Running the GFS Parallel System Hybrid GSI/EnKF on Zeus

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Running the GFS Parallel System Hybrid
GSI/EnKF on Zeus
NOAA/NWS/NCEP/EMC
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This presentation contains

• Overview of Hybrid GDAS structure
• Running an experiment on Zeus w/ Hybrid (DEMO)
• New variables in configuration file
• New model input
• Submitting jobs with the Hybrid EnKF
• New model output
• Suggestions for running experiments with the
  Hybrid EnKF

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Documentation Help

• Website http//www.emc.ncep.noaa.gov/GFS/exp.php
• Listserv (Glopara Support)
• NCEP.List.EMC.Glopara-Support_at_noaa.gov
• In Person
• Stop by my cube next to the 2nd floor breakroom,
  I dont bite ?

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Hybrid Var-EnKF

• Whats hybrid in the hybrid GDAS?
• Augment fixed background error with information
  from ensemble forecasts
• Benefits
• Improve forecasts
• mid-latitude mass fields
• tropical winds
• fits to observations
• cool season CONUS precipitation

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GDAS Hybrid Var-EnKF Flow Chart
prep
anal
fcst
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angu
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echk
echk
vrfy
eobs
eomn
eupd
ecen
efmn
epos
eomg01
efcs01
earc
eomg02
efcs02
eomg03
efcs03
eomg04
efcs04
eomg05
efcs05
eomg06
efcs06
eomg07
efcs07
eomg08
efcs08
eomg09
efcs09
eomg10
efcs10
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EnKF job steps (start to update)

• echk
• check file availability
• eobs
• select observations used in ensemble innovations
• eomn
• submit and monitor ensemble innovation jobs
• eomg01,, eomg10
• compute ensemble innovations (8 members/job)
• eupd
• compute ensemble analyses (EnKF update code)

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EnKF job steps (re-center to archive)

• ecen
• recenter ensemble analyses about hires analysis
• efmn
• submit and monitor ensemble forecast jobs
• efcs01,, efcs10
• run ens fcst (8 members/job)
• epos
• compute ensemble mean
• spectrally smooth ens fcst
• earc
• save data cleanup

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WARNING!!!

• Hybrid GDAS generates a LOT of output
• 80 member T254L64 ensemble
• 1316 files / cycle
• 90.8 Gbytes / cycle

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Alternatives

• Ask yourself - Do I really need to run hybrid
  GDAS?
• Can I use a lower resolution?
• T382 hires, T190 ensemble
• T254 hires, T126 ensemble
• Can I just run the GFS long forecast?
• Use ICs from Hybrid EnKF control runs

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GFS Hybrid EnKF Experiment (DEMO)

• New variables in configuration file
• New model input
• Submitting jobs with the Hybrid EnKF
• New model output
• Demo matches Zeus control prhy2s
• /NCEPDEV/hpssuser/g01/wx24kh/Zeus/para_gfs/prhy2s

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Demo time

• Needed files
• Config file rlist/scratch2/portfolios/NCEPDEV
  /global/save/Kate.Howard/TUTORIAL/prhy2s
• Input/output in COMROT
• /scratch2/portfolios/NCEPDEV/global/noscrub/Kate.
  Howard/TUTORIAL/prhy2s

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Demo time

• Experiment prhy2s
• CDATE 2012072512
• CDUMP gdas
• CSTEP fcst1
• gfs_cyc 1 (run only 00z GFS)
• DOENKF DOHYBVAR YES (Hybrid EnKF DA)
• EDATE 2012072600
• EDUMP gdas
• ESTEP prep

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Configuration File New Variables

• To turn the Hybrid EnKF on
• DOHYBVARYES
• Tells analysis to use ensemble product
• DOENKFYES
• Turns on ensemble process scripts

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Initial Conditions in COMROT

• Acquire initial condition files and place in
  COMROT
• biascr.CDUMP.CDATE
• satang.CDUMP.CDATE
• sfcanl.CDUMP.CDATE
• siganl.CDUMP.CDATE
• sfcanl_CDATE_memMEM (MEM member 1-80)
• siganl_CDATE_memMEM
• Where do I find Hybrid EnKF ICs?

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Where to find ICs

• Places to acquire Hybrid EnKF control ICs for
  Zeus
• prhy2s - Summer 2012 control (July September)
• HPSS /NCEPDEV/hpssuser/g01/wx24kh/Zeus/para_gfs/p
  rhy2s
• Tutorial input
• HPSS /NCEPDEV/hpssuser/g01/wx24kh/Zeus/TUTORIAL/p
  rhy2s

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Submitting the GFS w/ Hybrid EnKF

• While in EXPDIR, using the psub script from
  config file, type the following on the command
  line
• PSUB CONFIG CDATE gdas fcst1
• PSUB CONFIG CDATE gdas efmn

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GFS Output - Dayfiles

• Text output files containing details of run, as
  well as error messages for troubleshooting, found
  in COMROT
• Naming convention
• PSLOTCDATECDUMPCSTEP.dayfile
• New Hybrid EnKF CSTEPs

echk eobs eomn eomg eupd ecen efmn efcs epos earc
echk epre
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GFS Output New Hybrid EnKF Data
http//www.emc.ncep.noaa.gov/GFS/exp.phpAll_files
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Documentation Help

• Website http//www.emc.ncep.noaa.gov/GFS/exp.php
• Listserv (Glopara Support)
• NCEP.List.EMC.Glopara-Support_at_noaa.gov
• In Person
• Stop by my cube next to the 2nd floor breakroom ?

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Questions?