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

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Presentation on theme: "SURFACE SOLAR IRRADIANCE FROM SEVIRI SATELLITE DATA Wouter Greuell, Jan Fokke Meirink and Ping Wang Royal Netherlands Meteorological Institute (KNMI)"— Presentation transcript:

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 km 2 at nadir (4 x 7 km 2 for NL) Temporal resolution: 4 images / hour From 2004

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

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 Cabauw Toravere Payerne Carpentras Sede Boqer Palaiseau Camborne Lerwick Lindenberg 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, globalToravere, 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/m 2, 4.1% Diffuse irradiance: 5 W/m 2, 3.4% Global irradiance: 7 W/m 2, 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

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18 INTERPOLATION OF ALBEDO From MODIS MCD43C3 Temporal resolution: 8 days Spatial resolution: 0.05 x 0.05 degrees Combination of linear interpolation and mean annual cycle Includes snow and ice

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

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

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

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

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

24 TABLE BIASES BSRN station Clear sky BSRN Clear sky SEVIRI Water clouds Ice clouds All clouds All skies 6 stations-0.001+0.013+0.009-0.003+0.004+0.006 Lerwick-0.027+0.021+0.020+0.015 +0.016 Toravere-0.003+0.007+0.017+0.039+0.025+0.020 Note: ice cloud transmissivity was corrected by -0.0375 Transmissivities

25 HIGH SOLAR ZENITH ANGLES Cabauw, globalLindenberg, global

26 DEPENDENCE ON COT, REFF, SZA

27 10 YEARS MODIS ALBEDO VisualNear-infrared

28 COMPARISON IN-SITU DATA Red: coastal stations Blue: other stations

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

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

32 OTHER INPUT Measured radiances at two wavelengths Cloud properties Surface Solar Irradiance for broadband narrowband RTM broadband RTM Cloud mask for clear pixel for cloudy pixel Aerosol properties, Surface elevation broadband RTM H 2 O, surface albedo, SZA H 2 O, surface albedo, SZA


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