1. WOAP 4 meeting, Hamburg, 29 – 31 March 2010 Perspectives from WCRP projects SPARC: Objectives of the next two years Christian von Savigny (IUP Bremen) on behalf of SPARC

2. WOAP 4 meeting, Hamburg, 29 – 31 March 2010 Overview of science objectives up to 2013 Chemistry and Climate Detection, attribution and prediction of stratospheric changes Stratosphere-troposphere dynamical coupling

3. WOAP 4 meeting, Hamburg, 29 – 31 March 2010 I. Chemistry and Climate Quantification of the evolution of stratospheric ozone and its interaction with climate SPARC Science objectives up to 2013 Adapted from Steinbrecht et al., IJRS [2009]

4. WOAP 4 meeting, Hamburg, 29 – 31 March 2010 The SPARC Chemistry Climate Model Validation Activity (CCMVal), providing modeling support for AC&C and the WMO/UNEP Ozone Assessment process mandated under the Montreal Protocol Ongoing SPARC contributions to the IPCC Assessment process, e.g. provision of comprehensive ozone data sets and projections for use in climate predictions SPARC Initiative on Halogen Chemistry: clarification of recent laboratory results concerning the role of chlorine dimer photolysis in ozone depletion I. Chemistry and Climate Quantification of the evolution of stratospheric ozone and its interaction with climate change SPARC, in association with IGAC leads the WCRP-IGBP cross- cutting activity on atmospheric chemistry and climate (AC&C) SPARC Science objectives up to 2013

5. WOAP 4 meeting, Hamburg, 29 – 31 March 2010 Example: SPARC Initiative on Halogen Chemistry Uncertainty in ClO-dimer photolysis rates SPARC Newsletter #32, Figures adapted from Burkholder and Pope et al. [2007] ClOOCl absorption X-sections SPARC Newsletter #32

6. WOAP 4 meeting, Hamburg, 29 – 31 March 2010 II. Detection, attribution and prediction of stratospheric changes Quantification of stratospheric temperature changes SPARC Science objectives up to 2013 Randel et al., An update of observed stratospheric temperature trends [2009]

7. WOAP 4 meeting, Hamburg, 29 – 31 March 2010 II. Detection, attribution and prediction of stratospheric changes Quantification of stratospheric ozone and temperature changes WAVAS-2 (WAter Vapour ASsessment) provides an update of the Assessment of Upper Tropospheric and Stratospheric Water Vapour Report (SPARC report #2) published in 2000 SPARC Science objectives up to 2013 Documentation of the state of the polar vortices during the IPY period (maintenance of SPARC-IPY data archive) Improve understanding of natural variability of key stratospheric variables in order to detect and attribute stratospheric long-term change SOLARIS (SOLar Influence study for SPARC): Improvment of understanding of solar influences on climate

8. WOAP 4 meeting, Hamburg, 29 – 31 March 2010 Jackman et al., ACP [2008] II a) Improvement of understanding of solar influences on climate Impact of solar 11-year and 27-day cycles Impact on dynamics poorly understood Effect of intermittent events, e.g. solar proton events (SPEs)

9. WOAP 4 meeting, Hamburg, 29 – 31 March 2010 III. Stratosphere-troposphere dynamical coupling SPARC Dynvar (Dynamics and Variability) activity: evaluation of the ability of GCMs to represent large scale dynamical coupling between the stratosphere and the troposphere and assess its importance for climate prediction SPARC Data Assimilation Working Group: Assessment of model biases using data assimilation SPARC Science objectives up to 2013

10. WOAP 4 meeting, Hamburg, 29 – 31 March 2010 SPARC Science objectives up to 2013 The SPARC data initiative Presentation by Susann Tegtmeier

11. WOAP 4 meeting, Hamburg, 29 – 31 March 2010 Main goal: Improve quality of Limb sensor data products for the continuation of the occultation satellite data record (HALOE, SAGE II/III, POAM III) of stratospheric constituents and aerosols Sensors include limb-emission (e.g., MLS/Aura, SABER/TIMED, MIPAS/Envisat), and limb-scatter instruments (SCIAMACHY/Envisat, OSIRIS/Odin) providing observations up to about 2013/2014 Limb observations from space allow profile retrievals with high vertical resolution and near-global coverage on a daily basis, i.e. better coverage than occultation instruments Data products have improved significantly in recent years and new data products were/are developed The SPARC limb working group SPARC Science objectives up to 2013