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Running the GFS Parallel System Hybrid GSI/ EnKF on Zeus

Running the GFS Parallel System Hybrid GSI/ EnKF on Zeus. NOAA/NWS/NCEP/EMC. 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

joel-lloyd
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Running the GFS Parallel System Hybrid GSI/ EnKF on Zeus

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  1. Running the GFS Parallel System Hybrid GSI/EnKF on Zeus NOAA/NWS/NCEP/EMC

  2. 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

  3. Documentation & Help Website: http://www.emc.ncep.noaa.gov/GFS/exp.php Listserv (Glopara Support): NCEP.List.EMC.Glopara-Support@noaa.gov In Person: Stop by my cube next to the 2nd floor breakroom, I don’t bite 

  4. Hybrid Var-EnKF • What’s hybrid in the hybridGDAS? • 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 • fit to bkg • fit to obs • ens fcst • fit to background •  fit to obs

  5. GDAS Hybrid Var-EnKF Flow Chart prep anal angu fcst post arch 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

  6. 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)

  7. 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

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

  9. 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

  10. 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

  11. 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

  12. 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

  13. Configuration File – New Variables • To turn the Hybrid EnKF on: • DOHYBVAR=YES • Tells analysis to use ensemble product • DOENKF=YES • Turns on ensemble process scripts

  14. 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_mem$MEM($MEM = member # 1-80) • siganl_$CDATE_mem$MEM Where do I find Hybrid EnKF ICs?

  15. 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/prhy2s • Tutorial input • HPSS: /NCEPDEV/hpssuser/g01/wx24kh/Zeus/TUTORIAL/prhy2s

  16. 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 prep anal angu fcst post arch echk echk vrfy eobs eomn eupd ecen efmn epos eomg## efcs## earc

  17. GFS Output - Dayfiles Text output files containing details of run, as well as error messages for troubleshooting, found in $COMROT Naming convention: $PSLOT$CDATE$CDUMP$CSTEP.dayfile New Hybrid EnKF CSTEPs: * echk = epre

  18. GFS Output – New Hybrid EnKF Data http://www.emc.ncep.noaa.gov/GFS/exp.php#All_files

  19. Documentation & Help Website: http://www.emc.ncep.noaa.gov/GFS/exp.php Listserv (Glopara Support): NCEP.List.EMC.Glopara-Support@noaa.gov In Person: Stop by my cube next to the 2nd floor breakroom 

  20. Questions?

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