Updates on the CAMS Radiation Service v4.6: Validation of the Himawari field of view

Kurzfassung

As a part of the Copernicus Atmosphere Monitoring Service (CAMS), the CAMS Radiation Service (CRS) provides open-data historical irradiance estimates at ground level retrieved from satellite images. In the latest version of the CRS (v4.6), the Himawari geostationary satellite was added to the operational chain of the CRS. The Himawari sub-satellite point is located at a longitude of 140.7E and has a Field Of View (FOV) of ±78.3°, which extends CRS from 62.4E to 141W. The images from the Himawari geostationary satellite are used along with the atmospheric conditions retrieved from the CAMS Reanalysis on the Heliosat4 method to produce estimates of irradiance at ground level (Schroedter-Homscheidt et al., 2022). These irradiance estimates are operationally available in the CRS from the year 2016 until two days before the current date. In this work, we show the validation of the new added Himawari FOV to the CRS for various seasons and the most recent algorithm updates. In order to assess the quality of the irradiance estimates of the newly added domain, we will present a detailed comparison of the error metrics found on the Himawari FOV with those of the long standing FOV of the the Meteosat Second generation (MSG).