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Filtering by: Creator Vanhoff, B. A. Remove constraint Creator: Vanhoff, B. A. Academic Affiliation College of Oceanic and Atmospheric Sciences Remove constraint Academic Affiliation: College of Oceanic and Atmospheric Sciences Has journal sim Journal of Physical Oceanography Remove constraint Has journal sim: Journal of Physical Oceanography

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  • A Modeling Study of Eulerian and Lagrangian Aspects of Shelf Circulation off Duck, North Carolina

    Creator:
    Kuebel Cervantes, B. T., Allen, J. S., and Samelson, R. M.
    Abstract:
    The effects of wind-forced upwelling and downwelling on the continental shelf off Duck, North Carolina, are studied through experiments with a two-dimensional numerical primitive equation model. Moored and shipboard measurements obtained during August–November 1994 as part of the Coastal Ocean Processes (CoOP) Inner Shelf Study (ISS) are used for model–data...
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    velocities for comparison with OCTOBER 2003 2071K U E B E L C E R V A N T E S E T A L . FIG. 1. Across

  • Geographical Variability of the First Baroclinic Rossby Radius of Deformation

    Creator:
    Chelton, Dudley B., deSzoeke, Roland A., Schlax, Michael G., El Naggar, Karim, and Siwertz, Nicolas
    Abstract:
    Global 1° × 1° climatologies of the first baroclinic gravity-wave phase speed c¹ and the Rossby radius of deformation λ1 are computed from climatological average temperature and salinity profiles. These new atlases are compared with previously published 5° × 5° coarse resolution maps of λ₁ for the Northern Hemisphere and...
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    shown in section b of appendix A that an ap- proximate solution for cm can be obtained by the WKB method

  • Turbulence and Mixing in Holmboe Waves

    Creator:
    Smyth, W. D. and Winters, K. B.
    Abstract:
    Motivated by the tendency of high-Prandtl-number fluids to form sharp density interfaces, the authors investigate the evolution of Holmboe waves in a stratified shear flow through direct numerical simulation. Like their better-known cousins, Kelvin–Helmholtz waves, Holmboe waves lead the flow to a turbulent state in which rapid irreversible mixing takes...
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    streamwise (a) velocity and (b) density that define a stratified shear layer [(11), (12)]. In this case, the

  • Eddy–Mean Flow Interaction in Zonal Oceanic Jet Flow along Zonal Ridge Topography

    Creator:
    Witter, Donna L. and Chelton, Dudley B.
    Abstract:
    Motivated by satellite altimeter observations of enhanced sea level variability near steep topographic slopes in the Southern Ocean, effects of topography on the spatial distribution of mesoscale eddies and on eddy–mean flow interaction are investigated using a two-layer, wind-forced, quasigeostrophic channel model. The principal topography, a zonal ridge with a...
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    ] 2 6Q 5 J(Q , c ) 2 c ¹ c 2 A ¹ c , (1b)2 2 2 b 2 6 n]t where Qn, the quasigeostrophic potential

  • 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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    contains a term increasing with b and decreasing with the mean stratification (i.e., decreasing with the

  • Resonant Wind-Driven Mixing in the Ocean Boundary Layer

    Creator:
    Skyllingstad, Eric D., Smyth, W. D., and Crawford, G. B.
    Abstract:
    The role of resonant wind forcing in the ocean boundary layer was examined using an ocean large-eddy simulation (LES) model. The model simulates turbulent flow in a box, measuring ~100–300 m on a side, whose top coincides with the ocean surface. Horizontal boundary conditions are periodic, and time-dependent wind forcing...
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    . Horizontally averaged (a) zonal stress divergence, (b) zonal Coriolis acceleration, (c) meridional stress

  • A Modification of the Garrett–Munk Internal Wave Spectrum

    Creator:
    Levine, Murray D.
    Abstract:
    The Garrett–Munk (GM) spectrum continues to be a useful description of the oceanic internal wave field. However, there are several inconsistencies and ambiguities that make it difficult to use in comparing internal wave fields at different latitudes, stratifications, and water depths. A modified spectral formulation is presented that treats three...
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    . Addressing these problems leads to a substitution of the GM parameters E (nondimensional energy), b (vertical

  • Summertime Coupling between Sea Surface Temperature and Wind Stress in the California Current System

    Creator:
    Chelton, Dudley B., Schlax, Michael G., and Samelson, Roger M.
    Abstract:
    Satellite observations of wind stress and sea surface temperature (SST) are analyzed to investigate ocean–atmosphere interaction in the California Current System (CCS). As in regions of strong SST fronts elsewhere in the World Ocean, SST in the CCS region is positively correlated with surface wind stress when SST fronts are...
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    Stress in the California Current System DUDLEY B. CHELTON College of Oceanic and Atmospheric Sciences

  • 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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    formulation The geometry consists of a square basin of uniform depth on a southern-hemisphere b plane (Fig. 1

  • The Hydraulics of an Evolving Upwelling Jet Flowing around a Cape

    Creator:
    Dale, Andrew C. and Barth, John A.
    Abstract:
    Upwelling jets flow alongshore in approximate geostrophic balance with the onshore pressure gradient induced by coastal upwelling. Observations of such jets have shown that they often move offshore downstream of capes, leaving a pool of upwelled water inshore. Comparisons are made between this behavior and the hydraulic transition of a...
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    upstream propagation. Up- JANUARY 2001 227D A L E A N D B A R T H FIG. 1. Sea surface temperature from