VolCloud investigates the cloud response to volcanic eruptions due to aerosol-cloud interactions and cloud adjustments making use of a range of ICON simulations as well as of satellite data. Specific objectives in phase II build on the work and results of phase I and are the qualititative and quantitative investigation of the following effects:

• Impact of volcanic cloud condensation nuclei (CCN) perturbations on liquid cloud adjustments, specifically the response of boundary-layer dynamics
• Cloud adjustments to temperature- and humidity perturbations after volcanic eruptions
• Impact of volcanic CCN and ice nucleating particle (INP) perturbations on mixed-phase clouds and cirrus
• Impact of volcanic aerosol on dynamical lofting of the plume and subsequently stratospheric water vapour

Johannes Quaas (PI, University of Leipzig), Corinna Hoose (Co-I, Karlsruhe Institute of Technology), Mahnoosh Haghighatnasab (Ph.D. student, University of Leipzig), Fatemeh Zarei (Ph.D. student, Karlsruhe Institute of Technology), Charlotte Lange (Ph.D. student, University of Leipzig).

Haghighatnasab, M., J. Kretzschmar, K. Block, and J. Quaas, Impact of Holuhraun volcano aerosols on clouds in cloud-system resolving simulations, Atmos. Chem. Phys., 2, 8457-8472, doi.org/10.5194/acp-22-8457-2022, 2022.