The Impact of ENSO on near-surface Beryllium-7

Schaar, K.*; Spiegl, T.*; 佐藤 達彦   ; Langematz, U.*

Schaar, K.*; Spiegl, T.*; Sato, Tatsuhiko; Langematz, U.*

The concentration of near-surface Beryllium-7 contains valuable information about the atmosphere, e.g., the tropospheric circulation, precipitation pattern or specific atmospheric phenomena, like the El Nino southern oscillation. Here, we modelled the transport and deposition of Beryllium-7 from galactic cosmic rays for 1850-2100, using the ECHAM/MESSy Atmospheric Chemistry climate model, and analyzed the variability of near-surface Beryllium-7 due to the El Nino southern oscillation. We find that our simulated Beryllium-7 time series agree well with Beryllium-7 measurements from the international monitoring system of the Comprehensive Nuclear-Test-Ban Treaty Organization.