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RISLarge-Scale Propagating Disturbances: Approximation by Vertical Normal Modes
Publisher: American Meteorological Society
Abstract: Propagating features and waves occur everywhere in the ocean. This paper derives a concise description of how such small-amplitude, large-scale oceanic internal disturbances propagate dynamically against a slowly varying ...
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Publisher: American Meteorological Society
Long Extratropical Planetary Wave Propagation in the Presence of Slowly Varying Mean Flow and Bottom Topography. Part I: The Local Problem
Publisher: American Meteorological Society
Abstract: One of the most successful theories to date to explain why observed planetary waves propagate westward faster than linear flat-bottom theory predicts has been to include the effect of background baroclinic mean flow, which ...
Long Extratropical Planetary Wave Propagation in the Presence of Slowly Varying Mean Flow and Bottom Topography. Part II: Ray Propagation and Comparison with Observations
Publisher: American Meteorological Society
Abstract: Ray theory is used to predict phase and group velocities for long planetary waves under realistic, albeit slowly varying, oceanic conditions. The results are compared with local theory using fields smoothed to the same ...
The Effect of Bottom Topography on the Speed of Long Extratropical Planetary Waves
Publisher: American Meteorological Society
Abstract: This paper examines how slowly varying topography induces changes in all aspects of long planetary wave propagation, including phase speed and surface signature, through steering effects. The approach introduces a method ...
The Dispersion Relation for Planetary Waves in the Presence of Mean Flow and Topography. Part I: Analytical Theory and One-Dimensional Examples
Publisher: American Meteorological Society
Abstract: An eigenvalue problem for the dispersion relation for planetary waves in the presence of mean flow and bottom topographic gradients is derived, under the Wentzel?Kramers?Brillouin?Jeffreys (WKBJ) assumption, for frequencies ...
Planetary Wave Response to Surface Forcing and Instability in the Presence of Mean Flow and Topography
Publisher: American Meteorological Society
Abstract: The local response of an ocean with slowly varying mean flow, stratification, and topography to two sources of disturbance is examined, concentrating on whether the resulting surface elevations are observable. The first ...
The Dispersion Relation for Planetary Waves in the Presence of Mean Flow and Topography. Part II: Two-Dimensional Examples and Global Results
Publisher: American Meteorological Society
Abstract: The one-dimensional examples of the dispersion relation for planetary waves under the Wentzel?Kramers?Brillouin?Jeffreys (WKBJ) assumption given in Part I are extended to two dimensions and analyzed globally. The dispersion ...
Interdecadal Variability of the Southern Ocean
Publisher: American Meteorological Society
Abstract: The intrinsic variability of the Antarctic Circumpolar Current is investigated using an idealized wind-driven model. The model uses three quasigeostrophic layers, with steady wind stress forcing, and no diabatic effects. ...
Subannual, Seasonal, and Interannual Variability of the North Atlantic Meridional Overturning Circulation
Publisher: American Meteorological Society
Abstract: An eddy-permitting numerical ocean model is used to investigate the variability of the meridional overturning circulation (MOC). Both wind stress and fluctuations of the seawater density contribute to MOC changes on subannual ...