Środowiskowe Seminarium Fizyki Atmosfery

A series of large-eddy simulations (LES) are carried out to investigate the grid resolution necessary to obtain an accurate numerical solution of a shallow maritime cumuli field. The experimental setup is based on Barbados Oceanographic and Meteorological Experiment (BOMEX). For the LES model, Scalable Computing for Advanced Library and Environment (SCALE) is used. For the cloud microphysics, the super-droplet method (SDM) and the two-moment bulk scheme of Seiki and Nakajima (2014) are adopted. The results indicate that for both cloud microphysics schemes, a gridresolution less than 10 m is necessary to accurately simulate a shallow maritime cumuli field. Our grid refinement analysis also shows that there is a significant contribution from small cumulus clouds to the total cloud cover, and such cumuli are generated by small-scale updrafts that can only be resolved at a fine resolution. This is a collaboration work with Yousuke Sato (Nagoya U) and Hirofumi Tomita (RIKEN).