[Ncep.list.emc.fv3gfs_tickets] FV3GFS Ticket #12: Changes for nests

FV3GFS Trac Ticket ncep.list.emc.fv3gfs_tickets at noaa.gov
Wed Apr 5 17:07:44 UTC 2017

#12: Changes for nests
  Reporter:  tom.black@…  |      Owner:  george.gayno@…
      Type:  enhancement  |     Status:  accepted
  Priority:  major        |  Milestone:
 Component:  component1   |    Version:
Resolution:               |   Keywords:  nest

Comment (by george.gayno@…):

 As mentioned in comment:8, the build on Theia uses "-O3" and on Cray uses
 "-O0".  I used Grads to view the output orography files created on each
 machine.  I only checked tiles 1 and 7.  And only the 'rlat', 'rlon',
 'slmsk', 'land_frac', 'orog_filt' and 'orog_raw' records.

 For tile 1, only the 'land_frac' record was different.  Only one point was
 different.  This difference was 'floating point'.

 For tile 7 (the nest), the 'land_frac' record had differences between
 -.002 and -.001.  The 'orog_raw' and 'orog_filt' records had differences
 between -1.5 and 0.9.  All differences were confined to a single column in
 the middle of the grid.

Ticket URL: <https://svnemc.ncep.noaa.gov/trac/fv3gfs/ticket/12#comment:11>
fv3gfs <https://svnemc.ncep.noaa.gov/trac/fv3gfs>
NGGPS FV3GFS Development

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