QA4EO WP:2220.2 SI-traceable system development

Lunar Irradiance measurements at PMOD/WRC Davos (46.8oN, 9.83oE) The ToA lunar irradiance has been retrieved by interpolating the daytime AOD measurements of the PFR sun photometer. Only ozone has been considered by interpolating the daytime observation from the co-located Brewer double monochromator. The uncertainty of the ToA lunar irradiance based on the interpolation of the atmospheric conditions is estimated by the difference between linear and nearest neighbourhood interpolation results. The quality assurance of the data has been done using the LIME model and the Lunar-PFR when available. The cloud screening has been done using the images of an all-sky camera (excel sheet name: QASUME_Irradiance). Through the comparison to the model and PFR spectral measurements with poor alignment of the optical axis to the moon have been identified. However the relative spectral irradiance (normalized to the spectral window 450 nm to 480 nm) can be used to validated spectral features of lunar irradiance model within a lunar cycle (excel sheet name: QASUME_RelativeIrradiance)