Search
CSV
RISEffect of Latitudinal Variations in Low-Level Baroclinicity on Eddy Life Cycles and Upper-Tropospheric Wave-Breaking Processes
Publisher: American Meteorological Society
Abstract: An analysis of the potential vorticity gradient and the refractive index in quasigeostrophic (QG) flows on the sphere reveals that the absolute vorticity and the stretching parts have two contradictory effects on the ...
Barotropic Regeneration of Upper-Level Synoptic Disturbances in Different Configurations of the Zonal Weather Regime
Publisher: American Meteorological Society
Abstract: Barotropic dynamics of upper-tropospheric midlatitude disturbances evolving in different configurations of the zonal weather regime (i.e., in different zonal-like large-scale flows) were studied using observational analyses ...
A Dynamical Interpretation of the Poleward Shift of the Jet Streams in Global Warming Scenarios
Publisher: American Meteorological Society
Abstract: he role played by enhanced upper-tropospheric baroclinicity in the poleward shift of the jet streams in global warming scenarios is investigated. Major differences between the twentieth- and twenty-first-century simulations ...
Sensitivity of the Position and Variability of the Eddy-Driven Jet to Different SST Profiles in an Aquaplanet General Circulation Model
Publisher: American Meteorological Society
Abstract: he response of the storm track and eddy-driven jet to various steady sea surface temperature (SST) forcings is analyzed using the aquaplanet configuration of the atmospheric general circulation model Action de Recherche ...
Dynamics of the Northern Annular Mode at Weekly Time Scales
Publisher: American Meteorological Society
Abstract: apid onsets of positive and negative tropospheric northern annular mode (NAM) events during boreal winters are studied using ERA-Interim datasets. The NAM anomalies first appear in the North Pacific from low-frequency ...
The Link between Rossby Wave Breakings and Weather Regime Transitions
Publisher: American Meteorological Society
Abstract: he link between Rossby wave breaking (RWB) and the four wintertime weather regimes over the North Atlantic domain is studied in this paper. Using the 40-yr ECMWF Re-Analysis (ERA-40) data, frequencies of occurrence of ...
A Short-Term Negative Eddy Feedback on Midlatitude Jet Variability due to Planetary Wave Reflection
Publisher: American Meteorological Society
Abstract: three-level quasigeostrophic model on the sphere is used to identify the physical nature of the negative planetary wave feedback on midlatitude jet variability. A first approach consists of studying the nonlinear evolution ...
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 ...
Nonlinear Baroclinic Dynamics of Surface Cyclones Crossing a Zonal Jet
Publisher: American Meteorological Society
Abstract: Mechanisms leading a synoptic surface cyclone to cross an upper-level zonal jet and its subsequent deepening are investigated using a two-layer model on a ? plane. The baroclinic interaction of a low-level circular cyclonic ...
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 ...