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Radiance/irradiance studies (WP11). 11.1 : validation of solar irradiance – done, by Juan Acarreta 11.2 : degradation monitoring – tools developed 11.3 : compare reflectance with a radiative transfer code ( < 400 nm) 11.4 : compare reflectance with MERIS – done, by Juan Acarreta
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Radiance/irradiance studies (WP11) 11.1 : validation of solar irradiance – done, by Juan Acarreta 11.2 : degradation monitoring – tools developed 11.3 : compare reflectance with a radiative transfer code ( < 400 nm) 11.4 : compare reflectance with MERIS – done, by Juan Acarreta 11.5 : validation for ‘simple’ scenes – compared with GOME instead WP 11.3 – Reflectance comparison with DAK: geometry ground albedo ozone (GOME) no clouds Rdak Rscia,according to dak Polarisation Sensitivity SCIAMACHY
Cloud-free Sahara scene, east / west pixel Reflectance comparison in the UV (300–400 nm): BLUE = SCIAMACHY (no polarisation correction) GREEN = DAK RED = DAK (SCIA polarisation sensitivity included)
Relative difference SCIAMACHY – DAK GREEN = difference SCIA–DAK (partly caused by polarisation sensitivity) RED = difference SCIA–DAK (no polarisation effect) = ‘REAL’ error in SCIA reflectance
Typical fit R(MERIS) vs. R(SCIA) at 665 nm mu=1.00 ... mu=0.87
