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
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