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Prof. Christian von Savigny (Uni Greifswald) New results from the joint research project VolImpact

Prof. Christian von Savigny (Uni Greifswald) will deliver a talk on the topic "New results from the joint research project VolImpact".


This presentation will present some recent results from the DFG Research Unit VolImpact (FOR 2820) that deals with volcanic effects on the atmosphere and climate. A particular focus will be on the atmospheric effects of the Hunga-Tonga Hunga-Ha'apai (HTHH) eruption that occurred in January 2022 and that was quite unusual in different respects. The overshooting top of its plume reached the lower mesosphere (about 56 km) and it injected about 150 Mt of H2O into the middle atmosphere, corresponding to about 15% of the stratosphere's H2O load. In a recent study we tracked the HTHH H2O plume through the stratosphere and showed that its temporal evolution can be well reproduced with model simulations. A current focus is on the further evolution of the H2O plume in the mesosphere. The HTHH H2O anomaly reached the polar summer mesopause in the southern hemisphere in January 2004. At the end, the results of a new study will be summarized that provide an explanation for the occurrence of highly unusual green sunsets after the eruption of Krakatoa in August 1883.