Georgia Institute of Technology Sensitivity of Future Year Results to Boundary Conditions Jim Boylan, Talat Odman, Ted Russell February 6, 2001

Georgia Institute of Technology Overview July 1995 Episode with 2040 BWC emissions –Initial and Boundary Conditions reduced by the same ratio that domain-wide emissions were reduced NOx reduced 50% SO2, SO4, and NH4 reduced 63% Comparison of Results –Basecase Results vs BWC Results (original BCs) –2040 BWC with Original BCs vs BWC with Reduced BCs –Spatial and Station Plots Ozone Sulfate, Nitrate, and Ammonium Aerosols Sulfate, Nitrate, and Ammonium Wet Deposition

Georgia Institute of Technology Ozone on July 16, 2040 (1:00 PM)

Georgia Institute of Technology Ozone Change on July 16 (1:00 PM)

Georgia Institute of Technology Ozone on July 16, 2040 (9:00 PM)

Georgia Institute of Technology Ozone Change on July 16 (9:00 PM)

Georgia Institute of Technology Ozone at Great Smoky Mountains

Georgia Institute of Technology Ozone at Shenandoah National Park

Georgia Institute of Technology Ozone at Atlanta

Georgia Institute of Technology Average Sulfate on July 15, 2040

Georgia Institute of Technology Average Sulfate Change on July 15

Georgia Institute of Technology Sulfate at Great Smoky Mountains

Georgia Institute of Technology Sulfate at Shenandoah National Park

Georgia Institute of Technology Average Nitrate on July 15, 2040

Georgia Institute of Technology Average Nitrate Change on July 15

Georgia Institute of Technology Nitrate at Great Smoky Mountains

Georgia Institute of Technology Nitrate at Shenandoah National Park

Georgia Institute of Technology Average Ammonium on July 15, 2040

Georgia Institute of Technology Average Ammonium Change on July 15

Georgia Institute of Technology Ammonium at Great Smoky Mountains

Georgia Institute of Technology Ammonium at Shenandoah National Park

Georgia Institute of Technology Weekly Sulfate Deposition (2040)

Georgia Institute of Technology Weekly Sulfate Deposition Change

Georgia Institute of Technology Weekly Sulfate Deposition Change

Georgia Institute of Technology Weekly Nitrate Deposition (2040)

Georgia Institute of Technology Weekly Nitrate Deposition Change

Georgia Institute of Technology Weekly Nitrate Deposition Change

Georgia Institute of Technology Weekly Ammonium Deposition (2040)

Georgia Institute of Technology Weekly Ammonium Deposition Change

Georgia Institute of Technology Weekly Ammonium Deposition Change

Georgia Institute of Technology Summary of Reducing BCs Ozone –decrease 5 -8 ppb off daily maximum –additional % reduction from basecase Aerosols –Sulfate decrease 2 -3  g/m 3 off daily average additional % reduction from basecase –Nitrate changed by less than 0.5  g/m 3 (+ or -) –Ammonium decrease  g/m 3 off daily average additional % reduction from basecase

Georgia Institute of Technology Summary of Reducing BCs Wet Deposition –Sulfate additional 15% reduction from basecase –Nitrate little change –Ammonium additional % reduction from basecase