This session welcomes submissions on the formation, processing and interaction of ice particles in the atmosphere, based on laboratory investigations, aerosol chamber studies, distinctive field observations and theoretical modelling.

There are many phenomena in atmospheric chemistry and physics in which ice is involved: including homogeneous and heterogeneous ice nucleation, secondary ice formation, processing of ice crystals in mixed phase, cirrus clouds and PSCs, heterogeneous chemistry and uptake of trace gases on ice, morphology of ice crystals, inclusion of trace substances in the ice matrix, microphysical properties of mixed-phase and ice clouds, transport processes in mixed phase and ice clouds, radiative properties of mixed phase and ice clouds, influence of ice characteristics on precipitation processes, and the representation and role of the ice phase in weather and climate models. Laboratory models applied to these questions range from aerosol and cloud chambers to levitation traps and sophisticated reaction cells, often in close connection with field studies and modelling expertise. Only rather recently modern surface techniques from the fields of catalysis and materials science have been adapted to atmospheric investigations. Originally, many of these techniques required ultra-high vacuum, but are now accessible also at ambient pressure. Examples are found in electron microscopy, mass spectroscopy, reflection IR spectroscopy, X-ray photoelectron spectroscopy, and molecular beam experiments.

This session intends to bring together research groups using different approaches and methodologies. The aim is to compare the different results and to develop joint strategies for future investigations and proposals. We particularly encourage submissions highlighting results from major national and international projects focused on ice-related processes, such as: Thin Ice Net, HitT, The Tropospheric Ice Phase, PAZI-2, as well as field experiments such as HALO, CRYSTAL FACE, CLACE, CIRRUS, TWP-ICE and others.

Solicited Speakers: Jan Pettersson (University of Gothenburg, S) and Thomas Leisner (Karlsruhe Institute of Technology, D)