Numerical Simulations of Photochemical Air Pollution in the Northeastern United States: ROM1 (Regional Oxident Model) Applications

摘要

The first-generation Regional Oxidant Model (ROM1) was used to simulate pollutant concentrations during the nine-day period 23-31 July 1980. The one-hour and daily daylight (0900-1600 LST) averaged ozone concentrations produced in each of two simulations, one representing 1980 base emissions and the other projected 1987 emission, were compared to assess the effectiveness of the proposed emissions changes on air quality. The analyses of the model results are prefaced by discussions of a number of basic issues on regional scale modeling, including model initialization, selection of meteorological data, effects of grid size on model performance, estimating long-term concentration statistics from short-period simulations, probabilistic vs. quasi-deterministic modes of model operation, uncertainty in emissions estimates, the characteristics of VOC and NOx sources in the Northeast, and other topics. Preliminary results of analyses of the SAROAD monitoring data, which reveal the characteristics of the ozone problem in the northeastern United States, set the stage for the model simulations.