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NWP Strategy of DWD

Explore the evolution of DWD's NWP strategy from 2005-2010, featuring enhanced resolutions, data assimilation techniques, and model configurations to improve weather forecasting accuracy. Learn about the innovative ICON model joint development with Max-Planck-Institute for Meteorology and universities.

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NWP Strategy of DWD

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  1. 2005-2006 after 2006 NWP Strategy of DWD GF XY

  2. 2005-2006 • Global Forcast system GME • Resolution has been enhanced • Grid size 40 km • Levels: 40 km • Multi level soil model • Data Assimilation • Assimilation of radiances with 1d-Var end of 2005 • 3d-Var will replace OI end of 2006 • Observation space • flow dependent structure functions GF XY

  3. Layer configuration of the new 7-layer soil model GF XY

  4. 2005-2006 • Local Model Version LME • Extension of the model domain (covers Europe, Mediterranean Sea, Black Sea, North Sea, Baltic Sea) • Extension of the forecast range to 3 days • Operation will start on 28 September 2005 • 40 layers • Multi layer soil model • 1d-Var assimilation of satellite observations (COSMO priority pilot project) • use of European wind profilers GF XY

  5. LME: LM Europe • Model Configuration Grid spacing: 0.0625° (~ 7 km) 665 x 657 grid points per layer 40 vertical layers Timestep: 40 (72) sec Daily runs at 00, 12, 18 UTC, +78h • Boundary Conditions Interpolated GME forecasts with Δ ~ 40 km and 40 layers (hourly) Hydrostatic pressure at lateral boundaries • Data Assimilation Nudging analysis scheme Variational soil moisture analysis SST analysis at 00 UTC Snow depth analysis every 6 hrs Model domain of LME GF XY

  6. 2005-2006 • Local Model LMK (“Kürzestfrist” - very short range forecast) • Grid size 2.8 km • Goal: Simulation of the self organisation of deep convection • Goal: Prediction of severe weather on the mesoscale • Rapid update cycle • 8 forecasts per day • 18h forecast time • To be interpreted as a lagged average ensemble forecast system GF XY

  7. LMK: • x = 2.8 km • 421 * 461 Gitterpunkte • 50 Schichten • t = 30 sec. • Tges = 18 h GF XY

  8. LMK: A new 18-h forecast every three hours +18h +15h +12h +9h +6h +3h 00 03 06 09 12 15 18 21 00 (UTC) GF XY

  9. 2007-2010 • Computer resources • Extension of factor 10 of the performance in 2008 (request has not been approved by the German Government) • Ensemble Prediction System basing on LME and LMK GF XY

  10. 2007-2010 • New unified global and regional forecast model ICON • Global model – limited area model • Triangular grid • Local grid refinement • Compressible, conservation properties (mass, energy,...) • to be used for weather forecasting and climate modelling • joint development with Max-Planck-Institute for Meteorology and Universities • http://icon.enes.org GF XY

  11. ICON with a double nest covering Europe and Central Europe GF XY

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