1.3 Changes since CAM 2.0

Highlights of the software improvements include:

• Performance improvements for all three dynamical cores in the areas of:
  • load balancing
  • interprocess communication
  • physics and dynamics decompositions
  • compiler optimizations
  • memory requirements
  • vectorization
• Inclusion of a single column model (SCAM).
• New run-time controls for performance and science options.
• Ability to output a contiguous subset of columns to the history tape instead of a full field.

New science developments include:

• Updated parameterizations for prognostic cloud water, cloud ice, precipitation, and cloud fraction.
• Inclusion of a Slab Ocean Model (SOM).
• Inclusion of ISCCP cloud simulator to simulate ISCCP statistical cloud diagnostics.
• Diagnostic treatment of aerosols (sulfate, dust, sea salt, carbon, and volcanic).
• Optional prognostic treatment of sulfate aerosols.
• Improved energy conservation.
• Modifications to longwave interaction with water vapor.
• Updates to shortwave scheme for trace gas absorption
• Atmosphere-land interface now supports rain and snow phases.