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Comparisons of the Response of Simulated Ozone Concentrations to Changes in Emissions Using the Carbon Bond IV and SAPRC99 Chemical Mechanisms Bruce Jackson,

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Presentation on theme: "Comparisons of the Response of Simulated Ozone Concentrations to Changes in Emissions Using the Carbon Bond IV and SAPRC99 Chemical Mechanisms Bruce Jackson,"— Presentation transcript:

1 Comparisons of the Response of Simulated Ozone Concentrations to Changes in Emissions Using the Carbon Bond IV and SAPRC99 Chemical Mechanisms Bruce Jackson, Eugene Yang, Ajith Kaduwela, and William Vance California Environmental Protection Agency/Air Resources Board Planning and Technical Support Division California Air Resources Board/PTSD April, 2005

2 Alternative Chemical Mechanisms Carbon Bond IV (Gery, et. al., 1989) 32 Chemical Species 92 Chemical Reactions SAPRC99f (Carter, et. al., 2000) 76 Chemical Species 217 Chemical Reactions * the number of chemical species and reactions may vary among the different air quality models. California Air Resources Board/PTSD April, 2005

3 Southern California Ozone Study (SCOS) August 5, 1997 -- Subregion 04 CALGRID Air Quality Model -- Updated to SAPRC99f 116x80x16 Cells -- Simulation begun August 2 04 Pacific Ocean California Air Resources Board/PTSD April, 2005

4 03 06 08 Central California Ozone Study (CCOS) July 31-August 02, 2000 -- Subregions 03, 06, and 08 CAMx Air Quality Model 185x185x16 Cells -- Simulation Begun July 29 Pacific Ocean California Air Resources Board/PTSD April, 2005

5 Obs. Sim. Net Gross Pk. Pk Bias Error ppb ppb % % CALGRID/CB4 187 142 -08 28 CALGRID/S99f 187 157 +03 29 CALGRID Ozone Model Performance for August 5, 1997 in Subregion 04 of the SCOS Domain * highlighted results met USEPA (1991) air quality model performance guidelines California Air Resources Board/PTSD April, 2005

6 Jul 31 Aug 01 Aug 02 UPkR NB UPkR NB UPKR NB ppb % ppb % ppb % CAMx/CB4 Model Zone 03 0.94 +02 1.02 -10 0.84 -43 Zone 06 1.28 +07 1.02 -04 0.99 -15 Zone 08 1.03 -12 0.98 -15 0.85 -15 CAMx/S99f Model Zone 03 1.09 -03 1.07 -04 1.14 -46 Zone 06 1.39 +12 1.03 -07 1.06 -11 Zone 08 1.09 -03 1.07 -04 0.96 -05 CAMx Ozone Model Performance for the July/August, 2000 CCOS Episode * highlighted results met USEPA (1991) air quality model performance guidelines California Air Resources Board/PTSD April, 2005

7 Maximum Daily Ozone Concentrations (ppb) as Functions of ROG and NOx Emissions Reductions for August 5, 1997 in Subregion 04 of the SCOS Domain Using CALGRID/CBIV * ozone concentration contours are 20 ppb. California Air Resources Board/PTSD April, 2005

8 CALGRID/CBIV CALGRID/SAPRC99f Daily Maximum Ozone Concentration (ppb) Simulated in Subregion 04 of the SCOS Domain, on August 5, 1997 California Air Resources Board/PTSD April, 2005

9 Differences (SAPRC99f - CBIV) Between Maximum Ozone Concentrations (ppb) Simulated in Subregion 04 on August 5, 1997 within the SCOS Domain * positive differences are marked with solid lines, negative differences are marked with dashed lines. Contour intervals are 2 ppb ozone. California Air Resources Board/PTSD April, 2005

10 * positive differences are marked with solid lines, negative differences are marked with dashed lines. Contour intervals are 2 ppb ozone. Differences (SAPRC99f - CBIV) Between Maximum Ozone Concentrations (ppb) Simulated in Subregion 03 on July 31, 2000 within the CCOS Domain California Air Resources Board/PTSD April, 2005

11 * positive differences are marked with solid lines, negative differences are marked with dashed lines. Contour intervals are 2 ppb ozone. Differences (SAPRC99f - CBIV) Between Maximum Ozone Concentrations (ppb) Simulated in Subregion 06 on August 01, 2000 within the CCOS Domain California Air Resources Board/PTSD April, 2005

12 * positive differences are marked with solid lines, negative differences are marked with dashed lines. Contour intervals are 2 ppb ozone. Differences (SAPRC99f - CBIV) Between Maximum Ozone Concentrations (ppb) Simulated in Subregion 08 on August 02, 2000 within the CCOS Domain California Air Resources Board/PTSD April, 2005

13 Species CCOS Zone Zone Zone Category Domain 03 06 08 CO 7837 2215 1596 384 NO2 174 48 36 13 NO 1689 426 341 132 HONO 35 10 7 3 total NOx 1898 484 384 148 OLE 384 17 53 6 PAR 1667 219 265 74 TOL 113 33 26 5 XYL 132 38 27 6 FORM 35 9 8 2 ALD2 511 29 56 12 ETH 86 19 16 4 MEOH 451 17 57 5 ETOH 62 12 14 4 ISOP 1981 74 253 13 total ROG 5422 467 775 131 ratio ROG/NOx 2.9 1.0 2.0 0.9 Daily Emissions (tons) for Selected Subregions of the 2000 CCOS Domain California Air Resources Board/PTSD April, 2005

14 SYNOPSIS the SAPRC99f chemical mechanism is more sensitive to changes in ROG and NOx emissions than the Carbon Bond IV mechanism. the relative responses of the SARPRC99f and Carbon Bond IV chemical mechanisms to changes in NOx emissions are similar for environments with excess NOx concentrations. California Air Resources Board/PTSD April, 2005

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