1. A new model that resolves cloud-drop size with thousands of bin is developed to simulate the growth of cloud drops by collision. The model is then evaluated with the analytic solution, showing that the model is quite accurate. Finally, the model is extended to properly incorporate the effect of radiation on drop growth.
2. The model is extended to simulate how radiation impacts the properties of ice crystals (size, shape and orientation) in diamond dust.
3. The model is used to simulate the radiatively induced broadening of ice crystal spectrum.
4. The model is used to simulate the effect of CCN (cloud condensation nuclei) on warm rain initiation.