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Picard Convergence Failure

zwolff@uci_edu

New Member
Hello, I  am running CICE v5 at the default global 3 degree resolution (gx3 grid provided) and the only changes being I am reading in NCEP/NCAR Reanalysis NetCDF files as data (starting with 1980) and almost immediately the model crashes with a picard convergence error. The exact error message from the ice.log file is below.   picard convergence failed!           0  -1.9045826499242648                            NaN           1   0.0000000000000000        0.0000000000000000       -110220000.00000000                1  -2.3330864777318179                            NaN   31.000000000000000        1.0000000000001563E-002  0.75000000000000022       -85268533.086176649                2  -2.3330864777318179                            NaN   31.000000000000000        1.0000000000001563E-002  0.75000000000000022       -85268533.086176649                3  -2.3330864777318179                            NaN   31.000000000000000        1.0000000000001563E-002  0.75000000000000022       -85268533.086176649                4  -2.3330864777318179                            NaN   31.000000000000000        1.0000000000001563E-002  0.75000000000000022       -85268533.086176649                5  -2.3330864777318179                            NaN   31.000000000000000        1.0000000000001563E-002  0.75000000000000022       -85268533.086176649                6  -2.3330864777318179                            NaN   31.000000000000000        1.0000000000001563E-002  0.75000000000000022       -85268533.086176649                7  -2.3330864777318179                            NaN   31.000000000000000        1.0000000000001563E-002  0.75000000000000022       -85268533.086176649      ------------------------------------- istep1, my_task, iblk =           3           0           3 Global block:           5 Global i and j:          12          38 Lat, Lon:  -15.345122324731349        1.8000000500896045      aice:  0.84439121202229650      ice: Vertical thermo error: temperature_changes_salinity: Picard solver non-convapplication called MPI_Abort(MPI_COMM_WORLD, 128) - process 0 ------------------------------------- picard convergence failed!           0  -1.9045826499242648                            NaN           1   0.0000000000000000        0.0000000000000000       -110220000.00000000                1  -2.3330864777318179                            NaN   31.000000000000000        1.0000000000001563E-002  0.75000000000000022       -85268533.086176649                2  -2.3330864777318179                            NaN   31.000000000000000        1.0000000000001563E-002  0.75000000000000022       -85268533.086176649                3  -2.3330864777318179                            NaN   31.000000000000000        1.0000000000001563E-002  0.75000000000000022       -85268533.086176649                4  -2.3330864777318179                            NaN   31.000000000000000        1.0000000000001563E-002  0.75000000000000022       -85268533.086176649                5  -2.3330864777318179                            NaN   31.000000000000000        1.0000000000001563E-002  0.75000000000000022       -85268533.086176649      Is this an error with the data, the way it is being read in, or the model configuration? Thank You, Zach Wolff 
 

dbailey

CSEG and Liaisons
Staff member
Sorry to take so long on this. I was away on vacation. The first thing that concerns me is the NaN appearing in your output. Also, this is a Southern Hemisphere equatorial point where there should not be ice, unless you are running a snowball Earth simulation. I would first check that your forcing is correctly interpolated onto the gx3 grid and make sure it is what you expect. Then I would double check the initial condition (ice_ic) file you are using.Dave
 
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