Radon flux estimates for central Europe 2021

This dataset contains two process-based (prior) radon (222Rn) flux maps and six inversion-based (posterior) 222Rn flux estimates for central Europe in 2021. The process-based flux maps are created using the 222Rn flux model from Karstens et al. (2015) and high-resolution (1 km x 1 km) soil moisture data from the German Weather Service (DWD) for Germany, as well as coarser-resolution (0.25° x 0.25°) GLDAS-Noah soil moisture data for the rest of Europe. The two process-based maps differ in how the soil moisture data has been averaged vertically over the soil column (0-10 cm vs. 0-40 cm). The flux maps have a daily resolution and have been re-gridded to a horizontal resolution of 0.05° x 0.05°. The posterior 222Rn flux estimates are the results of a one-year 222Rn inversion performed using the CarboScope-Regional (CSR) inversion system. Hourly 222Rn observations from 17 atmospheric sites in central Europe have been used to constrain the prior fluxes. The robustness of the inversion flux results has been investigated using different prior fluxes and transport models. The prior fluxes are based on the 222Rn flux model from Karstens et al. (2015), and different soil moisture products (all of these are averaged over the top 0-40 cm of the soil column): GLDAS-Noah (222Rn map from Karstens and Levin et al., 2022a; available at: https://hdl.handle.net/11676/JoDR653JxQuqLvEwzqI2kdMw), ERA5-Land (222Rn map from Karstens and Levin et al., 2022b; available at: https://hdl.handle.net/11676/NvC7D-BVXlnHtFBdUSKpNVHT), DWD/GLDAS (222Rn map available in this dataset). Furthermore, a spatially and temporally uniform (flat) prior has been used. The different transport models are STILT, FLEXPART and NAME. Please note that the posterior 222Rn flux maps are only reliable within central Europe, which is well covered by atmospheric 222Rn observations (see Maier et al., 2025). This dataset belongs to the publication of Maier et al., 2025, where further details can be found: Maier, F., Falge, E., Gachkivskyi, M., Henne, S., Karstens, U., Kikaj, D., Levin, I., Manning, A., Rödenbeck, C., and Gerbig, C.: How reliable are process-based 222radon emission maps? Results from an atmospheric 222radon inversion in Europe, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2025-477, 2025.