Geoscience Reference
In-Depth Information
120
100
80
60
40
20
0
9/13/99
9/14/99
9/15/99
9/16/99
9/17/99
9/18/99
9/19/99
9/20/99
Date
Minimum to Maximum Range
Observed
Predicted
Fig. 2. Temporal representation of hourly ozone concentrations at a monitoring site in
Corpus Christi, Texas.
4.2
. Spatial impact of perturbed temperature
on peak ozone concentrations
The spatial differences in emission distributions over the entire South
Texas region have been summarized in Table 1. Although the peak ozone
concentrations declined substantially in the South Texas region compared to
the base case, the temperature perturbations radically impact future ozone
concentrations. It was found that a 6
◦
C perturbation produces the largest
increase of
12 ppb from the unperturbed case over the San Antonio region
and the counties bordering Houston-Galveston area. Austin exhibited an
increase of 9-12 ppb, as shown in Fig. 3. Corpus Christi revealed a maximum
∼
Fig. 3. Spatial distribution of the differences in episode maxima of 8-h ozone
concentrations between the base case and the perturbed temperature (6
◦
C) case.
