CAM-SIMA history output and idealized test case milestones

The new CCPP compliant CAM code base -- CAM-SIMA -- now contains working history output infrastructure. History output and its various options (e.g., instantaneous or time-averaged fields) are required functionalities of any operational model, and it enables the developers to demonstrate the current capabilities in CAM-SIMA through visualizations. 

Snapshots of the state in CAM-SIMA in an idealized test case are shown below. The simulation is configured with the spectral-element dynamical core option, with CSLAM tracer advection* and simplified parameterizations of moist processes (e.g., cloud formation and rain autoconversion). A moist baroclinic wave test case is used (Ullrich et al. 2014) which consists of a rotating Earth-like planet initialized with two balanced, zonally-symmetric subtropical jets that are baroclinically unstable to perturbations. A small perturbation is added under one of the jets, leading to the growth of baroclinic waves and creating frontal clouds and precipitation.

*CSLAM tracer advection and the physical parameterizations are computed on a finite volume grid, separate from the spectral-element grid that is used for the dry dynamics.