(BRAVO) Study: Final Report. - Desert Research Institute

Final Report — September 2004
Relative Sulfate Contribution (%) (%)
Concentration (µg/m
Concentration (ug/m3)
3
)
10
9
8
7
6
5
4
3
2
1
0
7/6 7/13 7/20 7/27 8/3 8/10 8/17 8/24 8/31 9/7 9/14 9/21 9/28 10/5 10/12 10/19 10/26
120%
100%
80%
60%
40%
20%
0%
7/6 7/13 7/20 7/27 8/3 8/10 8/17 8/24 8/31 9/7 9/14 9/21 9/28 10/5 10/12 10/19 10/26
Texas Mexico East US West US GOCART
Figure 11-10. Daily REMSAD attributions of sulfate concentrations at Big Bend to the four source regions
and the GOCART boundary concentrations, based on the “emissions out” approach. Top: Absolute
concentrations and comparison with measured fine particulate sulfur concentrations (black line). Bottom:
Concentrations relative to base case simulated values (100%).
Sulfate source attributions at the K-Bar site in Big Bend National Park were also
examined on a daily basis. Figure 11-10 displays the simulated daily sulfate contribution by
each source region. In the top panel, the heights of the bars represent the total simulated
sulfate concentration, which can be compared with dots that indicate the daily measured
11-9