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RISOn Improving 4-km Mesoscale Model Simulations
Publisher: American Meteorological Society
Abstract: A previous study showed that use of analysis-nudging four-dimensional data assimilation (FDDA) and improved physics in the fifth-generation Pennsylvania State University?National Center for Atmospheric Research Mesoscale ...
A Numerical Study of Appalachian Cold-Air Damming and Coastal Frontogenesis
Publisher: American Meteorological Society
Abstract: A 24-h numerical simulation is used to study features of the wedge-shaped pressure ridge and the coastal front, which occur in eastern United States during winter and often cause substantial errors in operational models. ...
Use of Four-Dimensional Data Assimilation in a Limited-Area Mesoscale Model. Part I: Experiments with Synoptic-Scale Data
Publisher: American Meteorological Society
Abstract: A four-dimensional data assimilation (FDDA) scheme based on Newtonian relaxation or ?nudging? is tested using standard rawinsonde data in the Penn State/NCAR limited-area mesoscale model. It is imperative that we better ...
Multiscale Four-Dimensional Data Assimilation
Publisher: American Meteorological Society
Abstract: Four-dimensional data assimilation (FDDA) schemes capable of effectively analyzing asynoptic, near-continuous data streams art especially important on the mesobeta scale for both model initialization and dynamic analysis. ...
Use of Four-Dimensional Data Assimilation in a Limited-Area Mesoscale Model Part II: Effects of Data Assimilation within the Planetary Boundary Layer
Publisher: American Meteorological Society
Abstract: A four-dimensional data assimilation (FDDA) scheme based on Newtonian relaxation or nudging has been developed and evaluated in the Pennsylvania State University/National Center for Atmospheric Research (PSU/NCAR) Limited-Area ...
Improving Short-Term Numerical Weather Prediction in the California Coastal Zone by Dynamic Initialization of the Marine Boundary Layer
Publisher: American Meteorological Society
Abstract: Few data are available over the world?s oceans to characterize the initial atmospheric state in numerical models. Objective analysis in these regions is largely based on forecast fields obtained from a global model and ...
A Multiscale Four-Dimensional Data Assimilation System Applied in the San Joaquin Valley during SARMAP. Part I: Modeling Design and Basic Performance Characteristics
Publisher: American Meteorological Society
Abstract: This paper presents results of numerical simulations made with a high-resolution multiscale four-dimensional data assimilation system applied over California during two episodes associated with high ozone concentrations ...
A Heuristic Study on the Importance of Anisotropic Error Distributions in Data Assimilation
Publisher: American Meteorological Society
Abstract: A challenging problem in numerical weather prediction is to optimize the use of meteorological observations in data assimilation. Even assimilation techniques considered ?optimal? in the ?least squares? sense usually involve ...
Ensemble Variance Calibration for Representing Meteorological Uncertainty for Atmospheric Transport and Dispersion Modeling
Publisher: American Meteorological Society
Abstract: In the event of the release of a dangerous atmospheric contaminant, an atmospheric transport and dispersion (ATD) model is often used to provide forecasts of the resulting contaminant dispersion affecting the population. ...
Submeso Motions within the Stable Boundary Layer and Their Relationships to Local Indicators and Synoptic Regime in Moderately Complex Terrain
Publisher: American Meteorological Society
Abstract: o better understand the physical processes of the stable boundary layer and to quantify ?submeso motions? in moderately complex terrain, exploratory case-study analyses were performed using observational field data ...