Index Catalog // ScholarsArchive@OSU

Finite-Amplitude Evolution of Instabilities Associated with the Coastal Upwelling Front

Creator:: Durski, Scott M. and Allen, J. S.
Abstract:: A primitive equation model is used to study the finite-amplitude evolution of instabilities associated with the coastal upwelling front. Simulations of increasing complexity are examined that represent idealizations of summer conditions off the Oregon coast, including cases with steady and with time-variable wind in a domain with alongshore-uniform bathymetry and...
Resource Type:: Article
Full Text:: Coastal Upwelling Front SCOTT M. DURSKI AND J. S. ALLEN College of Oceanic and Atmospheric Sciences

Coastal Wind-Driven Circulation in the Vicinity of a Bank. Part I: Modeling Flow over Idealized Symmetric Banks

Creator:: Whitney, Michael M. and Allen, J. S.
Abstract:: This study examines how coastal banks influence wind-driven circulation along stratified continental shelves. Numerical experiments are conducted for idealized symmetric banks; the standard bank (200 km long and 50 km wide) has dimensions similar to the Heceta Bank complex along the Oregon shelf. Model runs are forced with 10 days...
Resource Type:: Article
Full Text:: Marine Sciences, University of Connecticut, Groton, Connecticut J. S. ALLEN College of Oceanic and

A dye tracer reveals cross-shelf dispersion and interleaving on the Oregon shelf

Creator:: Dale, A. C., Levine, Murray D., Barth, John A., and Austin, J. A.
Abstract:: A fluorescent dye tracer was injected into the pycnocline on the Oregon shelf at a depth of 9–10 m. It spread rapidly cross-shelf as two distinct layers, one above the other in the water column, split by interleaving dye-free water. The vertical scale of these layers, and associated density steps,...
Resource Type:: Article
Full Text:: mixing, J. Phys. Oceanogr., 30, 805–832. Allen, J. S., P. A. Newberger, and J. Federiuk (1995

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...
Resource Type:: Article
Full Text:: Jet S. M. DURSKI, R. M. SAMELSON, J. S. ALLEN, AND G. D. EGBERT College of Oceanic and Atmospheric

Distribution and variability of iron input to Oregon coastal waters during the upwelling season

Creator:: Chase, Zanna, Hales, Burke, Cowles, Timothy J., Schwartz, Roseanne, and van Geen, Alexander
Abstract:: We measured iron concentrations off the Oregon coast in spring (May–June) and summer (August) of 2001 as part of the Coastal Ocean Advances in Shelf Transport (COAST) program. Dissolvable and total dissolvable iron levels in surface waters were generally higher in spring (mean of 2.1 and 33.9 nmol L¯¹, respectively)...
Resource Type:: Article
Full Text:: ., B. Hales, T. J. Cowles, R. Schwartz, and A. van Green (2005), Distribution and variability of iron

Atmosperic CO₂ uptake by a coastal upwelling system

Creator:: Hales, Burke, Takahashi, Taro, and Bandstra, Leah M.
Abstract:: A biological pump for transferring atmospheric CO₂ to deep ocean regimes has been identified in the upwelling zone of the U.S. Pacific coast off Oregon using high-resolution measurements of Pco₂ and nutrient concentrations that were made in May through August 2001. Surface water over most of the shelf was a...
Resource Type:: Article
Full Text:: . S., P. A. Newberger, and J. Federiuk (1995), Upwelling off the Oregon continental shelf: I. Response

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:: Commerce. REFERENCES Allen, J. S., P. A. Newberger, and J. Federiuk, 1995: Upwelling circulations on the

Modeling study of turbulent mixing over the continential shelf : comparison of turbulent closure schemes

Creator:: Wijesekera, H. W., Allen, John S., and Newberger, P. A.
Abstract:: The sensitivity of model-produced time-dependent wind-driven circulation on the continental shelf to the turbulent closure scheme employed is studied with a twodimensional approximation (variations across-shelf and in depth) using the Princeton Ocean Model. The level 2.5 Mellor-Yamada closure (MY), k-ε closure, and K-Profile Parameterization schemes are used to evaluate the...
Resource Type:: Article
Full Text:: continental shelf: Comparison of turbulent closure schemes H. W. Wijesekera, J. S. Allen, and P. A

Ecosystem response to upwelling off the Oregon coast: Behavior of three nitrogen-based models

Creator:: Spitz, Yvette, Newberger, Priscilla A., and Allen, John S.
Abstract:: The behavior of three ecosystem models is analyzed for upwelling off the Oregon coast as a function of the number of model components. The first ecosystem model includes dissolved inorganic nitrogen-phytoplankton-zooplankton (NPZ), the second (NPZD) adds detritus, and the third (NNPZD) splits the nutrients into nitrate and ammonium. The models...
Resource Type:: Article
Full Text:: coast: Behavior of three nitrogen-based models Y. H. Spitz, P. A. Newberger, and J. S. Allen College

Irreversible nitrate fluxes due to turbulent mixing in a coastal upwelling system

Creator:: Hales, Burke, Moum, James N., Covert, P., and Perlin, A.
Abstract:: Detailed and repeated measurements of nitrate across the Oregon shelf, made coincident with turbulence measurements, reveal the importance of cross-isopycnal mixing via turbulence in providing nitrate to the upper water column. Spatial distributions of vertical gradients and turbulent fluxes in the Oregon coastal ocean reveal variability that could not have...
Resource Type:: Article
Full Text:: J. Federiuk (1995), Upwelling off the Oregon continental shelf. Part I: Response to idealized

ScholarsArchive@OSU

Finite-Amplitude Evolution of Instabilities Associated with the Coastal Upwelling Front

Coastal Wind-Driven Circulation in the Vicinity of a Bank. Part I: Modeling Flow over Idealized Symmetric Banks

A dye tracer reveals cross-shelf dispersion and interleaving on the Oregon shelf

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

Distribution and variability of iron input to Oregon coastal waters during the upwelling season

Atmosperic CO₂ uptake by a coastal upwelling system

Numerical Simulation of Air–Sea Coupling during Coastal Upwelling

Modeling study of turbulent mixing over the continential shelf : comparison of turbulent closure schemes

Ecosystem response to upwelling off the Oregon coast: Behavior of three nitrogen-based models

Irreversible nitrate fluxes due to turbulent mixing in a coastal upwelling system

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