Modeling the Transport and Deposition of ¹⁰ Be Produced by the Strongest Solar Proton Event During the Holocene

Abstract Prominent excursions in the number of cosmogenic nuclides (e.g., 10 Be) around 774 CE/775 document most severe solar proton event (SPE) throughout Holocene. Its manifestation ice cores is valuable for geochronology, but also solar‐terrestrial physics and climate modeling. Using ECHAM/MESSy Atmospheric Chemistry (EMAC) model combination with Warning System Aviation Exposure to SEP (WASAVIES), we investigate transport, mixing, deposition nuclide Be produced by SPE. By comparing results reconstructed time series from four core records, study atmospheric pathways its stratospheric source sink at Earth's surface. The post‐SPE evolution surface fluxes sites well captured model. downward transport atoms controlled Brewer‐Dobson circulation stratosphere cross‐tropopause via tropopause folds or large‐scale sinking. Clear hemispheric differences processes are identified. In both polar regions peak summertime, a larger influence wet on seasonal flux Greenland than Antarctica. Differences following SPE drilling explained specific meteorological conditions depending geographic locations sites.