CCSM high res

This page consolidates notes and status on the attempt to run CCSM with at least and eddy-resolving ocean (0.1 degree) and 0.25 or 0.5 degree atmosphere.

Specs:

Ocean/ice always on tripole grid.

CCSM POP2 Task List: (updated 2/14/2008 by NN)

• Port LANL-POP infrastructure into CCSM-POP (Phil; in progress)
• Standalone version of CCSM4-POP working on Phil's laptop (Phil;done)
• Binary tavg output (Nancy; done; output has been validated by Mat)
• parallel I/O (John)
• barotropic solver (John; after Phil's infrastructure changes are done)
• run-time disabling of unwanted diagnostics such as bsf, mosf, mht,regional (eg, NINO), budgets (Mat, Nancy; BSF,MOC,transports can now be totally disabled )
• region mask done for budgets, ms balance (Julie, Mat, Nancy; ms balance done; Nancy is testing in ccsm4 gx1v5 context)
• run-time control for NINO diagnostics (Nancy)
• runoff (Rob, Art)
• handling system calls (John notes that Blue Gene does not support system calls) (Nancy)
• remove _HIRES ifdefs that are being used to disable some features and replace with logical controls (Nancy)

  Full Model (0.5x0.1, cpl7)

• BlueGene
  • Runs for a couple of days on up to 2000 procs. No output
• Atlas
  • Runs for 4.6 days on 480 procs. Daily netcdf output successful

    Ocean-ice (0.1)

• with Hunke coupler and older POP/CICE code base
  • runs for 1.5 years with old NCAR/NCEP forcing
  • exits quickly with Normal Year forcing
• with cpl7: not tried

  Repo:

  Code changes for POP are in: https://svn-ccsm-models.cgd.ucar.edu/pop2/branches/hrpop/
  Fully coupled tag: https://svn-ccsm-models.cgd.ucar.edu/ccsm4/exp_tags/alpha18_jmd01/

  Status:

  Grid circle apparent in first monthly average field.
• Suggestions:
  • Run with data atm/lnd ? See if the feedback is in the ice/ocean to atm interpolations. Need mapping file for T63 --> tx0.1v2
  • Try using different type mapping. May indicate error in one particular type of mapping [Art]
  • Try using a Asymmetric test function [Brian K.]
  • Examine daily averaged or instantaneous fields from CAM. Is grid circle present 1 day into simulation or does it appear later.

    Related projects:

    Parallel I-O - needed for output on BlueGene
    CCSM on BlueGene - All resolutions on BlueGene