[Ncep.list.emc.fv3gfs_tickets] FV3GFS Ticket #11: Cycling workflow.
FV3GFS Trac Ticket
ncep.list.emc.fv3gfs_tickets at noaa.gov
Tue Aug 1 04:08:47 UTC 2017
#11: Cycling workflow.
-------------------------+-------------------------------------------------
Reporter: | Owner: fanglin.yang@…
rahul.mahajan@… | Status: reopened
Type: | Milestone:
enhancement | Version:
Priority: major | Keywords:
Component: component1 | workflow,scripting,cycling,utilities
Resolution: |
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Comment (by fanglin.yang@…):
Based the discussion at a small meeting attended by Moorthi, George, Jeff,
Rahul, Xu, Daryl and Fanglin, two actionable items were identified.
1) Short-time: the following parameter settings will n be used for cycled
experiments
If [ $cdump = gdas ]; then
FTSFS=0; FAISS=0; FAISL=0
FSMCL(2:4)=60
FSNOL=99999
If [ $cyc = 18 ]; then FSNOL=-2; fi
FNTSFA = dump rgtsst
FNACNA = dump seaince
FNSNOA = dump snow
fi
If [ $cdump = gfs ]; then
FTSFS=90;
FAISS=99999; FAISL=99999
FSMCL(2:4)=99999
FSNOL=99999 ?????
FNTSFA = “ “
FNACNA = “ “
FNSNOA = “ “
fi
Essentially, GDAS will run gcycle at kdt=1 like the current offline
global_cycle to update surface analyses. GFS cycle will then pick up the
analyses from its guess, the 6-hr gdas forecast. Note that snow in the GFS
cycle may not get updated promptly in such a simplified approach. In
current operational GFS cycle updates snow as soon as new snow analysis
becomes available.
2) Long-Term (in a few weeks/months): George Gayno will update the
offline global_cycle to read in FV3GFS surface restart file (including
NSST) on model native grid, interpolate observations (snow, sst, ice
etc) and NSST analyses after running GSI (on Gaussian grid) to model
native grid, update and write out new sfcanl on model native grid for
"warm" start. The model will no longer need to read in "sfc increments".
Fanglin
Replying to [comment:76 rahul.mahajan@…]:
> Replying to [comment:75 fanglin.yang@…]:
> Fanglin,
>
> Thank you for your active participation in identifying and resolving the
issues with cycling the surface variables. I will update the {{{FHCYC}}}
variable value as per your suggestion.
>
> Thanks,
> Rahul
>
> > Rahul, we (Xu, George, Helin and I myself ) are actively looking into
the issue. In the NEMS GFS world, gcycle is called offline as part of
the GDAS/GFS ANAL step to update sfcanl to all avaliable observations
(including SST, snow, ice, soil moisture and vegetation greeness etc).
Since in the FV3GFS world gcycle is no longer called, we need to make sure
those updates are executed as part of the forecast at the first time step.
Initialy investigation indicates that both the model code and scripts need
to be updated.
> >
> > I also noticed you have FHCYC=6 in your cycled experiment. Please
change it to 24.
> >
> > Fanglin
--
Ticket URL: <https://svnemc.ncep.noaa.gov/trac/fv3gfs/ticket/11#comment:79>
fv3gfs <https://svnemc.ncep.noaa.gov/trac/fv3gfs>
NGGPS FV3GFS Development
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