Updates:

1
Updates

• Implementation of subcolumn cloud generator
• Radiation calculation using the subcolumns

2
Cloud subcolumn generator

• The subgrid cloud variability is represented by
• a set of subcolumns generated stochastically

3

• The subcolumn generator is flexible
• Flexible overlap assumption
• maximum
• random
• maximum random
• exponential overlap
• Flexible distribution of condensate
• homogenous clouds (current)
• inhomogenous clouds
• (future development link with Ben Johnson PDF
  scheme)

4
Radiation calculation using the subcolumns

• Use the subcolumns to compute the radiation using
  the
• Monte Carlo Independent Column Approximation
  (McICA)
• McICA in CAM radiation scheme
• Implement McICA in the SW scheme (in progress)
• Note The LW broadband is not easily adaptable to
  McICA
• Implement RRTM in CAM3
• AER implements a McICA version of the RRTM code
  (in progress)
• Note CAM produces particles too big for RRTM
  (outstanding issue)