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DEMETER D evelopment of a E uropean M ulti-model E nsemble System for Seasonal to In ter annual Prediction. Tim Palmer Renate Hagedorn Francisco Doblas-Reyes. Outline. Hindcast production Summary of all models Estimate of ERA-40 production. • Verification - PowerPoint PPT Presentation
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PROMISE meeting Paris 13/14 May 2002
DEMETER
Development of a European
Multi-model Ensemble System for
Seasonal to Interannual Prediction
Tim PalmerRenate HagedornFrancisco Doblas-Reyes
PROMISE meeting Paris 13/14 May 2002
Outline
• Verification
Automatic diagnostics on web
First multi-model results
• Hindcast production
Summary of all models
Estimate of ERA-40 production
PROMISE meeting Paris 13/14 May 2002
DEMETER
ERA40
Hindcast production
Multi-model
assessment
Hindcast verificatio
n
End users, application
s
Downscaling
EU and WMO
programmes
PROMISE meeting Paris 13/14 May 2002
DEMETER: Hindcast productionCountry Atmosphere Ocean
Int ECMWF HOPE
France ECMWF OPA
France ARPEGE OPA
Italy ECHAM OPA
Germany ECHAM HOPE
UK UM UM
• Main focus: 1987-1998 (1969-1986)
• 9 member ensembles, 6 month hindcasts, 4 hindcasts per year
ERA-40 initial conditions
SST and wind perturbations
09/86
ERA40 fluxes
11/86
Ocean model integration
(strong relaxation to observed SSTs)
No WP- SST Pert
+ SST Pert
+ WP
- WP
No SST Pert
+ SST Pert- SST Pert
PROMISE meeting Paris 13/14 May 2002
DEMETER: Hindcast production
LODYC: 10*4 + 1 = 41 hindcasts
ERA-40: 10 years and 7 months
ECMWF: 10*4 + 2 = 42 hindcasts
09/86 04/9711/86 02/9702/95
UKMO: 9*4 + 2 = 38 hindcasts
CNRM: 8*4 + 2 = 34 hindcasts
MPI: 6*4 + 1 = 25 hc
02/9611/92
PROMISE meeting Paris 13/14 May 2002
Estimate of ERA-40 ProductionStream 2 Stream 3 Stream 1
PROMISE meeting Paris 13/14 May 2002
Verification System
www.ecmwf.int/research/demeter/verification
• Bias• Indices• Deterministic Scores• Probabilistic Scores• Single vs. multi-model results
PROMISE meeting Paris 13/14 May 2002
Bias
PROMISE meeting Paris 13/14 May 2002
Value
PROMISE meeting Paris 13/14 May 2002
Anomaly Correlation Coefficient
PROMISE meeting Paris 13/14 May 2002
Multi-model DEMETER hindcasts
ACC for Niño3 SST for Multimodel, ECMWF, MetFr, MetOf, and LODYC
PROMISE meeting Paris 13/14 May 2002
Multi-model DEMETER hindcasts
SST
Tropical RPSS (JJA) for Multimodel, ECMWF, MetFr, MetOf, and LODYC
Precipitation
PROMISE meeting Paris 13/14 May 2002
Multi-model DEMETER hindcasts
SST
Value (Tropics, JJA) for Multimodel, ECMWF, MetFr, MetOf, and LODYC
Precipitation
Anom>
Anom>0
Anom>
Anom>0
PROMISE meeting Paris 13/14 May 2002
Summary
• 5 DEMETER models are archiving into MARS
Hindcasts from 1987 – 1996 are available
Full DEMETER data set (1969-1998) not available
before end of 2003
free (!) online (!) data retrieval very likely to be
installed and working at the end of 2002• Wide range of diagnostic plots freely accessible on the
DEMETER web site: www.ecmwf.int/research/verification• First results demonstrate value of multi-model approach