VolCloud will treat 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 are the qualititative and quantitative investigation of the following effects:

• Impact of volcanic cloud condensation nuclei (CCN) perturbations on liquid cloud adjustments
• Cloud adjustments to temperature- and humidity perturbations after volcanic eruptions
• Impact of volcanic CCN and ice nucleating particle (INP) perturbations on ice- and mixed-phase clouds
• Impact of volcanic eruptions on deep convective clouds and on cross-tropopause transport

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)

Gryspeerdt, E., Quaas, J., Ferrachat, S., Gettelman, A., Ghan, S., Lohmann, U., Morrison, H., Neubauer, D., Partridge, D. G., Stier, P., Takemura, T., Wang, H., Wang, H., and Zhang, K.: Constraining the instantaneous aerosol influence on cloud albedo, Proc. Nat. Acad. Sci. USA, 119, 4899-4904, /doi.org/10.1073/pnas.1617765114, 2017.

Hoose, C., and Möhler, O.: Heterogeneous ice nucleation on atmospheric aerosols: A review of results from laboratory experiments, Atmos. Chem. Phys., 12, 9817 – 9854, /doi.org/10.5194/acp-12-9817-2012, 2012.

Sourdeval, O., Gryspeerdt, E., Krämer, M., Goren, T., Delanoë, J., Afchine, A., Hemmer, F., and Quaas, J.: Ice crystal number concentration estimates from lidar–radar satellite remote sensing – Part 1: Method and evaluation, Atmos. Chem. Phys., 18, 14327-14350, /doi.org/10.5194/acp-18-14327-2018, 2018.

Steinke, I., Möhler, O., Kiselev, A., Niemand, M., Saathoff, H., Schnaiter, M., Skrotzki, J., Hoose, C., and Leisner, T.: Ice nucleation properties of fine ash particles from the Eyjafjallaj.kull eruption in April 2010, Atmos. Chem. Phys., 11, 12945-12958, /doi.org/10.5194/acp-11-12945-2011, 2011.