HYSPLIT Puff Dispersion & Deposition Modeling

Multiple Large Electric Generating Unit (EGU) Relative Impact Assessment

Sources Modeled Using NOAA Archived Meteorological Data

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The modeling demonstrations shown used actual hourly emission rates of Sulfur Dioxide from electric generating units reporting SO2, NOx, and CO2 emissions data to the federal EPA Acid Rain Program. Chemical conversion was not considered in the modeling exercises. Since it is known that there is significant conversion of gaseous SO2 into particle forms such as sulfates during long range transport in the atmosphere, the concentration and deposition values shown on these hourly plots do not reflect actual expected ambient concentrations or deposition rates from these emissions. The modeling is in a preliminary stage and is being used to identify important time periods when meteorology combined with actual SO2 emissions may create the highest impacts from these electric generating units in the eastern U.S.. The different modeling runs shown below were not all run using the same assumptions about deposition rates. Deposition rates can be set in the model and the different runs shown are based, in each case, on somewhat different values found in the scientific literature.

Please recognize that these are demonstration movies showing the types of modeling activity that the Division is undertaking. They do not necessarily reflect outputs which would accurately represent actual impacts from the sources modeled during these time periods.

Northeast SO2 Concentration 4.7 MB AVI : Group of 11 EGUs ETA July 1999 data from EDAS	East US SO2 Deposition 11.4 MB AVI : 592 EastUS EGUs July 1999 Global Re-Analysis	East US SO2 Concentration 80.8 MB AVI : 592 EastUS EGUs Apr-Jul 1999 Global Re-Analysis

Movies Developed: 4/1/02       Page Last Updated: 2/26/03