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ECMWF Seattle, 6-7 June 2005 slide 1 The role of the Pacific downstream: Europe Value of Targeting Carla Cardinali Roberto Buizza Graeme Kelly Jean-Noel Thepaut
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ECMWF Seattle, 6-7 June 2005 slide 2 The role of the North Pacific sea for the downstream forecast has been investigated by removing all observations over sea 1.5 month assimilation ECMWF 4D-Var T511T159L60 Compare with O-suite Targeting studies (March 2005-…) Preliminary results Value of SVs to detect targeting areas Ultimately, value of targeting with satellite data Outline
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ECMWF Seattle, 6-7 June 2005 slide 3 Experiment Description: North Pacific OUT Synop Airep Satob DribuTemp Pilot Satellite Scatt
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ECMWF Seattle, 6-7 June 2005 slide 4 The Role of the Pacific
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ECMWF Seattle, 6-7 June 2005 slide 5 The Role of the Pacific
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ECMWF Seattle, 6-7 June 2005 slide 6 The Role of the Pacific
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ECMWF Seattle, 6-7 June 2005 slide 7 PACIFIC: NoPac forecast error – Oper forecast error at T+24 NormDiff in RMS Averaged over 50 cases
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ECMWF Seattle, 6-7 June 2005 slide 8 PACIFIC: NoPac forecast error – Oper forecast error at T+48 NormDiff in RMS Averaged over 50 cases
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ECMWF Seattle, 6-7 June 2005 slide 9 PACIFIC: NoPac forecast error – Oper forecast error at T+72 NormDiff in RMS Averaged over 50 cases
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ECMWF Seattle, 6-7 June 2005 slide 10 PACIFIC: NoPac forecast error – Oper forecast error at T+96 NormDiff in RMS Averaged over 50 cases
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ECMWF Seattle, 6-7 June 2005 slide 11 PACIFIC: NoPac forecast error – Oper forecast error at T+120 NormDiff in RMS Averaged over 50 cases
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ECMWF Seattle, 6-7 June 2005 slide 12 PACIFIC: NoPac forecast error – Oper forecast error at T+144 NormDiff in RMS Averaged over 50 cases
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ECMWF Seattle, 6-7 June 2005 slide 13 Removing all the observation over the North Pacific slightly deteriorate the day 6-7 forecast over Europe 1.5 month assimilation ECMWF 4D-Var T511T159L60 Compare with O-suite Observations over North America recover the lack over the Pacific: the impact depends on the synoptic situation See THORPEX picture Preliminary Conclusion
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ECMWF Seattle, 6-7 June 2005 slide 14
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ECMWF Seattle, 6-7 June 2005 slide 15 Targeting studies The key questions addressed in this study are: Q1 - What is the value of observations taken in target areas over the ocean, and what is the ‘value’ of SVs at depicting target areas? Q2 - Is the ‘value’ of observation regional dependent? (in other words, what is the value of observations taken over the Pacific for North-America, and the value of observations taken over the Atlantic for Europe?) Q3 - What is the ‘value’ of different types of observations? In particular, what is the scope of targeted satellite observations
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ECMWF Seattle, 6-7 June 2005 slide 16 1) Experiment Description: IN SV RD V 10 ToT Energy SVs T63L40 computed every analysis cycle for 1.5 month Verification region V and area where SVs have maximum final-time total energy after 48h. IN = All Points over Sea removed but in SV and RD Target-Areas Grid Points = 120
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ECMWF Seattle, 6-7 June 2005 slide 17 2) Experiment Description: OUT 10 ToT Energy SVs T63L40 computed every analysis cycle for 1.5 month OUT = All Points Removed in SV and RD Target-Areas Point left = 929
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ECMWF Seattle, 6-7 June 2005 slide 18 Experiment Description: Data Coverage Pacific OUT SVIN RDIN
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ECMWF Seattle, 6-7 June 2005 slide 19 Target IN
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ECMWF Seattle, 6-7 June 2005 slide 20 Target OUT
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ECMWF Seattle, 6-7 June 2005 slide 21 Target IN Target OUT
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ECMWF Seattle, 6-7 June 2005 slide 22 PACIFIC: SVIN forecast error – RDIN forecast error at T+24 NormDiff in RMS Averaged over 50 cases
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ECMWF Seattle, 6-7 June 2005 slide 23 PACIFIC: SVIN forecast error – RDIN forecast error at T+48 NormDiff in RMS Averaged over 50 cases
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ECMWF Seattle, 6-7 June 2005 slide 24 PACIFIC: SVIN forecast error – RDIN forecast error at T+72 NormDiff in RMS Averaged over 50 cases
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ECMWF Seattle, 6-7 June 2005 slide 25 PACIFIC: SVIN forecast error – RDIN forecast error at T+96 NormDiff in RMS Averaged over 50 cases
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ECMWF Seattle, 6-7 June 2005 slide 26 PACIFIC: SVIN forecast error – RDIN forecast error at T+120 NormDiff in RMS Averaged over 50 cases
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ECMWF Seattle, 6-7 June 2005 slide 27 PACIFIC: SVIN forecast error – RDIN forecast error at T+144 NormDiff in RMS Averaged over 50 cases
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ECMWF Seattle, 6-7 June 2005 slide 28 Key preliminary conclusions (based on ~1.5 months) Q1 - The value of observations taken in target areas over the ocean depends strongly on the underlying observations. If the underlying system has no-observations over the ocean, than observations taken in target areas are valuable, and observations taken in SV target areas are more valuable than observations taken in Random areas If the underlying system has observations over the ocean, than removing observations from SV or Random areas has smaller value Q2 - The value is regional dependent: the value of observations taken in the Pacific for North America is higher than the value of observations taken in the Atlantic for Europe Q3 – No conclusions yet on this point (if results are symmetrical, little scope to target with satellite observations).
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ECMWF Seattle, 6-7 June 2005 slide 29 Value of Targeting the Pacific for Europe
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