1. Impact of Pollutants on the Ozone Layer *ozone observations *the ‘Ozone Hole’ *Heterogeneous chemistry *global ozone depletion Dr Tony Cox ERCA 2004 -Lecture 3

4. From TOMS Satellite data Antarctic Spring From Ground Based UV spectrometer Ozone Column trends FARMAN,ET AL., BRITISH ANTACTIC SURVEY R.STOLARSKI,ET AL., NASA

5. 1987

6. FARMAN,ET AL., BRITISH ANTACTIC SURVEY

10. Descent of air from upper strat. containing HCl & ClONO 2

27. Chlorine Monoxide at 50 hPa ClO

28. Chlorine Nitrate at 50 hPa

32. Future Development of Polar zone Depletion

34. Stratospheric aerosol evolution from backscatter LIDAR measurements at mid-latitudes Aerosol surface Area from sounding