5.3.3 Spatial and Temporal Scaling

Using both spatial and temporal scaling involves both a Base Year Model File and a Future

Year Model File, and is simply a combination of spatial scaling and temporal scaling, except that

the future year data is used for the spatial scaling. That is, it scales the concentrations of each

neighboring monitor first by the ratio of the modeled concentration at the grid cell in the future

year to the modeled concentration at the grid cell containing the monitor in the future year (spatial

scaling), and then by the ratio of the modeled concentration at the grid cell containing the monitor

in the future year to the modeled concentration at the grid cell containing the monitor in the base

year (temporal scaling). Notice, however, that the two future year concentrations at the grid cell

containing the monitor cancel out, allowing the ratio used to be simply the modeled concentration

at the grid cell in the future year to the modeled concentration at the grid cell containing the

monitor in the base year.

Using both spatial and temporal scaling gives the benefits of both approaches - it both improves

the interpolated estimates of air quality, and provides a future forecast of air quality.

 

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