[Ncep.list.emc.fv3gfs_tickets] FV3GFS Ticket #20: Update global_cycle to run on FV3 cubed-sphere grid

[FV3GFS Trac Ticket]

#20: Update global_cycle to run on FV3 cubed-sphere grid
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  Reporter:  george.gayno@…  |      Owner:  george.gayno@…
      Type:  task            |     Status:  accepted
  Priority:  major           |  Milestone:
 Component:  component1      |    Version:
Resolution:                  |   Keywords:
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Comment (by george.gayno@…):

 During testing, Rahul alertly pointed out how the input restart files
 (from his recent model run) contain a snow cover record ('sncovr'), but
 the files output by `CYCLE` do not.  The snow cover record is optional and
 was added by Rusty.  Here is Rusty's explanation from his Aug 7th email:

 {{{
 This field was added to ensure bit-reproducibility across restarts.

 When I originally looked over chgres, the logic for sncovr was commented
 out.  In the
 GSM-GFS, the sncovr field is initialized in read_fix.f.

 In FV3-GFS, it is not a mandatory restart variable.  If it exists in the
 sfc_data.tile?.nc file, it is read in and used.  If is absent, the sncovr
 initialization
 logic is used to create the variable.
 }}}

 `CYCLE` and `CHGRES` only update snow depth and snow liquid water
 equivalent.

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Ticket URL: <https://svnemc.ncep.noaa.gov/trac/fv3gfs/ticket/20#comment:19>
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