Development of an Objective Classification Procedure for Bay Area Flow TypesRepresenting Ozone-Related Source-Receptor Relationships

摘要

Air quality and meteorological data collected during a three-year period (1989-1991) in the San Francisco Bay Area and surrounding air basins (North Central Coast, southern portion of the Sacramento Valley and northern and central portions of the San Joaquin Valley) were analyzed to determine air flow patterns and accompanying meteorological conditions associated with high ozone concentrations in the region. A set of six unique source-receptor scenarios were identified. Trajectory analyses were performed for selected days representative of the more common scenarios to determine the principle source-receptor relationships. These results provide an improved understanding of the mechanisms that control ozone concentrations in various portions of the study region. The results are particularly useful for the analysis of interbasin transport, air quality trends, and the selection of episodes to be used for photochemical modeling studies.