1. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 The Annual Cycle of Surface Radiation Budget over Europe Pamela E. Mlynczak Science Systems and Applications, Inc., Hampton, VA G. Louis Smith National Institute of Aerospace, Hampton, VA Rainer Hollmann Deutscher Wetterdienst, Offenbach, Germany

2. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 Objective To study geographical patterns of and describe the annual cycle of surface radiation budget parameters over Europe using a high-resolution dataset.

3. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 Data Set Supplied by the Satellite Application Facility for Climate Monitoring (CM-SAF) 15 km 2 resolution Area covered – 30°N - 80°N, 60°W - 60°E Monthly means for 2006 Surface radiation flux components: Upward, Downward and Net LW Downward and Net SW Net Total Based on data from Meteosat 8 Full disk coverage with Meteosat 9 since May 2007

4. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 Annual Mean of SW Down Flux

5. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 Annual Mean of LW Up Flux

6. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 Annual Mean of LW Down Flux

7. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 Annual Mean of LW Net Flux

8. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 Principal Component/ Empirical Orthogonal Function Analysis y(x,t) = y mean (x) + annual cycle y(x,t) = y mean (x) +  PC i (t) x EOF i (x) PC is the time history. EOF is the map.

9. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 Average RMS and Variances QuantityRMSEOF-1EOF-2 SW Down52.00.9620.013 SW Net41.70.9540.017 LW Up32.20.9600.021 LW Down24.00.9150.041 LW Net10.00.7970.075 Total Net33.90.9630.013

10. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 Principal Components for SW Down

11. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 SW Down EOF-1

12. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 Principal Components for LW Up

13. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 LW Up EOF-1

14. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 LW Up EOF-1 over Spain

15. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 Principal Components for LW Down

16. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 LW Down EOF-1

17. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 Principal Components for Total Net

18. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 Total Net EOF-1

19. 20 th Conference on Climate Variability and Change New Orleans, LA -- January 22, 2008 Conclusion The CM-SAF SRB dataset is very useful for weather/climate studies over the European sector at 15 km 2 resolution. The annual mean SW and LW maps show strong longitudinal variations due primarily to cloud forcing. The annual variations for SW and LW are concentrated strongly in the annual cycles, with very small effects in the semiannual and higher terms. More than 90% of the variances are explained by PC-1. The annual cycles of SW and LW have strong longitudinal variations due primarily to cloud forcing.