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Abstract:
We model the atmospheric transport and deposition of Beryllium-10 produced by singular solar proton events (SPE) and continuous galactic cosmic rays (GCR), to shed light on the complex interplay of solar activity, atmospheric dynamics and deposition mechanisms.
Our modeling approach, which uses the chemistry-climate model EMAC (ECHAM/MESSy Atmospheric Chemistry), incorporates approximations for the production of Beryllium-10 for both SPE and GCR background concentrations, atmospheric dynamics in the middle atmosphere and troposphere as well as different deposition mechanisms such as dry deposition, wet deposition and sedimentation.
We find good agreement between the simulated Beryllium-10 surface fluxes of the 774/5 AD SPE and four different proxy data sets from ice core analysis. Furthermore, we analyse the global deposition pattern of Beryllium-10 produced by GCR and investigate how multiple factors such as stratospheric dynamics, e.g. the Brewer–Dobson circulation, wind systems like jetstreams, precipitation, sea ice coverage and surface properties correlate with the deposition pattern and the different deposition mechanisms.
