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Implementation of KENDA at ARPA-SIMC and first experiences with an OSSE. Chiara Marsigli Tiziana Paccagnella ARPA Emilia-Romagna, SIMC. Outline. Implementation of KENDA at ECMWF (sms system) Set-up of the OSSE suite First results Discussion items. KENDA suite at ECMWF.

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implementation of kenda at arpa simc and first experiences with an osse

Implementation of KENDA at ARPA-SIMC and first experiences with an OSSE

Chiara Marsigli

Tiziana Paccagnella

ARPA Emilia-Romagna, SIMC

outline
Outline
  • Implementationof KENDA at ECMWF (sms system)
  • Set-up of the OSSE suite
  • First results
  • Discussionitems
kenda suite at ecmwf
KENDA suite at ECMWF

creationof the directories

and set-up of the runs

MARS retrievalofconventionalobservation

(ARPA) bufr2netcdf

getBoundaryConditionsfrom ECMWF ENS (and Ics for the cold start)

currently 20 members

int2lm

getanalysisfromprevious KENDA cycle

3-hourly cycles

COSMO run

KENDA analysisstep

processing of output

output archiving

osse set up
OSSE set-up

15

18

21

24

00

03

06

09

12

NATURE RUN

optimalconfiguration, generates the pseudo-observations(foffiles)

FOF

FOF

FOF

FOF

FOF

FOF

FOF

10 IC originalqv

KENDA CYCLE

10 IC halvedqv

CONTROL RUN

“dried” run, qvreducedbyhalf in the InitialCondition

kenda osse suite at ecmwf
KENDA OSSE suite at ECMWF

getfoffrom nature run (psuedo-observations)

modificationof the IC (like in the controlrun)

onlyformembers 1-10

  • Executionof:
  • Nature run
  • Controlrun
  • KENDA OSSE
  • isdrivenby the specification in the .def file (filefor the definitionof the sms suite)
set up of the experiments
Set-up ofthe experiments
  • KENDA cycle:
    • 3-hourly cycles, 24 hours
    • 20 members
    • BCsfrom ECMWF ENS (alsoICsforcold start)
    • no modelperturbations
    • observations: TEMP SYNOP AIREP
qv lev 40 41 3h
qvlev 40-41 +3h

NATURE RUN

CONTROL RUN

qv lev 40 41 6h
qvlev 40-41 +6h

NATURE RUN

CONTROL RUN

qv lev 40 41 12h
qvlev 40-41 +12h

NATURE RUN

CONTROL RUN

kenda cycle qv lev 40 41 3h
KENDA cycle-qvlev 40-41 +3h

BACKGROUND (lff)

ANALYSIS (laf)

MEAN

SPREAD

kenda cycle qv lev 40 41 6h
KENDA cycle - qvlev 40-41 +6h

BACKGROUND (lff)

ANALYSIS (laf)

MEAN

SPREAD

qv lev 40 41 6h1

NATURE RUN

KENDA ANALYSIS

qvlev 40-41 +6h

CONTROL RUN

kenda cycle qv lev 40 41 9h
KENDA cycle - qvlev 40-41 +9h

BACKGROUND (lff)

ANALYSIS (laf)

MEAN

SPREAD

kenda cycle qv lev 40 41 12h
KENDA cycle - qvlev 40-41 +12h

BACKGROUND (lff)

ANALYSIS (laf)

MEAN

SPREAD

qv lev 40 41 12h1

NATURE RUN

KENDA ANALYSIS

qvlev 40-41 +12h

CONTROL RUN

issues under investigation
Issues under investigation
  • “sufficient” spread isneeded in the OSSE ensemble
  • after the KENDA step:
    • the ensemble meaniscorrectlydriventowards the pseudo-observations
    • the ensemble spread isgreatlyreduced
  • pseudo-observationrejectedif the spread istoosmall
  • techincalissuestobesolvedrelatedtoqualitycontrolchecks(pseudo-observationsrejectedifthey are toodifferentfromthe background, whichmaybeneededforan OSSE)
  • furthertesting: localisation, multi-stepanalysis
  • suggestionsforthisOSSE are welcome!