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EVALUATION OF THE GAS-PHASE CHEMICAL MECHANISM
Citation:
Carter, W. AND F. Lurman. EVALUATION OF THE GAS-PHASE CHEMICAL MECHANISM. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/3-90/001 (NTIS PB90164526), 1990.
Description:
A program was conducted to evaluate the gas-phase mechanism developed for the Regional Acid Deposition Model (RADM). n initial review of the mechanism was carried out, resulting in several modifications being made prior to its further evaluation. ew methods were developed for processing emissions input for the RADM model and for representing aggregated V0Cs in the model. he mechanism was tested by comparing predictions against results of over 550 environmental chamber experiments carried out at two laboratories. A series of 90 test problems for assessing gas-phase mechanisms in regional models was developed and used to test several condensation approaches for the RADM mechanism. s a result of this study, two modified RADM mechanisms were developed and evaluated. he most important of the modifications concerned the representation of aromatic hydrocarbons. ased on the results of the evaluation, it was concluded that the modified RADM mechanism represents the current state of the art and is suitable for use in a regional acid deposition model. owever, there are still major uncertainties in our understanding of atmospheric chemistry and available chamber data are not sufficient for evaluating many important aspects of regional oxidant mechanisms.
