Overturning

    Creator:
    Samelson, R. M.
    Abstract:
    Two idealized, three-dimensional, analytical models of middepth meridional overturning in a basin with a Southern Hemisphere circumpolar connection are described. In the first, the overturning circulation can be understood as a “pump and valve” system, in which the wind forcing at the latitudes of the circumpolar connection is the pump...
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    Middepth Meridional Overturning R. M. SAMELSON College of Oceanic and Atmospheric Sciences, Oregon State

  • 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...
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    Rectangular Basin with a Circumpolar Connection R. M. SAMELSON College of Oceanic and Atmospheric Sciences

  • A Simple Dynamical Model of the Warm-Water Branch of the Middepth Meridional Overturning Cell

    Creator:
    Samelson, R. M.
    Abstract:
    A reduced-gravity model is presented of the warm-water branch of the middepth meridional overturning circulation in a rectangular basin with a circumpolar connection. The model describes the balance between production of warm water by Ekman advection across the circumpolar current, dissipation of warm water by eddy fluxes southward across the...
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    Branch of the Middepth Meridional Overturning Cell R. M. SAMELSON College of Oceanic and Atmospheric

  • The Vertical Structure of Linear Coastal-Trapped Disturbances

    Creator:
    Samelson, R. M.
    Abstract:
    The vertical structure of coastal-trapped disturbances in several idealized models of a stably stratified lower atmosphere is examined. The vertical structure and phase speeds of the trapped modes depend on the resting stratification and the height of the orographic step. The presence of a stable layer above the boundary layer...
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    American Meteorological Society The Vertical Structure of Linear Coastal-Trapped Disturbances* R. M

  • A Numerical Modeling Study of the Upwelling Source Waters along the Oregon Coast during 2005

    Creator:
    Rivas, David and Samelson, R. M.
    Abstract:
    Regional ocean circulation along the Oregon coast is studied numerically for forcing fields derived from year 2005 and climatological-mean conditions. The primary object is to study directly the Lagrangian pathways by which fluid arrives in the Oregon upwelling zone. Roughly half of the upwelling fluid is found to arrive in...
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    Source Waters along the Oregon Coast during 2005 DAVID RIVAS* AND R. M. SAMELSON College of Oceanic and

  • Parameterizing the natural fluorescence kinetics of Thalassiosira weissflogii

    Creator:
    Laney, Samuel R., Letelier, Ricardo M., and Abbott, Mark R.
    Abstract:
    We examined variability in the natural fluorescence yield of a neritic diatom, Thalassiosira weissflogii, in continuous cultures. In this species, kinetics in natural fluorescence yield over time scales less than a photoperiod were characterized by sharp decreases, occurring at irradiance intensities that presumably coincide with the onset of nonphotochemical fluorescence...
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    Laney, S. R., R. M. Letelier, and M. R. Abbott. Parameterizing the

  • The Martian Zonal-Mean Circulation: Angular Momentum and Potential Vorticity Structure in GCM Simulations

    Creator:
    Barnes, Jeffrey R. and Haberle, Robert M.
    Abstract:
    Analysis of simulations performed with the NASA/Ames Mars GCM shows that under dusty conditions the Northern Hemisphere winter solstice circulation becomes characterized by a zonally averaged state in which the potential vorticity at upper levels is very small outside of high latitudes. The available observational data-in particular the 15-µm observations...
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    Article

  • A Nonlinear Baroclinic Wave-Mean Oscillation with Multiple Normal Mode Instabilities

    Creator:
    Samelson, R. M. and Wolfe, C. L.
    Abstract:
    An unstable, nonlinear baroclinic wave-mean oscillation is found in a strongly supercritical quasigeostrophic f-plane numerical channel model with 3840 Fourier components. The growth of linear disturbances to this time-periodic oscillation is analyzed by computing time-dependent normal modes (Floquet vectors). Two different Newton–Picard methods are used to compute the unstable solution,...
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    E A T M O S P H E R I C S C I E N C E S q 2003 American Meteorological Society NOTES AND

  • Normal-Mode Instabilities of a Time-Dependent Coastal Upwelling Jet

    Creator:
    Durski, S. M., Samelson, R. M., and Allen, J. S.
    Abstract:
    The linear stability of a nearly time-periodic, nonlinear, coastal upwelling–downwelling circulation, over alongshore-uniform topography, driven by a time-periodic wind stress is investigated using numerical methods. The near-periodic alongshore-uniform basic flow is obtained by forcing a primitive equation numerical model of coastal ocean circulation with periodic wind stress. Disturbance growth on...
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    Jet S. M. DURSKI, R. M. SAMELSON, J. S. ALLEN, AND G. D. EGBERT College of Oceanic and Atmospheric

  • Chlorophyll natural fluorescence response to upwelling events in the Southern Ocean

    Creator:
    Letelier, Ricardo M., Abbott, Mark R., and Karl, David M.
    Abstract:
    Variability of solar-induced (natural) fluorescence and chlorophyll were measured on scales of hours to weeks in the upper layer of a cyclonic eddy located south of the Antarctic Polar Front using a free-floating drifter. The fluorescence signal was analyzed both in terms of chlorophyll concentration and as an indicator of...
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