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Operational and research activities at ECMWF now and in the future

Operational and research activities at ECMWF now and in the future. Sarah Keeley Education Officer Erland Källén Director of Research. ECMWF An independent intergovernmental organisation established in 1975 Currently: 20 Member States 14 Co -operating States. How ECMWF was established.

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Operational and research activities at ECMWF now and in the future

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  1. Operational and research activities at ECMWF now and in the future Sarah Keeley Education Officer ErlandKällén Director of Research

  2. ECMWF An independent intergovernmental organisation established in 1975 Currently: 20 Member States 14 Co-operating States

  3. How ECMWF was established • Start of operational activities • 1978 Installation of first computer system (CRAY 1-A) • Start of operations • N48 grid point model – 200km

  4. Current system • IBM Cluster • Two identical systems for resiliency • 1.5 Petaflops peak performance (1.5×1015) • Operational Model - T1279 (16km) • Ensemble Prediction System - T639 (31km)

  5. Increasing Resolution ~25km ~125km ~63km ~39km

  6. Evolution of ECMWF scores ~16km ~210km Adapted and extended from Simmons & Hollingsworth (2002)

  7. Physical aspects, included in IFS

  8. Data assimilation

  9. Predictability, diagnostics and extended-range forecasting The atmosphere is a chaotic system • Small errors can grow to have major impact (butterfly effect) • This limits detailed weather prediction to a week or so ahead • Slowly evolving components of the climate system can give predictability at longer timescales

  10. Meteorological Operations

  11. ECMWFResearch Erland Källén Director of Research ECMWF

  12. Outline • Operational scores • Data assimilation • Clouds and surface processes • Forecast busts • Increasing resolution • Ocean wave prediction • Reanalysis • Chemical modelling and assimilation

  13. Quality of 500 hPa forecasts at day 6 Error reduction ↑ ECMWF NCEP ERA reforecasts UKMO

  14. Model: Physical aspects • Cloud microphysics • Convection scheme revisions • Stable boundary layer – roughness lengths • Radiation and aerosols

  15. Focus on improved cloud parametrization: • Super-cooled liquid layers in mixed phase stratiform cloud (37r3) • Ice water content in cirrus (38r1) • Reduction of drizzle occurrence ice liquid cirrus anvil cirrus frontal mid-level cloud deep convection shallow Cu SLW stratus stratocumulus Freezing level

  16. Diagnostics • Forecast busts • Severe weather • EDA, ENS and model error

  17. Forecast busts over Europe D+6 RMSE > 60m ACC < 0.40

  18. Flow anomaly before forecast bust over Europe

  19. CAPE anomaly before forecast bust over Europe

  20. Model: Numerical aspects • Resolution increases • Horizontal: 16 km in 2010 →10 km in 2015 → ≈5 km in 2020 • Vertical: 91 → 137 levels in 2013 • Fast Legendre transforms • Non-hydrostatic model • Mass conservation

  21. Surface winds from Lothar storm 26 Dec 1999(11 hour forecast) T7999 (2.5 km) T1279 (16 km) Gust speed

  22. ENsemble prediction System (ENS) • EDA, singular vectors and ENS • Stochastic physics • Monthly forecasting • MJO skill scores • Seasonal forecast System 4 • EUROSIP including NCEP • Applications of ENS • Flooding/drought prediction • Health

  23. Performance of the monthly Forecasts since 2002 Hindcasts covering the period 1995-2001 Tropics N. Extratropics Day 12-18 ERA 2011 2002

  24. Data assimilation • Variational assimilation • Ensemble of Data Assimilations (EDA) • Ensemble Kalman Filter (EnKF) • Surface analysis

  25. Reanalysis (ERA) • Climate monitoring in near real time • ERA-20th century reanalysis in preparation • Ocean reanalysis

  26. ERA-20CM consistency with ERA-Interim

  27. Time evolution of ocean heat content

  28. Atmospheric composition • Modelling and data assimilation • Monitoring and evaluation • Impact on NWP – aerosols

  29. Summary • ECMWF world leader medium range weather forecasting • Variational and ensemble data assimilation • Very high resolution possible • Ocean surface wave modelling • Atmospheric composition • Reanalysis

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