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SURFACE SOLAR IRRADIANCE FROM SEVIRI SATELLITE DATA

SURFACE SOLAR IRRADIANCE FROM SEVIRI SATELLITE DATA. Wouter Greuell, Jan Fokke Meirink and Ping Wang Royal Netherlands Meteorological Institute (KNMI). DATA SET. Input: SEVIRI (METEOSAT) cloud mask and cloud properties Spatial resolution: 3 x 3 km 2 at nadir (4 x 7 km 2 for NL)

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SURFACE SOLAR IRRADIANCE FROM SEVIRI SATELLITE DATA

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  1. SURFACE SOLAR IRRADIANCE FROM SEVIRI SATELLITE DATA Wouter Greuell, Jan Fokke Meirink and Ping Wang Royal Netherlands Meteorological Institute (KNMI)

  2. DATA SET • Input: SEVIRI (METEOSAT) cloud mask and cloud properties • Spatial resolution: 3 x 3 km2 at nadir (4 x 7 km2 for NL) • Temporal resolution: 4 images / hour • From 2004

  3. SICCS: SURFACE INSOLATION IN CLOUDYCONDITIONS FROM METEOSAT SEVIRI IMAGERY - ALGORITHM broadband RTM Aerosol properties, Surface elevation for clear pixel Surface Solar Irradiance for broadband Cloud mask Measured radiances at two wavelengths for cloudy pixel Cloud properties broadband RTM narrowbandRTM

  4. SOME REMARKS • Global, direct and diffuse irradiance • Algorithm is physics-based

  5. INPUT • Cloud mask from METEOSAT SEVIRI • Cloud properties (phase, optical thickness and particle size) from METEOSAT SEVIRI • Aerosol optical depth from MACC • Surface albedo derived from MODIS surface albedo • Integrated water vapor from ECMWF

  6. DIRECT IRRADIANCE FOR CLOUDY SKIES • Plane-parallel assumption does not work • Gaps in clouds are crucial • On y-axis ratio of • Measured direct irradiance • by computed clear-sky direct irradiance

  7. VALIDATION WITH BSRN Baseline Surface Radiation Network Lerwick Toravere Cabauw Lindenberg Camborne Payerne Palaiseau Carpentras Sede Boqer Hourly means - 2006

  8. CLEAR SKY DIRECT, MACC INPUT green = spring, blue = summer, red = autumn, black = winter Cabauw, direct Carpentras, direct

  9. CLEAR SKY GLOBAL, MACC INPUT green = spring, blue = summer, red = autumn, black = winter Cabauw, global Carpentras, global

  10. ALL SKY DIRECT green = spring, blue = summer, red = autumn, black = winter Cabauw, direct Carpentras, direct

  11. ALL SKY GLOBAL green = spring, blue = summer, red = autumn, black = winter Cabauw, global Carpentras, global

  12. SNOW ALL SKY Lindenberg, global Toravere, global

  13. MAP NETHERLANDS 2006, global irradiance 1981-2010, precipitation

  14. MAP IBERIAN PENINSULA

  15. CONCLUSIONS Station mean absolute value of the bias: Direct irradiance: 6 W/m2, 4.1% Diffuse irradiance: 5 W/m2, 3.4% Global irradiance: 7 W/m2, 1.9% Strong points: high temporal and spatial resolution based on physics ability to deal with snow albedo background map Weak points: limited to METEOSAT disc coastal regions relief effects not considered Data will be made available for user on the Internet

  16. INTERPOLATION OF ALBEDO • From MODIS MCD43C3 • Temporalresolution: 8 days • Spatialresolution: 0.05 x 0.05 degrees • Combination of linear • interpolationand • meanannualcycle • Includessnow • and ice

  17. green = spring, blue = summer, red = autumn, black = winter Cabauw, direct Carpentras, direct CLEAR SKY DIRECT, AERONET INPUT

  18. CLEAR SKY DIFFUSE, AERONET INPUT green = spring, blue = summer, red = autumn, black = winter Cabauw, diffuse Carpentras, diffuse

  19. CLEAR SKY GLOBAL, AERONET INPUT green = spring, blue = summer, red = autumn, black = winter Cabauw, global Carpentras, global

  20. WATER CLOUDS GLOBAL green = spring, blue = summer, red = autumn, black = winter Cabauw, global Carpentras, global

  21. ALL SKY GLOBAL green = spring, blue = summer, red = autumn, black = winter Cabauw, global Carpentras, global

  22. TABLE BIASES Transmissivities Note: ice cloud transmissivity was corrected by -0.0375

  23. HIGH SOLAR ZENITH ANGLES Cabauw, global Lindenberg, global

  24. DEPENDENCE ON COT, REFF, SZA

  25. 10 YEARS MODIS ALBEDO Visual Near-infrared

  26. COMPARISON IN-SITU DATA Red: coastal stations Blue: other stations

  27. CLEAR DIRECT, MONTHLY AERONET green = spring, blue = summer, red = autumn, black = winter Cabauw, direct Carpentras, direct

  28. CLEAR GLOBAL, MONTHLY AERONET green = spring, blue = summer, red = autumn, black = winter Cabauw, global Carpentras, global

  29. OTHER INPUT H2O, surface albedo, SZA broadband RTM Aerosol properties, Surface elevation for clear pixel Cloud mask Surface Solar Irradiance for broadband Measured radiances at two wavelengths for cloudy pixel Cloud properties H2O, surface albedo, SZA broadband RTM narrowbandRTM

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