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Surface solar irradiance derived from SEVIRI satellite data

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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 km2 at nadir (4 x 7 km2 for NL)
• Temporal resolution: 4 images / hour
• From 2004
SICCS: SURFACE INSOLATION IN CLOUDY
CONDITIONS FROM METEOSAT SEVIRI IMAGERY -
ALGORITHM
Aerosol
properties,
Surface
elevation
for clear
pixel
broadband
RTM
Surface
Solar
Irradiance
for
broadband
Cloud
mask
for
cloudy
pixel
Measured
radiances
at
two
wavelengths
Cloud
properties
narrowband
RTM
broadband
RTM
SOME REMARKS
• Global, direct and diffuse irradiance
• Algorithm is physics-based
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
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
VALIDATION WITH BSRN
Baseline Surface Radiation Network
Lerwick
Toravere
Cabauw
Camborne
Palaiseau
Lindenberg
Payerne
Carpentras
Sede Boqer
Hourly means - 2006
CLEAR SKY DIRECT, MACC INPUT
green = spring, blue = summer, red = autumn, black = winter
Cabauw, direct
Carpentras, direct
CLEAR SKY GLOBAL, MACC INPUT
green = spring, blue = summer, red = autumn, black = winter
Cabauw, global
Carpentras, global
ALL SKY DIRECT
green = spring, blue = summer, red = autumn, black = winter
Cabauw, direct
Carpentras, direct
ALL SKY GLOBAL
green = spring, blue = summer, red = autumn, black = winter
Cabauw, global
Carpentras, global
SNOW ALL SKY
Lindenberg, global
Toravere, global
MAP NETHERLANDS
2006, global irradiance
1981-2010, precipitation
MAP IBERIAN PENINSULA
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
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
CLEAR SKY DIRECT, AERONET INPUT
green = spring, blue = summer, red = autumn, black = winter
Cabauw, direct
Carpentras, direct
CLEAR SKY DIFFUSE, AERONET INPUT
green = spring, blue = summer, red = autumn, black = winter
Cabauw, diffuse
Carpentras, diffuse
CLEAR SKY GLOBAL, AERONET INPUT
green = spring, blue = summer, red = autumn, black = winter
Cabauw, global
Carpentras, global
WATER CLOUDS GLOBAL
green = spring, blue = summer, red = autumn, black = winter
Cabauw, global
Carpentras, global
ALL SKY GLOBAL
green = spring, blue = summer, red = autumn, black = winter
Cabauw, global
Carpentras, global
TABLE BIASES
Transmissivities
BSRN station
Clear sky
BSRN
Clear sky Water
SEVIRI 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 +0.015
+0.016
Toravere
-0.003
+0.007
+0.017 +0.039 +0.025
+0.020
Note: ice cloud transmissivity was corrected by -0.0375
HIGH SOLAR ZENITH ANGLES
Cabauw, global
Lindenberg, global
DEPENDENCE ON COT, REFF, SZA
10 YEARS MODIS ALBEDO
Visual
Near-infrared
COMPARISON IN-SITU DATA
Red: coastal stations
Blue: other stations
CLEAR DIRECT, MONTHLY AERONET
green = spring, blue = summer, red = autumn, black = winter
Cabauw, direct
Carpentras, direct
CLEAR GLOBAL, MONTHLY AERONET
green = spring, blue = summer, red = autumn, black = winter
Cabauw, global
Carpentras, global
OTHER INPUT
H2O,
surface
albedo,
SZA
Aerosol
properties,
Surface
elevation
for clear
pixel
Cloud
mask
for
cloudy
pixel
broadband
RTM
Measured
radiances
at
two
wavelengths
narrowband
RTM
Cloud
properties
H2O, surface
albedo, SZA
Surface
Solar
Irradiance
for
broadband
broadband
RTM
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