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RISThe Atmospheric Circulation Around Antarctica: Linear Stability and Finite-Amplitude Interactions with Migrating Cyclones
Publisher: American Meteorological Society
Abstract: Available observations of the atmospheric circulation over the coast of Antarctica indicate the presence of a core of westerly winds in the upper troposphere. The linear stability of these westerlies is studied by using a ...
Baroclinic Instability of Flows Along Sloping Boundaries
Publisher: American Meteorological Society
Abstract: In the two-layer quasi-geostrophic model with boundaries sloping perpendicular to the basic flow, the ratios of the slopes of the bottom and the top to that of the interface between the fluid layers in the basic state are ...
Topographic Influences on the General Circulation of the Southern Hemisphere: A Numerical Experiment
Publisher: American Meteorological Society
Abstract: A July integration of a GFDL spectral general circulation model is repeated after eliminating from the model the topographic elevations. Zonally averaged. mean fields, regions of frequent Cyclogenesis and cyclone tracks, ...
Seasonal Cycle–El Niño Relationship: Validation of Hypotheses
Publisher: American Meteorological Society
Abstract: The present paper examines ways in which the seasonal cycle influences the evolution of El Niño in the tropical Pacific. The following hypotheses and associated physical mechanisms are investigated: (i) Hypothesis 1 (H1)?the ...
Observations of the Final Warming in the Stratosphere of the Southern Hemisphere during 1979
Publisher: American Meteorological Society
Abstract: The evolution of the flow in the Southern Hemisphere during the period 31 August-10 November 1979 is examined. The final stratospheric warming of 1979 and the associated reversal of the flow above 10 mb occurred during ...
Correlative Evolutions of ENSO and the Seasonal Cycle in the Tropical Pacific Ocean
Publisher: American Meteorological Society
Abstract: This study examines whether shifts between the correlative evolutions of ENSO and the seasonal cycle in the tropical Pacific Ocean can produce effects that are large enough to alter the evolution of the coupled atmosphere?ocean ...
Relationships between Upper-Level Circulation over South America and Rainfall over Southeastern South America: A Physical Base for Seasonal Predictions
Publisher: American Meteorological Society
Abstract: The existence of a significant simultaneous correlation between bimonthly mean precipitation anomalies over southeastern South America (SESA) and either the first or the second (depending on season) leading mode of interannual ...
Streamflow in Southeastern South America and the Southern Oscillation
Publisher: American Meteorological Society
Abstract: The relationship between the Southern Oscillation (SO) and streamflow in two major rivers of southeastern South America (Negro and Uruguay rivers) is explored for the period 1909?1989. It is found that streamflow in both ...
Quasi-Stationary Waves in the Southern Hemisphere. Part II: Generation Mechanisms
Publisher: American Meteorological Society
Abstract: In this Part II the authors investigate the role that Antarctic elevations, the rest of the world orography, thermal forcing from lower latitudes, and the transient eddy component of the flow play on the generation of the ...
Interannual and Interdecadal Variability of the South Atlantic Convergence Zone
Publisher: American Meteorological Society
Abstract: Interannual variations of the summertime (January?March) atmospheric circulation over subtropical South America are examined during the period 1958?97 using the National Centers for Environmental Prediction?National Center ...