CAM-SE-CSLAM: Consistent finite-volume transport with spectral-element dynamics

Abstract:

For the development of CAM-SE-CSLAM (= basically CAM-SE with accelerated tracer transport), the coupling between two distinct numerical methods is necessary with strict requirements for consistency. Taylor, Overfelt and Ullrich have derived a method to calculate implied spectral element air mass fluxes through CSLAM control volume edges. A new CSLAM algorithm has been developed that through an iterative algorithm finds swept areas that exactly (to round-off) match the spectral element fluxes thereby ensuring strict consistency between the two methods.

Acronyms:

CAM-SE: NCAR's Community Atmosphere Model using the spectral-element dynamical core

CSLAM: Conservative Semi-Lagrangian Multi-tracer transport scheme