Parameterizations of Ice Formation Derived from AIDA Cloud Simulation Experiments

摘要

Since 2003, the AIDA cloud chamber has been used for comprehensive series of ice nucleation experiments with a variety of different aerosols and in wide ranges of temperature, relative humidity and cooling rate. Ice nucleation onset and ice formation rates have been obtained as a function of aerosol parameters, ice supersaturation, temperature and cooling rate for homogeneous freezing of water droplets and solution particles, immersion freezing at and below water saturation, and deposition ice nucleation between ice and water saturation. The AIDA team has started a consistent and comprehensive re-analysis of the 10 year data set to provide a new set of parameters for formulating the ice formation in atmospheric models as function of aerosol properties, temperature and humidity. Here we present basic concepts and some selected results.