Red - ECMWF Green - Sintex Navy - POAMA-2.0
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Transcript of Red - ECMWF Green - Sintex Navy - POAMA-2.0
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Red - ECMWF
Green - Sintex
Navy - POAMA-2.0
Anomaly Correlation
Standard Dev
Drift
NINO-3
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Red - ECMWF
Green - Sintex
Navy - POAMA-2.0
Anomaly Correlation Standard Dev
Drift
NINO-4
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Red - ECMWF
Green - Sintex
Navy - POAMA-2.0
Anomaly Correlation Standard Dev
IOD
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
OBS relationship between AU rainfall and the first two dominant EOF modes of SST
DJF MAM JJA SON
CC with PC1
CC with PC2
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Can POAMA predict “flavour” of El Nino?
1 month lead
5 month lead
9 month lead
EOF PC1 0.98 0.77 0.67
EOF PC2 0.93 0.65 0.54
SST EOF1 SST EOF2
Wang and Hendon (2007) showed that EOF2 important for Australian Rainfall
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
1997
OBS
2002
POAMA at
3 months lead
1997
2002
1997 vs 2002 SST forecasts
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
1997 SON POAMA lt 0
2002 SON POAMA lt 0
1997 SON Obs
2002 SON Obs
BUT•Skill disappears after first season
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
POAMA’s first two SST EOF modes (SON)
0.93 (pattern corr.) LT 0 0.80
0.88 LT 3 0.59
61% (explained var.) 12%
0.88 LT 6 0.61
OBS
POAMA54%
66%
12%
10%
71% 8%
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Corr between rainfall and PC1 in POAMA hindcasts at lead time 0 to 6 months (anticlockwise)
JJALT0
LT1
LT2 LT3 LT4
LT5
LT6
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Corr between rainfall and PC1 in POAMA hindcasts at lead time 0 to 6 months (anticlockwise)
SON
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
EA rainfall
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
DJF MAM JJA SON
Co
rr. C
oe
ff. LT0
LT1
LT3
LT6
EA Tmax
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
DJF MAM JJA SONC
orr
. Co
eff
. LT0
LT1
LT3
LT6
EA Tmin
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
DJF MAM JJA SON
Co
rr. C
oe
ff. LT0
LT1
LT3
LT6
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
SON Rainfall 1982-2006 from POAMA-1.5
POAMA vs ClimatologyNCC operational vs Climo POAMA vs NCC
Brier Skill Score percentage improvement
Forecast for first season
BUT•Skill disappears after first season
•Too emphatic ?
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Skill improvement of POAMA prediction from the current operational prediction for exceeding median rainfall (at lead time 0)
DJF MAM
(summer) (autumn)
JJA SON
(winter) (spring)
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Skill improvement of Multi-Model Ensemble prediction compared to POAMA only for rainfall (at lead time 0)
DJF MAM
(summer) (autumn)
JJA SON
(winter) (spring)
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Nino-4 Anomaly CorrelationNino-4 Anomaly Correlation
Red - Old systemRed - Old system
Navy - PEODASNavy - PEODAS
Blue - ECMWFBlue - ECMWF
Navy - PEODASNavy - PEODAS
Pink - No AssimPink - No Assim
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
West Pacific (Nino-4)West Pacific (Nino-4)
Why no significant improvement relative to No Assim (and behind ECWMF) in first few months?
Standard deviation of NINO4 anomalies with lead time
INITIALISATION SHOCK ?
Imbalanced initialisation or Model error ?
Probably model error
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
IOD Anomaly CorrelationIOD Anomaly Correlation
Red - Old systemRed - Old system
Navy - PEODASNavy - PEODAS
Blue - ECMWFBlue - ECMWF
Navy - PEODASNavy - PEODAS
Pink - No AssimPink - No Assim
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
IOD: Why no significant improvement and IOD: Why no significant improvement and behind ECWMF ?behind ECWMF ?
Due to Altimeter data ?Due to Altimeter data ?Correlation of surface U with OSCARCorrelation of surface U with OSCAR
(www.oscar.noaa.gov)(www.oscar.noaa.gov)
PEODAS ECMWFPEODAS ECMWF
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
IOD: Why no significant improvement and IOD: Why no significant improvement and behind ECWMF ?behind ECWMF ?
Or Due to Model error ?Or Due to Model error ?
STD of IOD Bias in IOD EastSTD of IOD Bias in IOD East
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Characteristics of simulated IOD in POAMA
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• The observed DMI peaks strongly in SON and is a minimum in Jan-Apr. The simulated
DMI in the forecast model exhibits a realistic seasonal variation but its maximum in SON is
too weak and it does not drop off as quickly in Dec-Jan as observed.
• Inspection of the annual variation of the amplitude of the Niño3.4 index indicates realistic
amplitude and seasonal variation (peak in Nov-Jan), suggesting that any errors in remote
forcing from ENSO do not stem from an erroneous depiction of the phase locking to the
seasonal cycle of El Niño development.
Obs
Lt1
Lt3
Lt6
Lt9
Seasonal cycle
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Red - ECMWF
Green - Sintex
Navy - POAMA-2.0
Standard Deviation
Drift
IOD-EAST
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Examples of poor central Pacific Forecasts
Red - ECMWF
Green - Sintex
Navy - POAMA-2.0
Light Blue - POAMA-1.5
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
SST 20C Depth Zonal Wind
Cold Bias - initialisation shock ?
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
Missed ENSO’s
Why?
Model problem
Predictability
Initialisation
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The Centre for Australian Weather and Climate Research A partnership between CSIRO and the Bureau of Meteorology
1997 El Nino