Karolina Siegel, PhD student, MISU


Kappa-Köhler prediction of CCN activity during the Arctic Ocean 2018 expedition


Aerosol-cloud interactions belong to mechanisms in the Earth's climate system with the highest uncertainty according to the Intergovernmental Panel on Climate Change (IPCC). This is especially true in the central Arctic, which is one of the most unexplored regions on the planet. Due to the low number of observations, the climate models struggle to represent the Arctic climate system and explain why climate change is several times more rapid here compared to lower latitudes. Previous studies (e.g. Intrieri et al., 2002, Tjernström et al., 2004) have shown that clouds play an important role, and changes in aerosol emissions and cloud properties are presumed to contribute with climate feedbacks.

This seminar will present our study that aims at increasing the knowledge of Arctic aerosols and their role in cloud formation. We use results of the molecular composition of organic aerosols (Siegel et al., 2021) collected in the central Arctic Ocean during the MOCCHA campaign in the summer of 2018 along with Kappa-Köhler theory and field/laboratory measurements with a Cloud Condensation Nuclei Counter (CCNC) for this purpose. To what extent does this more in-depth knowledge matter for the prediction of the cloud condensation nuclei (CCN) ability?


Thursday May 20, 14:15


Remotely via Zoom - link will be distributed via MISU's seminar email announcement.