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UP: Fachverband Umweltphysik
UP 6: Upper Atmosphere, Polar Chemistry and Volcanic Aerosols
UP 6.4: Vortrag
Mittwoch, 11. März 2026, 10:15–10:30, MER/0002
Stratospheric aerosol size evolution after the Ruang volcanic eruptions in 2024 — •Felix Wrana, Christian von Savigny, and Sandra Wallis — Institute of Physics, University of Greifswald, Greifswald, Germany
The size of stratospheric aerosols is an important factor in their effect on Earth’s radiative balance and on atmospheric chemistry. On April 17th and 30th 2024, the Ruang volcano (2.3 ∘N, 125.37 ∘E) had two eruptions with a volcanic explosivity index (VEI) of 4, both reaching the stratosphere. Although each eruption injected only around 0.26 Tg of SO2, they had a considerable effect on the stratospheric aerosol size in the Junge layer, that was at that point in time still affected by the exceptional Hunga eruption of 2022. The evolution of the stratospheric aerosol size from before to after the Ruang eruptions is shown, based on a multi-wavelength retrieval from the satellite solar occultation measurements of the Stratospheric Aerosol and Gas Experiment III on the ISS (SAGE III/ISS). Similarities and differences with other volcanic eruptions that reached the stratosphere in the previous years are shown and discussed, adding to our current understanding of the main driving factors behind observed aerosol size increases vs decreases after volcanic eruptions. Also, the satellite retrieval is validated with balloon-borne in situ measurements.
Keywords: stratospheric aerosol; volcanic eruption; aerosol size; satellite retrieval