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  • The Materiality and Neutrality of Neutral Density and Orthobaric Density

    Creator:
    de Szoeke, Roland A. and Springer, Scott R.
    Abstract:
    The materiality and neutrality of neutral density and several forms of orthobaric density are calculated and compared using a simple idealization of the warm-sphere water mass properties of the Atlantic Ocean. Materiality is the value of the material derivative, expressed as a quasi-vertical velocity, following the motion of each of...
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    Density and Orthobaric Density ROLAND A. DE SZOEKE AND SCOTT R. SPRINGER* College of Oceanic and

  • An Improved Bound for the Complex Phase Speed of Baroclinic Instability

    Creator:
    de Szoeke, Roland A.
    Abstract:
    An improved bound is obtained for the radius of the semicircle in the complex plane containing the complex phase speed of baroclinically unstable plane wave disturbances. In the limit of long waves, this bound contains a term increasing with β and decreasing with the mean stratification (i.e., decreasing with the...
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    problem. Dyn. Atmos. Oceans, 12, 71–80. Chelton, D. B., R. A. de Szoeke, M. G. Schlax, K. El Naggar, and

  • 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...
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    : Diapycnal mixing in the ocean: The Osborn–Cox model. J. Phys. Oceanogr., 24, 2560–2576. de Szoeke, R. A

  • A Model of Wind- and Buoyancy-Driven Ocean Circulation

    Creator:
    de Szoeke, Roland A.
    Abstract:
    A layered model of steady geostrophic ocean circulation driven by wind stress and buoyancy flux at the surface is derived. Potential vorticity, or thickness, of the two near-surface layers is driven by Ekman pumping and buoyancy pumping. The latter is represented as a flow of mass proportional to the modified...
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    Article

  • On the Effects Of Horizontal Variability of Wind Stress on the Dynamics of the Ocean Mixed Layer

    Creator:
    de Szoeke, Roland A.
    Abstract:
    The one-dimensional bulk mixed-layer model of Niiler (1975) is extended to two (or three) dimensions to take account of horizontal variation in wind stress on mixed-layer dynamics. Both surface stirring (Kraus and Turner, 1967) and bulk shear (Pollard et al., 1973) entrainment mechanisms are included. The development of horizontal structure...
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    Article

  • Equations of Motion Using Thermodynamic Coordinates

    Creator:
    de Szoeke, Roland A.
    Abstract:
    The forms of the primitive equations of motion and continuity are obtained when an arbitrary thermodynamic state variable--restricted only to be vertically monotonic--is used as the vertical coordinate. Natural generalizations of the Montgomery and Exner functions suggest themselves. For a multicomponent fluid like seawater the dependence of the coordinate on...
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    ; Higdon and de Szoeke 1997). 2818 VOLUME 30J O U R N A L O F P H Y S I C A L O C E A N O G R A P H Y a

  • An Effect of the Thermobaric Nonlinearity of the Equation of State: A Mechanism for Sustaining Solitary Rossby Waves

    Creator:
    de Szoeke, Roland A.
    Abstract:
    The thermobaric nonlinearity in the equation of state for seawater density—namely, the dependence of thermal expansibility on pressure—coupled with spatial variation of the oceanic temperature–salinity (θ–s) relation generates a nonlinear behavior in the buoyant force that can counter the linear dispersion of baroclinic Rossby waves and produce solitary waves. A...
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    . Chelton, D. B., R. A. de Szoeke, M. G. Schlax, K. El Naggar, and N. Siwertz, 1998: Geographical

  • Effects of Alongshore Wind Stress at the Eastern Boundary on Circulation in the Ocean Pycnocline

    Creator:
    de Szoeke, Roland A.
    Abstract:
    An alongshore wind stress is applied at the eastern boundary of an ocean model, and its effects on the structure of the circulation in the ventilated pycnocline are studied. The offshore surface Ekman flow associated with such a wind is taken to be balanced by onshore geostrophic transport distributed over...
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    Article

  • Orthobaric Density: A Thermodynamic Variable for Ocean Circulation Studies

    Creator:
    de Szoeke, Roland A., Springer, Scott R., and Oxilia, David M.
    Abstract:
    A new density variable, empirically corrected for pressure, is constructed. This is done by first fitting compressibility (or sound speed) computed from global ocean datasets to an empirical function of pressure and in situ density (or specific volume). Then, by replacing true compressibility by this best-fit virtual compressibility in the...
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    Thermodynamic Variable for Ocean Circulation Studies ROLAND A. DE SZOEKE, SCOTT R. SPRINGER, AND DAVID M

  • Semigeostrophic Wind-Driven Thermocline Upwelling at a Coastal Boundary

    Creator:
    Samelson, Roger M. and de Szoeke, Roland A.
    Abstract:
    We formulate analytically and solve numerically a semigeostrophic model for wind-driven thermocline upwelling at a coastal boundary. The model has a variable-density entraining mixed layer and two homogeneous interior layers. All variables are uniform alongshore. The wind stress and surface heating are constant. The system is started from rest, with...
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