EGU24-17504, updated on 11 Mar 2024
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Cloud droplet formation characteristics at eleven locations throughout Greece during summer 2020 and 2021

Kaori Kawana1,2, Romanos Foskinis1,2,3, Eemeli Holopainen1,2, Alexandros Papayannis2,3, Andreas Aktypis1,4, Christos Kaltsonoudis1, David Patoulias1, Angeliki Matrali1,4, Christina Vasilakopoulou1,4, Evangelia Kostenidou10, Kalliopi Florou1, Nikos Kalivitis6, Konstantinos Eleftheriadis7, Constantini Samara8, Mihalis Lazaridis9, Nikolaos Mihalopoulos5,7, Spyros Pandis1,4, Athanasios Nenes1,2, and the Observation Team*
Kaori Kawana et al.
  • 1Center for Studies of Air Quality and Climate Change, Institute of Chemical Engineering Sciences, Foundation for Research and Technology-Hellas, Patras, Greece
  • 2Laboratory of Atmospheric Processes and Their Impacts, School of Architecture, Civil and Environmental Engineering, École Polytechnique Fédérale de Lausanne, Lausanne, Switzerland
  • 3Laser Remote Sensing Unit, Physics Department, National Technical University of Athens, Zografou, Greece
  • 4Department of Chemical Engineering, University of Patras, Patras, Greece
  • 5Institute of Environmental Research and Sustainable Development, National Observatory of Athens, Athens, Greece
  • 6Department of Chemistry, University of Crete, Heraklion, Greece
  • 7Environmental Radioactivity and Aerosol Technology for Atmospheric and Climate Impact Laboratory, NCSR “Demokritos”, Athens, Greece
  • 8Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece
  • 9School of Chemical and Environmental Engineering, Technical University of Crete, Chania, Greece
  • 10Department of Environmental Engineering, Democritus University of Thrace, Xanthi, Greece
  • *A full list of authors appears at the end of the abstract

    Aerosol particles affect the climate system by directly absorbing and scattering solar radiation or by acting as cloud condensation nuclei (CCN) and modulating cloud radiative properties. Cloud particle activation is at the heart of these aerosol-cloud interactions, but it is important to quantify the degree to which aerosol (size distribution and composition) or dynamical aspects (vertical velocity) contribute to cloud droplet number concentration, as they determine in the end the cloud sensitivity to aerosol variations.

    In this study, we use a comprehensive dataset of number-size distributions and meteorological data observed at 11 sites throughout the E. Mediterranean (Greece) during the summers of 2020 and 2021 and use them as input into a state-of-the-art cloud activation parameterization to determine the potential activated cloud droplet number and maximum supersaturation. Remote sensing retrievals of droplet number complement the analysis and are used to evaluate the droplet number calculations carried out with the parameterization. We then examine the droplet formation characteristics of each region (urban, rural, remote, and mountain), determine when clouds are velocity- and aerosol-limited, link them to airmass origin, and discuss the implications for cloud formation in the region.

Observation Team:

Panayiotis Kalkavouras (5), Aikaterini Bougiatioti (5), Stergios Vratolis (7), Maria Gini (7), Athanasios Kouras (8), Sofia-Eirini Chatoutsidou (9)

How to cite: Kawana, K., Foskinis, R., Holopainen, E., Papayannis, A., Aktypis, A., Kaltsonoudis, C., Patoulias, D., Matrali, A., Vasilakopoulou, C., Kostenidou, E., Florou, K., Kalivitis, N., Eleftheriadis, K., Samara, C., Lazaridis, M., Mihalopoulos, N., Pandis, S., and Nenes, A. and the Observation Team: Cloud droplet formation characteristics at eleven locations throughout Greece during summer 2020 and 2021, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-17504,, 2024.