Department Seminar: Peter Caldwell

Title: The Simple Cloud-Resolving E3SM Atmosphere Model – Introduction and First Results

Abstract: The Simple Cloud Resolving E3SM Atmosphere Model (SCREAM) is a new global atmosphere model built to run fast on exascale computers at storm-resolving resolutions. Speed is achieved via the Kokkos C++ library, which handles on-node parallelism for GPUs, CPUs, and other architectures. Using Kokkos required rewriting the model in C++, which allowed for a rethinking of software design. Lessons learned while building this model will naturally be one focus on this talk, but emphasis will also be placed on understanding the climate of the new model and the scientific discoveries it enables. In particular, SCREAM has already been used to understand what controls anvil clouds on a warming planet and how fine grid spacing can be before non-hydrostatic effect become important.