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RISWhat Vertical Mode Does the Altimeter Reflect? On the Decomposition in Baroclinic Modes and on a Surface-Trapped Mode
Publisher: American Meteorological Society
Abstract: This study is motivated by the ongoing debate on the dynamical properties of surface motions at mesoscales that are measured by altimetry [for sea surface height (SSH)] and microwave [for sea surface temperature (SST)]. ...
Moist versus Dry Baroclinic Instability in a Simplified Two-Layer Atmospheric Model with Condensation and Latent Heat Release
Publisher: American Meteorological Society
Abstract: he authors undertake a detailed analysis of the influence of water vapor condensation and latent heat release upon the evolution of the baroclinic instability. The framework consists in a two-layer rotating shallow-water ...
On the Northward Motion of Midlatitude Cyclones in a Barotropic Meandering Jet
Publisher: American Meteorological Society
Abstract: he combined effects of the deformation (horizontal stretching and shearing) and nonlinearities on the beta drift of midlatitude cyclones are studied using a barotropic quasigeostrophic model on the beta plane. It is found ...
Atmospheric Dynamics Triggered by an Oceanic SST Front in a Moist Quasigeostrophic Model
Publisher: American Meteorological Society
Abstract: o understand the atmospheric response to a midlatitude oceanic front, this paper uses a quasigeostrophic (QG) model with moist processes. A well-known, three-level QG model on the sphere has been modified to include such ...
On the Poleward Motion of Midlatitude Cyclones in a Baroclinic Meandering Jet
Publisher: American Meteorological Society
Abstract: he motion of surface depressions evolving in a background meandering baroclinic jet is investigated using a two-layer quasigeostrophic model on a beta plane. Synoptic-scale finite-amplitude cyclones are initialized in the ...
Oceanic Restratification Forced by Surface Frontogenesis
Publisher: American Meteorological Society
Abstract: Potential vorticity (PV) conservation implies a strong constraint on the time evolution of the mean density at a given depth. The authors show that, on an f plane and in the absence of sources and sinks of PV, it only ...
Moist versus Dry Barotropic Instability in a Shallow-Water Model of the Atmosphere with Moist Convection
Publisher: American Meteorological Society
Abstract: ynamical influence of moist convection upon development of the barotropic instability is studied in the rotating shallow-water model. First, an exhaustive linear ?dry? stability analysis of the Bickley jet is performed, ...
A Quasigeostrophic Model for Moist Storm Tracks
Publisher: American Meteorological Society
Abstract: he effect of moisture and latent heat release is investigated in the context of a three-level quasigeostrophic model on the sphere. The model is based on an existing dry model that was shown to be able to reproduce the ...
Nonlinear Generalization of Singular Vectors: Behavior in a Baroclinic Unstable Flow
Publisher: American Meteorological Society
Abstract: Singular vector (SV) analysis has proved to be helpful in understanding the linear instability properties of various types of flows. SVs are the perturbations with the largest amplification rate over a given time interval ...
Comments on “The Gulf Stream Convergence Zone in the Time-Mean Winds”
Publisher: American Meteorological Society
Abstract: AbstractIn a recent study, O?Neill et al. analyzed the divergence of surface winds above the northwest Atlantic. In the time mean, a band of convergence is found, overlying the southern flank of the Gulf Stream. To quantify ...