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RISInterdecadal Changes in Atmospheric Low-Frequency Variability with and without Boundary Forcing
Publisher: American Meteorological Society
Abstract: The response of the Max Planck Institute?s ECHAM3 atmospheric general circulation model to a prescribed decade-long positive anomaly in sea surface temperatures (SSTs) over the North Atlantic is investigated. Two 10-yr ...
Bimodal Behavior in the Zonal Mean Flow of a Baroclinic β-Channel Model
Publisher: American Meteorological Society
Abstract: The dynamical origin of midlatitude zonal-jet variability is examined in a thermally forced, quasigeostrophic, two-layer channel model on a ? plane. The model?s behavior is studied as a function of the bottom-friction ...
Multiple Regimes and Low-Frequency Oscillations in the Northern Hemisphere’s Zonal-Mean Flow
Publisher: American Meteorological Society
Abstract: This paper studies multiple regimes and low-frequency oscillations in the Northern Hemisphere zonal-mean zonal flow in winter, using 55 yr of daily observational data. The probability density function estimated in the phase ...
Low-Frequency Variability in a Baroclinic β Channel with Land–Sea Contrast
Publisher: American Meteorological Society
Abstract: Atmospheric low-frequency variability (LFV) is studied in a two-layer quasigeostrophic model. The model geometry is a periodic ? channel with flat bottom and zonally inhomogeneous thermal forcing. As a result of the idealized ...
A Hierarchy of Data-Based ENSO Models
Publisher: American Meteorological Society
Abstract: Global sea surface temperature (SST) evolution is analyzed by constructing predictive models that best describe the dataset?s statistics. These inverse models assume that the system?s variability is driven by spatially ...
Predictability of Recurrent Weather Regimes over North America during Winter from Submonthly Reforecasts
Publisher: American Meteorological Society
Abstract: AbstractFour recurrent weather regimes are identified over North America from October to March through a k-means clustering applied to MERRA daily 500-hPa geopotential heights over the 1982?2014 period. Three regimes ...
Simulation of the Tropical Pacific Climate with a Coupled Ocean-Atmosphere General Circulation Model. Part II: Interannual Variability
Publisher: American Meteorological Society
Abstract: Two multiyear simulations with a coupled ocean-atmosphere general circulation model (GCM)-totaling 45 years-are used to investigate interannual variability at the equator. The model consists of the UCLA global atmospheric ...
Cross–Time Scale Interactions and Rainfall Extreme Events in Southeastern South America for the Austral Summer. Part I: Potential Predictors
Publisher: American Meteorological Society
Abstract: he physical mechanisms and predictability associated with extreme daily rainfall in southeastern South America (SESA) are investigated for the December?February season in a two-part study. Through a k-mean analysis, this ...
Cross–Time Scale Interactions and Rainfall Extreme Events in Southeastern South America for the Austral Summer. Part II: Predictive Skill
Publisher: American Meteorological Society
Abstract: otential and real predictive skill of the frequency of extreme rainfall in southeastern South America for the December?February season are evaluated in this paper, finding evidence indicating that mechanisms of climate ...
Simulation of the Tropical Pacific Climate with a Coupled Ocean-Atmosphere General Circulation Model. Part I: The Seasonal Cycle
Publisher: American Meteorological Society
Abstract: A multiyear simulation with a coupled ocean-atmosphere general circulation model (GCM) is presented. The model consists of the UCLA global atmospheric GCM coupled to the GFDL oceanic GCM; the latter is dynamically active ...