1. How much of the total ozone column change occurs in the stratosphere?

2. Effect of aircraft NOx and H2O on O3 (ppbv). R1-NA. No aircraft aerosols

3. Effect of aircraft NOx and H2O on O3 (%). (R1-NA)/NA. No aircraft aerosols

4. Effect of aircraft aerosols on O3 (ppbv). After simulating 3 years S1-R1

5. Effect of aircraft aerosols on O3 (%). (S1-R1)/R1

6. Effect of removing background aerosols on O3 (ppmv) (S2-R1) No aircraft aerosols Gives more NOx, to increase O3 production below and loss above.

7. Effect of removing background aerosols on O3 (%) (S2-R1)/R1 No aircraft aerosols Gives more NOx, to increase O3 production below and loss above.

8. S1-NA S1-R1R1-NA

10. In percent: The effect on O3 is reduced from ~2% to ~0.6%. This is the effect of aerosols on the ozone, not the reduction in ozone loss! (Max value is ~10 -3 %)