Ice particles in the atmosphere influence cloud dynamics and optical properties, formation of precipitation and climate. However, large uncertainties are associated with these effects and their potential feedbacks. This session aims to cover a wide variety of subjects related to ice in the atmosphere, in order to facilitate exchange of knowledge between disciplines. We welcome experimental, theoretical and modeling studies of ice nucleating particles as well as cirrus and mixed-phase clouds in the field and laboratory settings. Studies of ice nucleating particles, ice crystal properties, ice residual particles and ice cloud formation, microphysics, life cycle and radiative properties are most welcome.