Group seminar on 10. May, 14:15 CET

Preliminary results of predictability experiments with TIGAR

Chen Wang

Predictability studies with reduced models commonly rely on the barotropic vorticity equation and its modifications. While suitable for quasi-geostrophic turbulence, such framework is not suitable for the tropics, mesoscale or the global 3D atmosphere, where divergent processes play an important role. The minimal framework for predictability research involving both Rossby and inertia-gravity waves on the sphere is the shallow-water equation set such as provided by the TIGAR model.

The model TIGAR (Transient Inertia-Gravity and Rossby wave dynamical model) enables us to separate the Rossby waves and IG waves and observe the error propagation in each type of waves. In the seminar, I will briefly introduce the theory of the TIGAR model and my predictability experiment setup. I will show some preliminary results and compare them with the previous studies. I will also share the lessons learned from running the TIGAR model.