1. r.p.allan@reading.ac.uk © University of Reading 2009 1 Radiative effects of persistent aircraft contrails: a case study Richard Allan Environmental Systems Science Centre Jim Haywood Met Office

2. r.p.allan@reading.ac.uk © University of Reading 2009 2 Courtesy of Jim Haywood Met Office NAME model NOAA17 satellite image 20 March 2009 10:06

3. r.p.allan@reading.ac.uk © University of Reading 2009 3 Courtesy of Jim Haywood

4. r.p.allan@reading.ac.uk © University of Reading 2009 4 Courtesy of Jim Haywood

5. r.p.allan@reading.ac.uk © University of Reading 2009 5 Courtesy of Jim Haywood

6. r.p.allan@reading.ac.uk © University of Reading 2009 6 Courtesy of Jim Haywood

7. r.p.allan@reading.ac.uk © University of Reading 2009 7 Courtesy of Jim Haywood

8. r.p.allan@reading.ac.uk © University of Reading 2009 8 Courtesy of Jim Haywood

9. r.p.allan@reading.ac.uk © University of Reading 2009 9 Using GERB-like/SEVIRI to quantify radiative effects of persistent contrail cirrus

10. r.p.allan@reading.ac.uk © University of Reading 2009 10

11. r.p.allan@reading.ac.uk © University of Reading 2009 11 Additional Activities

12. r.p.allan@reading.ac.uk © University of Reading 2009 12 GERBILS 18-28 June 2007

13. r.p.allan@reading.ac.uk © University of Reading 2009 13 Aircraft field campaign to investigate radiative effect of dust over West Sahara and improve model simulations Lead by Jim Haywood (UK Met Office) Model-GERB

14. r.p.allan@reading.ac.uk © University of Reading 2009 14 Opportunities: Continuous Monitoring of models and observations 13 th March | 14 th March 2006 Model SW albedo 2005 2006 Change in model minus GERB flux differences: relate to change in model physics implementation Identify problem and fix: convective cloud decay time-scale Monitor improvement using GERB/CloudSat 12 3 Allan et al. (2007) QJRMS

15. r.p.allan@reading.ac.uk © University of Reading 2009 15 Allan et al. (2007) QJRMS 2008 Opportunities: linking the cloud feedback and water/energy cycles issues - Radiative/microphysical properties of marine stratiform cloud - CloudSat/CALIPSO, GERB/CERES, SSM/I