[Ncep.list.emc.fv3gfs_tickets] FV3GFS Ticket #21: update fv3gfs workflow to use the latest model with Write Component and Unified Post and to include NSST in 2d history output for DA

FV3GFS Trac Ticket ncep.list.emc.fv3gfs_tickets at noaa.gov
Sun Oct 8 03:22:13 UTC 2017


#21: update fv3gfs workflow to use the latest model with Write Component and
Unified Post and to include NSST in 2d history output for DA
-----------------------------+--------------------------
  Reporter:  fanglin.yang@…  |      Owner:  fanglin yang
      Type:  enhancement     |     Status:  new
  Priority:  major           |  Milestone:
 Component:  component1      |    Version:
Resolution:                  |   Keywords:
-----------------------------+--------------------------

Comment (by fanglin.yang@…):

 Cycled experiments with DA were carried out using the newest FV3 branch
 tic26 and the newest workflow tic21.   Write Component was turned off,
 therefore FMS was still used for the I/O.  The first gdas/fcst and
 enkf/efcs forecasts all appeared to be fine;  however, the 2nd cycle
 enkf/efcs forecast failed with out of range temperature error.  Rerun the
 same case using the FV3 trunk version does not have this problem.
 Experiments carried out on Cray and Theia both showed the same symptom.

 It was found that in FV3 tic26 branch output of hgtsfc is defined as
 height in meters.  While in earlier FV3 versions it is defined as
 geopotential height in gpm.  The post-processing tools regrid_nemsio.fd
 and fv3nc2nemsio.fd both expect hgtsfc in the 6-tile netCDF history files
 being in gpm.  hgtsfc is scaled by 1/grav in these two programs before
 being written out in nemsio files on either gaussian or lat-lon grid.

 To use FV3 tic26 branch, regrid_nemsio.fd and fv3nc2nemsio.fd in workflow
 branch tic21 have been updated to remove the scaling by 1/grav.

 Tests are underway.

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Ticket URL: <https://svnemc.ncep.noaa.gov/trac/fv3gfs/ticket/21#comment:21>
fv3gfs <https://svnemc.ncep.noaa.gov/trac/fv3gfs>
NGGPS FV3GFS Development



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