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The global Dx dataset of the International Satellite Cloud Climatology Project (ISCCP) with a spatial resolution of about 30×30 km² was analysed to produce spatially highly resolved long-timedatasets to describe the radiation budget for Central Europe over the periodof 1984–2000. The computation of shortwave and longwave radiant fluxdensities at top of atmosphere and at surface was based on 1D radiativetransfer simulations. The simulations were carried out for all relevantatmospheric and surface conditions and the results were inserted into alook-up table. Thus, long-time calculations for all conditions and timeslices of the Dx dataset could be realised. The study is focussed on theglobal radiation at surface. The first examination was carried out for the ISCCP D1 and the ISCCP D2dataset. These datasets, including cloud and surface information on adifferent spatial scale (280×280 km2), were applied to the producedlook-up table analogue to the Dx data. The calculated global radiation ofthe D1 and D2 dataset were compared to the Dx dataset. The differencesbetween these datasets mainly range from 5–15 Wm−2 (2–6%)with regional peaks up to 25 Wm−2 (10%). The evaluation with the GEWEX Surface Radiation Budget (SRB)data emphasises differences between 5–25 Wm−2 (6–16%) over land areas. Deviations to an ISCCPprovided flux data set vary from 0 Wm−2 in the North up to 35 Wm−2(0–13%) in the South of Central Europe. The global radiation datasets provided by the Global Energy Balance Archive (GEBA) and the German Meteorological Service (DWD) agreewell, but they are 5–25 Wm−2 (7–10%) lower than the Dxresults. Annual analyses of global radiation of various regional climate modelscomplete the study. It is figured out that the used models and methodsreveal a couple of discrepancies. Especially in wintertime the results ofour analysis differ to the considered models. Principally the uncertaintieswere caused by the determined range of values and simplifications for thecomputation of the radiative transfer simulation

Long-time global radiation for Central Europe derived from ISCCP Dx data