Impact of time-scales in physical parameterizations on simulated precipitation using CAM-MPAS

To represent finer-scale phenomena using numerical weather and climate models, time step must decrease for a stable and accurate simulation. Since high-resolution simulation requires considerable computing resources, most of the models use different size of time steps for dynamics and each physics module. This study examines the sensitivity of simulated precipitation to the time-step for moist physics in CAM-MPAS. Furthermore, impact of convective adjustment time-scale in deep convection parameterization is investigated in the physics suite of the CAM5.