Modelled Recirculation of Pollutants During Ozone Episodes in the Lower Fraser Valley, B. C

Abstract

Recirculation of pollutants is often invoked as a cause of degraded air quality episodes. In this modelling study, we investigated recirculation in order to explore its behaviour in the Lower Fraser Valley (LFV), British Columbia. HYSPLIT was used to produce trajectories from WRF output for seven severe episodes, covering the four main circulation regimes conducive to ozone episodes. Both internal and external recirculations within our domain of interest were observable, but they do not have the same frequency for all regimes. © Springer Science+Business Media Dordrecht 2014.