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The Surface Radiation Budget within the Satellite Application Facility on Climate Monitoring

The Surface Radiation Budget within the Satellite Application Facility on Climate Monitoring (CM-SAF) 02.04.2004 Rainer Hollmann 2 with Annegret Gratzki 2 Richard Müller 2 , Carlos Geijo-Guerrero 3 , Alex Kryvobok 4 2 Deutscher Wetterdienst, 3 INM, Madrid, Spain 4 UMHI, Kiev.

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The Surface Radiation Budget within the Satellite Application Facility on Climate Monitoring

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  1. The Surface Radiation Budget within the Satellite Application Facility on Climate Monitoring (CM-SAF) 02.04.2004 Rainer Hollmann2 with Annegret Gratzki2 Richard Müller2, Carlos Geijo-Guerrero3, Alex Kryvobok4 2Deutscher Wetterdienst, 3INM, Madrid, Spain 4UMHI, Kiev GIST 21st, Boulder

  2. The Surface Radiation Budget within the CM-SAF Overview of Talk • Satellite Application Facility on Climate Monitoring • Surface Shortwave Radiation • general approach • initial validation results • first pre-operational images • Surface Longwave Radiation • general approach • initial validation results • first pre-operational images • Conclusions GIST 21st, Boulder

  3. SAF - Structure and Hosts Finland - FMI -Ozone Monitoring Germany - DWD -Climate Monitoring France - MF -Ocean and Sea Ice Portugal - IM -Land Surface Analysis E U M E T S A T Denmark - DMI -GRAS Spain - INM -Support to Now-casting and Very Short Range Forecasting United Kingdom - UKMO -Numerical WeatherPrediction GIST 21st, Boulder

  4. CM-SAF: The Partners GIST 21st, Boulder

  5. CM-SAF: objectives and characteristics • support climate monitoring at regional scale • provide climate data sets • provide validation data • Operational environment • Long term with reprocessing capability • Quality Assurance + Control • provision of validated • homogeneous and • consistent data sets GIST 21st, Boulder

  6. > 2007 > 2004 > 20?? > 2007 CM-SAF: The Area under investigation… • BL-Area: Europe and part of North Atlantic Ocean (60° W – 60° E, 30° N – 80° N) GIST 21st, Boulder

  7. AVHRR+MSG / FD AVHRR+MSG / BL AVHRR BL 9 7 8 2000 2010 1 2 3 4 5 6 CM-SAF: The Schedule MSG_1 (27.08.2002) METOP_1 O p e r a t i o n s ENVISAGED incl. R&D B r i d g i n g P h a s e IOP incl. R&D DEVELOPMENT PHASE GIST 21st, Boulder

  8. The Surface Radiation Budget within the CM-SAF • Satellite Application Facility on Climate Monitoring • Surface Shortwave Radiation • general approach • initial validation results • first pre-operational images • Surface Longwave Radiation • general approach • initial validation results • first pre-operational images • Conclusions GIST 21st, Boulder

  9. Cloudproducts Per pixel Albedo Per pixel Gridding merging Background Surface Radiation Budget Per pixel LUT Endproducts NWP-model data Surface Radiation Budget: Schematic overview of processing MSG (SEVIRI GERB) NOAA-AVHRR/EPS GIST 21st, Boulder

  10. Cloud top height March 2004 • Full area has been split up into ~ 30 tiles for cloud processing • 1 x 1 km² spatial resolution • instantaneous data of an overpass 06.03.2004 02:48 GIST 21st, Boulder

  11. Monthly mean cloud cover Feb. 2004 • Full area, 15 km x 15 km spatial resolution GIST 21st, Boulder

  12. Solar Surface Radiation: General approach/Layout prototype Satellite Data GME analyses Background data & maps int. water vapour asfc, atoa e.g. spec. albedo maps, surface type Model runs of SHDOM for N atmosph. conditions Lookuptable for SIS = f (t, sza, a_sfc, a_toa,T) Improvement monthly means, Daily means, mean diurnal cycle Surface Obs. Inst. SIS Validation User GIST 21st, Boulder

  13. Surface Shortwave Radiation (SIS): Validation Two initial validation exercises: • Take GERB-like METEOSAT-7 fluxes as input + ECMWF model water vapour • => case study for Cabauw 21-23.09.2001 • Take ISCCP-DX data (cloud data + Lvis) + NTB + ECMWF water vapour • 5 months for validation with surface meas. • Comparison with GEWEX-SRB for August 1995 GIST 21st, Boulder

