List of general questions/notes on CCSM-CAM-POP-CSIM-CLM-CPL



1. Does CAM have an explicit CFL check? (11/30/05)
For EUL and SLD dynamical cores there is an explicit check, but with FV it adjusts mass fluxes between cells according to the CFL limit. (11/30/05)

2. What do I have to look out for when tuning the climate of CAM? (12/22/05)
The climate is tuned using a succession of qualifiers.

  (a) RESTOM and RESSURF annual global means have to be within +/- 1 W/m^2 on the timescale of at least a year for the climate to not be losing or gaining significant amounts of heat.
  (b) RESTOM and RESSURF have to be equal to within, 2 ideally 3, significant figures over a multi-annual run so that the atmospheric climate remains stable.
  (c) The values of TOA net LW and SW fluxes (FLNT/FSNT) have to both be within 1 W/m^2 of 234 W/m^2 - the ERBE observation standard against which CAM is currently tuned.
  (d) LHFLX and SHFLX should be in reasonable agreement with NCEP values - about 85 W/m^2 and 16 W/m^2 respectably.
  (e) PRECT should be just under 3 mm/day and PRECH2O should be aroun 25 mm

  (a) Make sure FLNT and FSNT do not depart significantly from observations - particularly the closer to the tropics that is reached.
  (b) PREC and PRECH2O have to be in good agreement with observations.

3. What are the different files in CAM runs and what should be archived and how often?

4. What are the variables LANDM and LANDM_COSLAT used for on CAM initial files?
These files are very smoothed version of the LANDFRAC variables. They are used to smoothly transition some cloud microphysical (+others) properties. For example the value of effective radius for liquid and ice (REL/REI) are smoothy transitioned between land and ocean.