Atmospheric and Deposition Responses of ¹⁰ Be to Volcanic Eruptions Inferred From the Aerosol‐Climate Model ECHAM6.3‐HAM2.3‐SALSA2.0: ¹⁰ Be

Abstract 10 Be deposition in ice cores is widely used for solar reconstructions, but its interpretation is complicated by volcanic influences. Using the state‐of‐the‐art aerosol‐climate model ECHAM6.3‐HAM2.3‐SALSA2.0: 10 Be, we assess the impacts of three major volcanic eruptions: Agung (1963), El Chichón (1982) and Pinatubo (1991). All eruptions enhance stratospheric 10 Be sedimentation, increasing atmospheric 10 Be below the injection altitude for several months, followed by stratospheric 10 Be depletion that takes years to recover. Increases in tropospheric 10 Be and deposition coincide with periods of strong stratosphere–troposphere exchange. Aerosol‐induced sedimentation significantly enhances polar 10 Be deposition subsequent to the Pinatubo and El Chichón eruptions but plays a limited role after the Agung eruption. Sensitivity experiments reveal that higher SO 2 injections generally lead to nonlinear increases in global 10 Be deposition. These results underscore the need to account for volcanic influences when interpreting and modeling polar 10 Be records following major eruptions.