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RISInterpretation of Ageostrophic Winds and Implications for Jet Stream Maintenance
Publisher: American Meteorological Society
Abstract: The use of ageostrophic flow to infer the presence of vertical circulations in the entrances and exits of the climatological jet streams is questioned. Problems of interpretation arise because of the use of different ...
Physical Factors Influencing Regional Precipitation Variability Attributed Using an Airmass Trajectory Method
Publisher: American Meteorological Society
Abstract: AbstractA novel Lagrangian framework is developed to attribute monthly precipitation variability to physical processes. Precipitation variability is partitioned into a combination of five factors: airmass origin location, ...
The Storm-Track Response to Idealized SST Perturbations in an Aquaplanet GCM
Publisher: American Meteorological Society
Abstract: The tropospheric response to midlatitude SST anomalies has been investigated through a series of aquaplanet simulations using a high-resolution version of the Hadley Centre atmosphere model (HadAM3) under perpetual equinox ...
The Basic Ingredients of the North Atlantic Storm Track. Part I: Land–Sea Contrast and Orography
Publisher: American Meteorological Society
Abstract: Understanding and predicting changes in storm tracks over longer time scales is a challenging problem, particularly in the North Atlantic. This is due in part to the complex range of forcings (land?sea contrast, orography, ...
Annular Variability and Eddy–Zonal Flow Interactions in a Simplified Atmospheric GCM. Part I: Characterization of High- and Low-Frequency Behavior
Publisher: American Meteorological Society
Abstract: Experiments have been performed using a simplified, Newtonian forced, global circulation model to investigate how variability of the tropospheric jet can be characterized by examining the combined fluctuations of the two ...
The Response of Tropospheric Circulation to Perturbations in Lower-Stratospheric Temperature
Publisher: American Meteorological Society
Abstract: A multiple regression analysis of the NCEP?NCAR reanalysis dataset shows a response to increased solar activity of a weakening and poleward shift of the subtropical jets. This signal is separable from other influences, ...
The Basic Ingredients of the North Atlantic Storm Track. Part II: Sea Surface Temperatures
Publisher: American Meteorological Society
Abstract: he impact of North Atlantic SST patterns on the storm track is investigated using a hierarchy of GCM simulations using idealized (aquaplanet) and ?semirealistic? boundary conditions in the atmospheric component (HadAM3) ...
On the Coupling between Barotropic and Baroclinic Modes of Extratropical Atmospheric Variability
Publisher: American Meteorological Society
Abstract: Abstract The baroclinic and barotropic components of atmospheric dynamics are usually viewed as interlinked through the baroclinic life cycle, with baroclinic growth of eddies connected to heat fluxes, barotropic decay ...
The Role of Eddies in Driving the Tropospheric Response to Stratospheric Heating Perturbations
Publisher: American Meteorological Society
Abstract: A simplified general circulation model has been used to investigate the chain of causality whereby changes in tropospheric circulation and temperature are produced in response to stratospheric heating perturbations. Spinup ...
Further Investigation of the Impact of Idealized Continents and SST Distributions on the Northern Hemisphere Storm Tracks
Publisher: American Meteorological Society
Abstract: uilding on previous studies of the basic ingredients of the North Atlantic storm track (examining land?sea contrast, orography, and SST), this article investigates the impact of Eurasian topography and Pacific SST anomalies ...