This cumulative thesis presents the results of Schaar et al. (2024, 2025) and Spiegl et al. (2022) in a broader framework plus additional results on cosmogenic beryllium as a proxy for solar and atmospheric dynamics. Schaar et al. (2024) describe in detail the atmospheric transport and deposition of Beryllium-10 from the CE 774/775 SPE and GCR in dependence on the seasonal appearance of the SPE and GCR. Furthermore, the paper discusses the detectability of the CE 774/775 SPE depending on different GCR background conditions, the seasonal timing of the SPE occurrence, the size distribution of aerosols and the respective phase of the 11-year solar cycle during the SPE. In Schaar et al. (2025) the impact of ENSO on near-surface Beryllium-7 is investigated, as ENSO is one of the most important climate phenomena. The results for the different phases of ENSO (La Niña, El Niño and neutral) are compared to data from IMS stations of the CTBTO in the ENSO region and also future projections of ENSO signatures in near-surface Beryllium-7 are shown. Spiegl et al. (2022) has been the starting point for the simulations leading to Schaar et al. (2024).
