Immersion freezing in particle-based cloud microphysics models
The talk will present a probabilistic perspective on singular and time-dependent models of the immersion freezing process, which is one of the ways ice forms in clouds. Immersion freezing occurs when an ice nucleus immersed in a liquid water droplet triggers freezing. Without presence of the nuclei (e.g., grains of minerals) freezing requires a lower temperature. In the study, we focus on the recurrent question in this field of research, namely the role of time in the freezing process. The tool we use is a so-called particle-based (or super-droplet) simulation which relies on tracking simulation particles, each representing a large number of droplets or ice particles. We use box- and flow-coupled models to investigate how the time-dependent and the time-independent parameterizations perform in idealized scenarios and in flow regimes relevant to ambient cloud conditions (the latter posing a challenge for singular models).
Also, in the presentation, he will also highlight how to reproduce all of the presented cloud simulations "in the cloud". Feel free to bring your laptops or any device with a browser, so you can demo together!
ZOOM:
https://illinois.zoom.us/j/82767407475?pwd=7ca6OfzVOPneyOwAULFkntXaYWaBvo.1
Meeting ID: 827 6740 7475
Pass Code: 809774