Date post: | 01-Jan-2016 |
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This presentation contains…
1. Overview of Hybrid GDAS structure
2. 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
3. Suggestions for running experiments with the Hybrid EnKF
Documentation & Help
Website: http://www.emc.ncep.noaa.gov/GFS/exp.php
Listserv (Glopara Support):
In Person:
Stop by my cube next to the 2nd floor breakroom, I don’t bite
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What’s hybrid in the hybrid GDAS?Augment fixed background error with
information from ensemble forecastsBenefits:
Improve forecastsmid-latitude mass fields tropical winds fits to observationscool season CONUS precipitation
Hybrid Var-EnKF
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GDAS Hybrid Var-EnKF Flow Chartanal
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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 output80 member T254L64 ensemble
1316 files / cycle90.8 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 ensembleT254 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)
1. New variables in configuration file
2. New model input
3. Submitting jobs with the Hybrid EnKF
4. New model output
Demo matches Zeus control prhy2s:
/NCEPDEV/hpssuser/g01/wx24kh/Zeus/para_gfs/prhy2s
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 = 2012072512CDUMP = gdasCSTEP = fcst1gfs_cyc = 1 (run only 00z GFS)DOENKF & DOHYBVAR = YES (Hybrid EnKF DA)
EDATE = 2012072600EDUMP = gdasESTEP = prep
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Configuration File – New Variables
To turn the Hybrid EnKF on:
DOHYBVAR=YESTells analysis to use ensemble product
DOENKF=YESTurns on ensemble process scripts
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Initial Conditions in $COMROT
Acquire initial condition files and place in $COMROT:
1. biascr.$CDUMP.$CDATE2. satang.$CDUMP.$CDATE3. sfcanl.$CDUMP.$CDATE4. siganl.$CDUMP.$CDATE5. sfcanl_$CDATE_mem$MEM ($MEM = member # 1-80)
6. siganl_$CDATE_mem$MEM
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/prhy2s
Tutorial input
HPSS: /NCEPDEV/hpssuser/g01/wx24kh/Zeus/TUTORIAL/prhy2s
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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
prep anal
eobs eomn
eomg##
eupd ecen efmn
efcs##
epos
fcst post
echk echkarch
earc
angu
vrfy
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:
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• echk*• eobs• eomn• eomg##• eupd
• ecen• efmn• efcs##• epos• earc
* echk = epre
Documentation & Help
Website: http://www.emc.ncep.noaa.gov/GFS/exp.php
Listserv (Glopara Support):
In Person:
Stop by my cube next to the 2nd floor breakroom
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