New particle formation (NPF) processes affect the cloud condensation nuclei (CCN) formation globally, which in turn cools the climate through cloud formation processes. It is estimated that more than half of the global CCN are formed via NPF processes and accurate representation of NPF processes in climate models is therefore important for predicting future climate change. Recent advances suggest that iodine oxoacid particle formation may stand for global importance which is yet not included in models. We plan to investigate this hypothesis through a combination of laboratory experiments and global simulations. Experiments will be carried out using the CLOUD chamber at CERN to derive particle formation and growth rates under various conditions. These data will further be parameterized to feed into global models to simulate iodine particle formation processes and to study their role in cloud condensation nuclei formation and radiative forcing.

2022

2025