Support of AMMA and Radagast from CM-SAF

1. Support of AMMA and Radagast from CM-SAF R. Hollmann, J. Schulz Climate Monitoring Satellite Application Facility Deutscher Wetterdienst Offenbach, Germany

2. Short overview of CMSAF and its products Validation summary of surface radiation budget from CMSAF Inter-comparison of CMSAF products for AMMA Conclusion / further work Overview of Talk

3. Motivation: climate monitoring • To assess current climate for infrastructure planning; • To assess climate variability and detect change of mean state and variability; • To support the development of climate models by validating long range/short term climate projections; • To assess climate impacts; • To provide evidence (or not) for policy action (or not).

4. Facts of CMSAF • Climate Monitoring Satellite Application Facility (CMSAF) • Part of EUMETSAT’s ground segment for MSG, 7 further SAF exists with dedicated user groups • CMSAF next phase 2007-2012 ‘Continuous Development and operational phase’ (CDOP) • Major task in CDOP will be the (re-)processing of long-time series of satellite data • Continuation of routine products already available and addition of new improved products

5. Clouds and sfc radiation extended area (available now!) Monthly mean values February 2007 Fractional cloud cover Solar radiation at surface

6. Precipitable Water and Surface Temperature 1 July 2004, 12:00 UTC LPW (850-500 hPa) LPW (<500 hPa) LPW (1000-850 hPa)

7. Retrieval Overview • Retrieval • Vertical integrated water vapour (IWV), total + 3 layers(below 850hPa, 850-500hPa, 500-200hPa) • Surface temperature • Clear-sky only • Data used • SEVIRI IR channels • Radiosondes for static background and determination of covariance • No additional NWP data (stand-alone product) • Method • Optimal estimation technique • Find most likely state vector • Gauss-Newton method (problem is not too non-linear)

8. SEVIRI/AMSR TPW – Comparisons

9. Bias Monitoring • BIAS Monitoring, ocean (Simulation(NCEP-GFS) - Observation) Model change Change of cal. coef. SEVIRI decontamination SEVIRI decontamination Courtesy of M. Stengel, SMHI

10. SEVIRI/AMSR TPW – Comparisons Before bias correction After bias correction

11. Short overview of CMSAF and its products Validation summary of surface radiation budget from CMSAF Results of an inter-comparison of CMSAF products within a GEWEX initiative (RFA) Conclusion / further work Overview of Talk

12. Validation over Ocean -> FS Meteor ‚9-Monthly‘ Mean of SIS 157,1 W/m² FS Meteor 160,7 W/m² Satellite

13. Validation over Ocean -> FS Meteor ‚6-Monthly‘ Mean of SDL 311,7 W/m² FS Meteor 306,1 W/m² Satellite

14. Summary of validation

15. Short overview of CMSAF and its products Validation summary of surface radiation budget from CMSAF Inter-comparison of CMSAF products for AMMA/Radagast Conclusion / further work Overview of Talk

16. Overview of available datasets (I) Area covered: 4.99° S to  30.04° N, 30.07° W to  30.43° E.  Size: 1188 x 1774 pixel for Jan-May 2006; 3636x 3636 pixel for Jun-Dec 2006 (Full disc). Data format: Instantaneous: binary (rad-products), hdf5 (cloud products) Daily/monthly: hdf5

17. Overview of available datasets (II)

18. CMSAF@AMMA First Quicklook of data Example: Cloud fraction 01.01.2006, 12:00 Example: Solar Radiation [W/m²] @ surface 15.02.2006, 13:00

19. RADAGAST/AMMA: 2006 Support of special campaigns Solar incoming radiation vs ARM-data Longwave downwelling radiation Vs ARM-data Jan-March 2006, instantaneous data (bias: sfc-sat) Acknowledgments: Surface radiation data for validation have been kindly provided by the mobile ARM facility.

20. Noise Systematic AMMA-validation: March 2006 Scatter-plot only Data in March Why?

21. Additional measurements in Niamey? Niamey webcam 08.03.06 Slingo et al.. GRL (2006)

22. SEVIRI/ground based – Comparisons (I)

23. SEVIRI/ground based – Comparisons (II)

24. SEVIRI/ground based – Comparisons

25. Short overview of CMSAF and its products Validation summary of surface radiation budget from CMSAF Results of an inter-comparison of CMSAF products within a GEWEX initiative (RFA) Conclusion / further work Overview of Talk

26. Summary • CM-SAF has build a data processing system for water vapour – cloud – radiation products using several polar and geostationary instruments that allows for reprocessing of large data volumes; • Usefulness of near real time integrated products depends largely on the stability of the calibration. Currently, some are only usable for sub-seasonal analysis. • Extra European validation of CMSAF SRB data with AMMA ARM-measurements gives small differences.

27. Summary II • Operational validation of surface radiation budget products show a good agreement with surface observations (MAB SW < 5 W/m², LW < 10 W/m²) • The next CMSAF phase will see integration of long time series for core products based on inter- and recalibrated radiances, e.g. Patmos-X AVHRR and UTH Meteosat exercises;

28. Thank you for your attention To obtain data & more informations: http://www.cmsaf.eu Note: Special AMMA data are available upon request (user help desk)

29. Retrieval of Water Vapour from SEVIRI

30. CM-SAF Product Group – Water Vapour • Water vapour and temperature in the atmosphere from SEVIRI, ATOVS, (IASI), SSM/I • Total and layered column water vapour • Specific and relative humidity as well as temperature profile ATOVS Global, coarse spatial resolution, medium accuracy, profile information (improved by IASI). SSM/I MSG coverage, high spatiotemporal resolution, medium accuracy, coarse profile information. Ocean only, medium spatial resolution, high accuracy, no profile information. SEVIRI