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RISSignificant Change of Extratropical Natural Variability Associated with Tropical ENSO Anomaly
Publisher: American Meteorological Society
Abstract: The natural variability over the North Pacific, where the influence of tropical El Niño?Southern Oscillation (ENSO) events is substantial, is examined to determine whether there is a large change owing to a difference in ...
Sensitivity of Teleconnection Patterns to the Sign of Their Primary Action Center
Publisher: American Meteorological Society
Abstract: Teleconnection patterns have been extensively investigated, mostly with linear analysis tools. The lesser-known asymmetric characteristics between positive and negative phases of prominent teleconnections are explored here. ...
Effects of Transient Eddies on Blocking Flows: General Circulation Model Experiments
Publisher: American Meteorological Society
Abstract: Prediction of blocking flows by a comprehensive general circulation model is still not satisfactory. A large portion of the unskillful forecasts can be traced to the model's inability to predict the evolution of blocking ...
Low-Frequency Anomalies in the NMC MRF Model and Reality
Publisher: American Meteorological Society
Abstract: A low-resolution version of the National Meteorological Center's global spectral model was used to generate a 10-year set of simulated daily meteorological data. Wintertime low-frequency large-amplitude anomalies were ...
Asymmetric Impact of Tropical SST Anomalies on Atmospheric Internal Variability over the North Pacific
Publisher: American Meteorological Society
Abstract: A substantial asymmetric impact of tropical Pacific SST anomalies on the internal variability of the extratropical atmosphere is found. A variety of diagnoses is performed to help reveal the dynamical processes leading to ...
Atmospheric Predictability of Seasonal, Annual, and Decadal Climate Means and the Role of the ENSO Cycle: A Model Study
Publisher: American Meteorological Society
Abstract: The characteristics of extratropical low-frequency variability are examined using a comprehensive atmospheric general circulation model. A large experiment consisting of 13 45-yr-long integrations forced by prescribed sea ...
Forecast Skill and Low-Frequency Variability in NMC DERF90 Experiments
Publisher: American Meteorological Society
Abstract: A series of 90-day integrations by a low-resolution version (T40) of the National Meteorological Center's global spectral model was analyzed for its performance as well as its low-frequency variability behavior. In particular, ...
Dynamical Extended Range Forecasting (DERF) at the National Meteorological Center
Publisher: American Meteorological Society
Abstract: Early results are presented of an experimental program in Dynamical Extended Range Forecasting at the National Meteorological Center. The primary objective of this program is to assess the feasibility of extending operational ...
Present-Day Capabilities of Numerical and Statistical Models for Atmospheric Extratropical Seasonal Simulation and Prediction
Publisher: American Meteorological Society
Abstract: A statistical model and extended ensemble integrations of two atmospheric general circulation models (GCMs) are used to simulate the extratropical atmospheric response to forcing by observed SSTs for the years 1980 through ...