Local and urban scale modeling - Air Pollution Modeling and Its Application - page 79

range until hour 69 where the FMS drops to 0%. Both HYSPLIT and SCIPUFF
exhibit very similar behavior, with the FMS ranging between ~22% and 60%
through the first 60 h of the simulation.
The time series at times T+24, +36, +48, and +60 of both observed concen-
trations ( Fig. 3 ) and CALPUFF predicted ( Fig. 4) denote significant advection
errors in the CALPUFF predicted evolution of the tracer cloud position. Advection
error accounts for the poorer model performance during the ETEX-1 simulation.
Additional investigation is necessary to understand the source of advection error
in the CALPUFF modeling system.
Fig. 3. Time series of observed concentrations for ETEX-1
Fig. 4. Time series of predicted concentrations for the CALPUFF modeling system for ETEX-1