Abstract: Some recent analyses of long-range transport and dispersion indicated conflicting results regarding the improvement in trajectory calculations when either the spatial or temporal density of the meteorological data are ...

Abstract: A three-dimensional primative equation model was used to simulate the low-level wind field, given the urban heat island as the lower temperature boundary condition. The specification of the average heat island bypassed the ...

Abstract: The recent solo transpacific balloon flight was used as a test case to evaluate multiple trajectory techniques to select different pathways based upon potential variations in balloon altitudes. Altitude changes between 3 ...

Abstract: The data from a yearlong tracer dispersion experiment over Washington, D.C., in 1984 were used to evaluate Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) dispersion model calculations using coarse global ...

Abstract: Aircraft tracer measurements all made within 300 km of the release sites during, the Across North America Experiment (ANATEX) provided 30 separate trials to evaluate the error of back-trajectory calculations. The trajectory ...

Abstract: A Lagrangian transport and dispersion model was modified to generate multiple simulations from a single meteorological dataset. Each member of the simulation was computed by assuming a ±1-gridpoint shift in the horizontal ...

Abstract: Meteorological data fields from NOAA's Nested Grid Model (NGM) were archived at 2-hour intervals from initialization to the 12-hour forecast time, two forecasts per day, for January, February, and March 1987. The NGM ...

Abstract: A computer model using actual meteorological data is developed to simulate the effects of wind shear on an instantaneous pollutant puff. The effect of wind shear on dispersion is obtained by subdividing, during the nocturnal ...

Abstract: Perfluorocarbon tracer concentration profiles measured by aircraft 600?900 km downwind of the release locations during CAPTEX are discussed and compared with some model results. In general, the concentrations decreased ...

Abstract: Initialization and forecast fields from the National Weather Service's (NWS) Nested Grid Model (NOM) were archived on the 90 km calculational grid at 2-hour intervals out to 12 hours twice per day, for the 3-month period ...