(BRAVO) Study: Final Report. - Desert Research Institute
(BRAVO) Study: Final Report. - Desert Research Institute
(BRAVO) Study: Final Report. - Desert Research Institute
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<strong>Final</strong> <strong>Report</strong> — September 2004<br />
presentation of merged data is the assumption that the good correspondence in Texas for the<br />
two years also applies to Mexico.)<br />
Sept. & Oct. 1996 & 1999 S<br />
1155<br />
1126<br />
867 998 1272<br />
651 605<br />
1102<br />
1048<br />
610<br />
835<br />
1133<br />
651 1078 1215<br />
875<br />
893<br />
981 1187<br />
1391<br />
1050<br />
989<br />
776 792 943 1199 1200<br />
1386<br />
1109<br />
870 879 1101<br />
1087<br />
903 1048<br />
990 1147 1443<br />
1271<br />
1154 1281<br />
1308 1133<br />
1350<br />
690 750<br />
1350<br />
900<br />
1350<br />
1050<br />
1433 1086<br />
1124<br />
1050 1200<br />
1200 1350 1500 1586<br />
1996 & 1999 means for collocated sites<br />
1224<br />
Site<br />
1996<br />
Big Bend<br />
870<br />
Amistad<br />
1386<br />
Fort Lancaster 1215<br />
Lake Corpus Christi 1281<br />
Everton Ranch 1109<br />
OjinagaPresidio 776<br />
Guadalupe Mts. 605<br />
1999<br />
879<br />
1101<br />
1078<br />
1154<br />
1087<br />
792<br />
651<br />
Figure 10-6. Composite of mean sulfur concentrations (ng/m 3 ) measured during September<br />
and October in 1996 (the preliminary study) and 1999 (the <strong>BRAVO</strong> <strong>Study</strong>).<br />
Figure 10-6 shows that mean fine sulfur concentrations across Texas and Mexico in<br />
September and October were greatest in eastern Texas, near the Carbón plants and around<br />
the Monterrey area (at the southern end of the contours). In general, particulate sulfur<br />
concentrations decreased from east to west.<br />
Returning to the 1999 <strong>BRAVO</strong> measurements alone, the highest fine particulate<br />
sulfur concentrations at Big Bend during the <strong>BRAVO</strong> study period occurred during four<br />
episodes – August 21, September 1-2, September 14-15, and October 12. The Sept. 1-2<br />
episode also had the highest organic carbon and second highest elemental carbon<br />
concentrations of the <strong>BRAVO</strong> study. The spatial concentration patterns for these four<br />
episodes are all different, with the patterns for August 21 and October 12 being the most<br />
similar. The latter two days had higher sulfur concentrations in northeast Texas and around<br />
the Big Bend area while central Texas had lower values. September 15 had the highest sulfur<br />
concentrations around Big Bend and on the southern Gulf Coast while concentrations in<br />
northeast Texas were the lowest in the state. On September 1, the highest sulfur<br />
concentrations were in central Texas with the lowest being in three pockets on the east, far<br />
west, and southwest.<br />
10-9
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