(1) Seasonality of Heatwaves: Insights from Dynamical Systems Theory and Weather Regimes (2) Serial clustering of multiple impact-related hazards in Germany: When, to what extent and why? (3) The impact of volcanic eruptions on cloud properties: A case study of the Raikoke eruption 2019 (4) From fine to giant: Multi-instrument assessment of the particle size distribution of emitted dust during the J-WADI field campaign