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RISA Case Study of the Effects of Topography on Cyclone Development in the Western United States
Publisher: American Meteorological Society
Abstract: A mesoscale model has been used to simulate an observed trough system which crossed the Rocky Mountains between 24 and 27 March 1983. Numerical simulations have been conducted with and without topography to isolate the ...
The Climatological Skill of a Regional Model over Complex Terrain
Publisher: American Meteorological Society
Abstract: As part of an ongoing study of the regional climate and hydrology of the southwestern United States, in this paper we investigate the systematic biases of two versions of the PSU/NCAR mesoscale model (MM4). These are a ...
Comparison of Simulated Cloud Cover with Satellite Observations over the Western United States
Publisher: American Meteorological Society
Abstract: Satellite image datasets and regional climate model results are intercompared for evaluation of model accuracy in the simulation of cloud cover. Both monthly average and individual simulation times are analyzed. To provide ...
Mass and Angular Momentum Diagnostics of Cyclones within Numerically Simulated Linear Baroclinic Waves
Publisher: American Meteorological Society
Abstract: The mass and angular momentum budgets of extratropical cyclones within three numerically simulated adiabatic linear baroclinic waves are investigated through quasi-Lagrangian diagnostics. The waves analyzed, wavenumbers ...
The Effect of CO2 Concentration on the Frequency of Blocking in a General Circulation Model Coupled to a Simple Mixed Layer Ocean Model
Publisher: American Meteorological Society
Abstract: The effect of a doubling of atmospheric CO2 on the characteristics of the 500 mb height field and persistent height anomalies associated with blocking phenomena are investigated in two experiments with the NCAR Community ...
The Climatology of Blocking Events in a Perpetual January Simulation of a Spectral General Circulation Model
Publisher: American Meteorological Society
Abstract: A variety of statistical comparisons is made between the fluctuations occurring in a 1200-day perpetual January simulation of a spectral general circulation model and those occurring in a 20-winter data set. Attention is ...
Simulation of the Arid Climate of the Southern Great Basin Using a Regional Climate Model
Publisher: American Meteorological Society
Abstract: As part of the development effort of a regional climate model (RCM)for the southern Great Basin, this paper present savalidation analysis of the climatology generated by a high-resolution RCM driven by observations. The ...
Central U.S. Springtime Precipitation Extremes: Teleconnections and Relationships with Sea Surface Temperature
Publisher: American Meteorological Society
Abstract: Dynamical methods are used to investigate atmospheric teleconnections associated with extreme seasonal precipitation anomalies over the central United States during April?June. The importance of sea surface temperature ...
Analog Probabilistic Precipitation Forecasts Using GEFS Reforecasts and Climatology-Calibrated Precipitation Analyses
Publisher: American Meteorological Society
Abstract: nalog postprocessing methods have previously been applied using precipitation reforecasts and analyses to improve probabilistic forecast skill and reliability. A modification to a previously documented analog procedure is ...
Development of a Second-Generation Regional Climate Model (RegCM2). Part I: Boundary-Layer and Radiative Transfer Processes
Publisher: American Meteorological Society
Abstract: During the last few years the development of a second-generation regional climate modeling system (RegCM2) has been completed at the National Center for Atmospheric Research (NCAR). Based upon the National Center for ...