Browsing by Author "Allen, J. S."

Alongshore current over variable beach topography

Slinn, Donald N.; Allen, J. S.; Holman, Robert A. (American Geophysical Union, 2000-07-15)

The nonlinear dynamics of unstable alongshore currents in the nearshore surf zone over variable barred beach topography are studied using numerical experiments. These experiments extend the recent studies of Allen et a ...

Assimilation of Surface Current Measurements in a Coastal Ocean Model

Scott, R. K.; Allen, J. S.; Egbert, G. D.; Miller, R. N. (American Meteorological Society, 2010-09)

An idealized, linear model of the coastal ocean is used to assess the domain of influence of surface type data, in particular how much information such data contain about the ocean state at depth and how such information ...

Balance Equations Based on Momentum Equations with Global Invariants of Potential Enstrophy and Energy

Allen, J. S. (American Meteorological Society, 1991-02)

An approximate model for small Rossby number ϵ that is close to the balance equations (BE) but that is based on approximate momentum equations is formulated for a rotating, continuously stratified fluid governed by the h ...

Coastal Trapped Waves in a Stratified Ocean

Allen, J. S. (American Meteorological Society, 1975-04)

A two-layer model is used to study the properties of free coastal trapped waves which propagate over an idealized continental shelf and continental slope bottom topography. With both stratification and depth variations t ...

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

Whitney, Michael M.; Allen, J. S. (American Meteorological Society, 2009-06)

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 wi ...

Coastal Wind-Driven Circulation in the Vicinity of a Bank. Part II: Modeling Flow over the Heceta Bank Complex on the Oregon Coast

Whitney, Michael M.; Allen, J. S. (American Meteorological Society, 2009-06)

This study investigates wind-driven circulation in the vicinity of the Heceta Bank complex along the Oregon shelf. Numerical experiments forced with steady winds (0.1 Pa) are conducted; upwelling and downwelling cases ar ...

Combined Effects of Wind-Driven Upwelling and Internal Tide on the Continental Shelf

Kurapov, A. L.; Allen, J. S.; Egbert, G. D. (American Meteorological Society, 2010-04)

Internal tides on the continental shelf can be intermittent as a result of changing hydrographic conditions associated with wind-driven upwelling. In turn, the internal tide can affect transports associated with upwelli ...

Continental Shelf Waves and Alongshore Variations in Bottom Topography and Coastline

Allen, J. S. (American Meteorological Society, 1976-11)

The effects of alongshore variations in bottom topography and coastline on the wind-stress-forced barotropic motion over a continental shelf and slope are studied. Perturbation methods are used to obtain solutions for fo ...

Diagnosis of the Three-Dimensional Circulation in Mesoscale Features with Large Rossby Number

Shearman, R. Kipp; Barth, John A.; Allen, J. S.; Haney, Robert L. (American Meteorological Society, 2000-11)

Several diagnoses of three-dimensional circulation, using density and velocity data from a high-resolution, upper-ocean SeaSoar and acoustic Doppler current profiler (ADCP) survey of a cyclonic jet meander and adjacent c ...

Downwelling Circulation on the Oregon Continental Shelf. Part I: Response to Idealized Forcing

Allen, J. S.; Newberger, P. A. (American Meteorological Society, 1996-10)

Time-dependent downwelling on the Oregon continental shelf is studied with a two-dimensional approximation, that is, spatial variations across shelf and with depth, using the Blumberg-Mellor, finite-difference, stratifie ...

Dynamics of the Coastal Transition Zone though data assimilation studies

Walstad, Leonard J.; Allen, J. S.; Kosro, P. Michael, 1951-; Huyer, Adriana, 1945- (American Geophysical Union, 1991-08-15)

The dynamics of the coastal transition zone off Northern California during late May and early June 1987 art examined through assimilation modeling studies. A regional baroclinic quasi-geostrophic model is driven by the ...

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

Durski, Scott M.; Allen, J. S. (American Meteorological Society, 2005-09)

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 s ...

The Generation and Propagation of Sea Level Variability Along the Pacific Coast of Mexico

Enfield, David B.; Allen, J. S. (American Meteorological Society, 1983-06)

Case history analysis, cross spectra and multiple regression analysis have been used in a study of low-pass filtered sea level records from the Pacific mainland coast of Mexico in 1971 and 1973–75. During the summer-fall ...

The Generation of Continental Shelf Waves by Alongshore Variations in Bottom Topography

Martell, C. M.; Allen, J. S. (American Meteorological Society, 1979-07)

See Article for Abstract.

Intraseasonal Oscillations in Sea Level along the West Coast of the Americas

Spillane, M. C.; Enfield, D. B.; Allen, J. S. (American Meteorological Society, 1987-03)

Hourly observations of coastal sea level at stations from Peru to British Columbia are analyzed for low-frequency content. A space-time contour plot of sea level, from four years of data during the 1971–75 period, shows ...

Iterated Geostrophic Intermediate Models

Allen, J. S. (American Meteorological Society, 1993-11)

Intermediate models contain physics between that in the primitive equations and that in the quasigeostrophic equations and are capable of representing subinertial frequency motion over O(1) topographic variations typical ...

Large-Scale Sea Level Response to Atmospheric Forcing along the West Coast of North America, Summer 1973

Halliwell, George R.; Allen, J. S. (American Meteorological Society, 1984-05)

Along the west Coast of North America, the response of sea level to fluctuations in alongshore wind stress at large alongshore scales (> 1000 km) accounted for a substantial faction of the total sea level variance during ...

Low-Frequency Baroclinic Waves off Coastal Boundaries

Grimshaw, R.; Allen, J. S. (American Meteorological Society, 1988-08)

See article for abstract.

Mean Flow Generation on a Continental Margin by Periodic Wind Forcing

Denbo, D. W.; Allen, J. S. (American Meteorological Society, 1983-01)

See article for abstract.

Modal Decomposition of the Velocity Field near the Oregon Coast

Kundu, Pijush K.; Allen, J. S.; Smith, Robert L. (American Meteorological Society, 1975-10)

See Article for Abstract.