Polar clouds play a fundamental role in high latitude climate but are challenging to model due to uncertainties in representing fundamental cloud processes, such as microphysical processes that determine phase partitioning between ice and radiatively important cloud liquid water, which drives the turbulence that maintains the system. New observations of polar clouds can address questions about the role of surface fluxes, coupling with atmospheric radiation, potential secondary ice production, sources of aerosols, impacts on sea ice and the surface energy budget, and triggers for transitions, among other processes. Recent field campaigns provide new insights, new hypotheses, but also new questions, about the mechanisms and feedback that cause the formation and persistence of polar clouds.

This session welcomes papers on scientific results from recent campaigns such as ARCSIX, CAESAR, (AC)³, MOSAiC, among other Arctic expeditions and campaigns. Clouds of interest include mixed-phase clouds, ice clouds, cold-air outbreaks, and clouds over different surface conditions. In addition, we welcome papers on new technologies and strategies for observing polar clouds.