  14. Surface Shortwave Radiation: Validation (I) Surface shortwave radiation for 22. - 24. September 2001 *: METEOSAT derived fluxes : Measurements in Cabauw (NL) : Cloudcover in % (given by satellite) Shortwave surface flux in W/m² 100 % 0 % Time in hours after 22. September 0:00 UTC GIST 21st, Boulder

  15. Surface Shortwave Radiation: Validation (II) Payern, Switzerland Satellite / W/m² In-situ / W/m² GIST 21st, Boulder

  16. Surface Shortwave Radiation: Validation (II) Arkona, Germany Satellite / W/m² In-situ / W/m² GIST 21st, Boulder

  17. Surface Shortwave Radiation: Validation (II) Validation results of monthly means SIS, Based on ISCCP-DX/ECMWF input data NSTAT: Number of available validation stations, MA_ME: Measured monthly average, SI_ME: standard deviation of measured data, MA_CA.: Calculated monthly average, SI_CA: standard deviation of calculated data, BIAS calculated - measured in W/m² and % of measured average. GIST 21st, Boulder

  18. Surface Shortwave Radiation Comparison of SIS monthly mean with SRB-GEWEX (Aug. 1995) CM-SAF SIS in W/m² SRB-GEWEX SIS in W/m² (SW) GIST 21st, Boulder

  19. SIS (GEWEX) in W/m² SIS (CM-SAF) in W/m² Surface Shortwave Radiation Comparison of SIS monthly mean with SRB-GEWEX (Aug. 1995) Monthly mean, regional comparison 1° x 1° lat-lon Y = 0.8799120291 * X + 16.22678981 Mean bias: 13 W/m² R-squared = 0.82 GIST 21st, Boulder

  20. Monthly mean if 20 daily means are present Daily mean if 3 daylight overpasses First results from February 2004: downwelling Shortwave GIST 21st, Boulder

  21. First results from February 2004: Surface albedo monthly mean GIST 21st, Boulder

  22. The Surface Radiation Budget within the CM-SAF • Satellite Application Facility on Climate Monitoring • Surface Shortwave Radiation • general approach • initial validation results • first pre-operational images • Surface Longwave Radiation • general approach • initial validation results • first pre-operational images • Conclusions GIST 21st, Boulder

  23. The surface Radiation Budget within the CM-SAF: Longwave Radiation The Gupta Parameterisation Clear sky parameterisation Cloud-parameterisation GIST 21st, Boulder

  24. Surface Longwave Radiation (SDL): Validation Two initial validation exercises: • Take radiosoundings for different BSRN stations, run Gupta with that and compare against surface measurements & RTM caculations (Fu-Liou) • case study for Lindenberg August 1995 • Take ISCCP-DX cloud data + ECMWF profiles of water vapour and temperature • 5 months for validation with surface meas. • Comparison with GEWEX-SRB for August 1995 GIST 21st, Boulder

  25. Investigations of SDL-Biases What is the effect of the improvements? 1995 1997 GIST 21st, Boulder

  26. Surface Longwave Radiation: Validation (II) Monthly mean of downwelling longwave radiation for August 1995 in W/m² GIST 21st, Boulder

  27. Surface Longwave Radiation: Validation (II) 1° x 1° lat – lon boxes Y=0.9659531439 * X + 6.998371831 mean CM-SAF DLF: 343.78 W/m² mean SRB GEWEX DLF: 339.07 W/m ² R=0.94 GIST 21st, Boulder

  28. Monthly average First results from February 2004: downwelling Longwave GIST 21st, Boulder

  29. The Surface Radiation Budget within the CM-SAF • Satellite Application Facility on Climate Monitoring • Surface Shortwave Radiation • general approach • initial validation results • first pre-operational images • Surface Longwave Radiation • general approach • initial validation results • first pre-operational images • Conclusions GIST 21st, Boulder

  30. The Surface Radiation Budget within the CM-SAF Conclusion, future plans and activities • Satellite Application Facility on Climate Monitoring has started the pre-operational processing of NOAA-AVHRR overpasses • Surface Radiation Processing • improve aerosol information • monitoring of pre-operational products • test runs for GERB/SEVIRI (April 04) • test runs with CERES input (~summer 04) • Ongoing validation • target months Oct. 2002, June 2003, Feb. 2004 • building a matchup-database for validation GIST 21st, Boulder

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