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 transcript:

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

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

Southern California Ozone Study (SCOS) August 5, 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

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

Obs. Sim. Net Gross Pk. Pk Bias Error ppb ppb % % CALGRID/CB CALGRID/S99f 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

Jul 31 Aug 01 Aug 02 UPkR NB UPkR NB UPKR NB ppb % ppb % ppb % CAMx/CB4 Model Zone Zone Zone CAMx/S99f Model Zone Zone Zone 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

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

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

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

* 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

* 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

* 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

Species CCOS Zone Zone Zone Category Domain CO NO NO HONO total NOx OLE PAR TOL XYL FORM ALD ETH MEOH ETOH ISOP total ROG ratio ROG/NOx Daily Emissions (tons) for Selected Subregions of the 2000 CCOS Domain California Air Resources Board/PTSD April, 2005

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