1. March total ozone from GOME/SCIAMACHY –High inter-annual ozone variability during winter/spring NH –Combined effect from ozone transport and polar ozone loss 1997 1996 1999 1998 20012002 2003 2000 2007 2006 2005 2004

2. total ozone and OClO 1996-2007 –Cold Arctic winters with low ozone and high chlorine: 1996, 1997, 2000, (2003), 2005, 2007 –Warm Arctic winters with high ozone and little chlorine activation 1998, 1999, 2001, 2002, 2004, 2006 March total ozone

3. SH October 1995-2006 GOME/SCIAMACHY

4. Antarctic ozone hole “anomaly”10 –SH spring ozone is dominated by polar ozone loss (little variability from year to year –Exception: ozone hole anomaly in 2002 related to the first observed major warmings in SH ozone hole Weber et al., 2003

5. Coupling of chemistry and transport SH NH -weak Brewer-Dobson circulation -high PSC volume -high polar ozone loss -strong Brewer-Dobson circulation -low PSC volume -enhanced ozone transport Update Weber et al., 2003, WMO 2006

6. Coupling of chemistry and transport SH NH Oct‘06 Oct‘02 Mar‘07 Mar‘99 -weak Brewer-Dobson circulation -high PSC volume -high polar ozone loss -strong Brewer-Dobson circulation -low PSC volume -enhanced ozone transport Update Weber et al., 2003, WMO 2006

7. Polar ozone and halogen loading Polar stratospheric halogen load in polar region near its maximum peak (stratospheric air age ~5-6 years) during GOME/SCIA observation period GOME/SCIAMACHY polar observation stratospheric halogen load Newmann et al., 2007

8. Solar activity from SCIAMACHY GOME1 and SCIAMACHY extend satellite observation of UV solar irradiance variations to nearly three decades Minimum of solar cycle 23 in 2007 shows higher activity than SC 21 and 22! SCIAMACHY is the first instrument to daily observe the sun in the visible and near IR spectral region Skupin et al., Mem. Soc. Astronom. Italia, 2005; Adv. Space. Res., 2005 Mg II index: 280 nm

9. Solar activity from SCIAMACHY II First time estimation of spectral variations over a solar cycle in the visible and near IR Contributions from faculae (brightening) and sunspots (darkening) can be quantified! Spectral variations can be applied to climate models for studying the sun-climate interaction in the past and future using appropriate solar proxies Mg II index: 280 nm sunspots faculae