Atmospheric aerosol-cloud-climate interactions (e.g. particle oxidation and photosensitization, secondary aerosol and biogenic particle formation, molecular composition-, phase-, acidity- and structure- changes, heterogeneous ice nucleation ...) are fundamental processes in the atmosphere. Despite the importance of these processes in energy transfer, cloud dynamics, precipitation formation, and hence in climate change, little is known about the molecular mechanism and the respective contribution of different structural and chemical surface properties of the atmospheric aerosols and ice nuclei controlling these processes in the atmosphere. For example, observation of atmospheric ice nucleation has bridged the scales from macroscopic to microscopic levels (satellites, balloons, mountain stations, flight campaigns, and laboratory measurements) and has delivered a wide variety of important results in cloud microphysics, particularly concerning the ice nucleation ability of atmospheric aerosol particles. However, fundamental understanding of the cloud dynamics and properties, which play the major role in the climate system, will require the understanding of water-aerosol Surface Interactions.

To advance our knowledge about atmospheric processes, this session aims to bring together experimental and theoretical approaches concerned with investigating water- and ice-solid interactions as well as ice nucleation processes on the molecular level. The goal is to fill the gap between the cloud and atmospheric properties and the aerosol-water surface interactions. We aim to gather contributions from laboratory and theoretical investigations that deal with the interaction of water and ice with atmospheric relevant mineral and biological surfaces.

- Invited speaker: Prof. Dr. Mischa Bonn, Max Planck Institute for Polymer Research, Mainz , Germany.
- Solicited talk: "Hydrogen Bonding at the Ice Surface"

- Most exciting for non-scientific public talk: "Elucidating how trace gases interact with ice surfaces", by Dr. Jenée D. Cyran

Public information:
In the “Atmospheric Surface Science” session we bridge experimental and theoretical findings to elucidate water-ice-aerosol interactions that occur in the atmosphere. The focus is on the molecular level processes. We discuss the origin of the interactions and their impact on our hydrosphere in general and climate in particular.

Convener: Ahmed Abdelmonem | Co-conveners: Johannes Lützenkirchen, Merve Yesilbas
| Thu, 11 Apr, 10:45–12:30
Room 0.49
| Attendance Thu, 11 Apr, 14:00–15:45
Hall X5

Thursday, 11 April 2019 | Room 0.49

Chairperson: Ahmed Abdelmonem and Hinrich Grothe
Water-Ice-Aerosol Surface Interactions
10:45–11:00 |
| solicited
Mischa Bonn, Yuki Nagata, and Ellen Backus
11:00–11:15 |
| Highlight
Jenée D. Cyran, Ellen H.G. Backus, Marc-Jan van Zadel, and Mischa Bonn
11:15–11:30 |
Jerry Jose, Mercy Varghese, Sabu Thomas, Nandakumar Kalarikkal, and Thara Prabhakaran
Ice Nucleation on the Molecular Level
11:45–12:00 |
Ari Laaksonen, André Welti, Ana A. Piedehierro, Yrjö Viisanen, Kimmo Korhonen, and Annele Virtanen
12:00–12:15 |
André Welti, Ari Laaksonen, Ana Álvarez Piedehierro, Yrjö Viisanen, Kimmo Korhonen, and Annele Virtanen
12:15–12:30 |
HuanYu Yang, Luca Artiglia, Anthony Boucly, and Markus Ammann