Resolves Issue 99

[sanAkel]

This PR provides what is needed to be done:

That is the following:

1. As in RTOFS v2.5, use the NCODA output file: ${typec}_${dtg}_0000_analfld where typec=icecov_sfc_1o${SIZN}. and SIZN="${IDM}x${JDM}"
2. Replace these lines that convert: icecov_${dtg}_analfld ➡️ ssmi.$dtg.r; note CICE4 reads file: ssmi.r with something else that will work with CICE6.

Proof of the ⬆️ statement:

santha.akella@dlogin02:~/my_stmp/test> pwd -P
/lfs/h2/emc/stmp/santha.akella/test
santha.akella@dlogin02:~/my_stmp/test> 
santha.akella@dlogin02:~/my_stmp/test> ls -atlh1
total 33M
drwxr-sr-x 2 santha.akella emc 4.0K Jan  2 02:19 .
-rw-r--r-- 1 santha.akella emc  57M Jan  2 02:19 icecov_20251215_analfld.nc
-rw-r--r-- 1 santha.akella emc  201 Jan  2 02:19 output.log
lrwxrwxrwx 1 santha.akella emc   78 Jan  2 02:19 depth_GLBb0.08_09m11ob2_mom6.nc -> /lfs/h2/emc/ptmp/santha.akella/RTOFS_GLO//fix//depth_GLBb0.08_09m11ob2_mom6.nc
lrwxrwxrwx 1 santha.akella emc  156 Jan  2 02:19 icecov_20251215_analfld -> /lfs/h2/emc/couple/noscrub/zulema.garraffo/COMDIR/prod/com/rtofs/v2.5/rtofs.20251216//ncoda/hycom_var/restart/icecov_sfc_1o4500x3297_2025121500_0000_analfld
-rwxr-xr-x 1 santha.akella emc  924 Jan  2 02:19 test.sh
drwxr-sr-x 3 santha.akella emc 4.0K Jan  1 20:45 ..
santha.akella@dlogin02:~/my_stmp/test> 
santha.akella@dlogin02:~/my_stmp/test> cat output.log 
STATUS: All inputs validated. Beginning conversion for icecov...
Summary for sic: Min=0.0000, Max=1.0000
SUCCESS: Created NetCDF [sic] at /lfs/h2/emc/stmp/santha.akella/test/icecov_20251215_analfld.nc
santha.akella@dlogin02:~/my_stmp/test> 
santha.akella@dlogin02:~/my_stmp/test> ncdump -h icecov_20251215_analfld.nc 
netcdf icecov_20251215_analfld {
dimensions:
        ny = 3297 ;
        nx = 4500 ;
        time = 1 ;
variables:
        float sic(ny, nx) ;
                sic:_FillValue = -9.99e+33f ;
                sic:units = "fraction" ;
                sic:long_name = "Ice Concentration" ;
                sic:scale_factor_applied = 0.01 ;
        int64 time(time) ;
                time:units = "days since 2025-12-15 00:00:00" ;
                time:calendar = "proleptic_gregorian" ;
}

cat test.sh:

#!/bin/sh

export DATAROOT=/lfs/h2/emc/stmp/santha.akella/test/
export jobid=icecov_sic
export HOMErtofs=/lfs/h2/emc/ptmp/santha.akella/RTOFS_GLO/
export USHrtofs=${HOMErtofs}/ush/
export FIXrtofs=${HOMErtofs}/fix/
export PDY=20251216
export dtg=20251215

# py module-- JOB card needs to have it -- Dan --
source $HOMErtofs/scripts/load_py_modules.sh

CONMIN=/lfs/h2/emc/couple/noscrub/zulema.garraffo/COMDIR/prod/com/rtofs/v2.5/rtofs.${PDY}/
IDM=4500
JDM=3297
var_name="icecov"
#var_name="icethk"
#var_name="icetmp"
#var_name="mixlyr"

SIZN="${IDM}x${JDM}"
typec=${var_name}_sfc_1o${SIZN}

cd ${DATAROOT}

# link to topography
ln -f -s ${FIXrtofs}/depth_GLBb0.08_09m11ob2_mom6.nc depth_GLBb0.08_09m11ob2_mom6.nc

# input file
ln -sf $CONMIN/ncoda/hycom_var/restart/${typec}_${dtg}00_0000_analfld ./${var_name}_${dtg}_analfld

# run
$HOMErtofs/ush/rtofs_glo2d_ice.sh depth_GLBb0.08_09m11ob2_mom6.nc ${var_name}_${dtg}_analfld ${var_name} ${DATAROOT}
err=$? 
echo " error from ${HOMErtofs}/ush/rtofs_glo2d_ice.sh =" $err

hence it resolves #99

[sanAkel]

@DanIredell-NOAA Can you please DO NOT merge yet!

As you said, merging @zgarraffo's incremental update needs to be reconciled in a top level script: scripts/exrtofs_glo_ncoda_inc.sh (GitHub has identified.)