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Development of a European Land Data Assimilation System (ELDAS)

Development of a European Land Data Assimilation System (ELDAS). Combined Research/Demonstration project EU 5th framework. Motivation. Pilot study, to combine ( European ) expertise on soil moisture assimilation Provide a European contribution to GLDAS research

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Development of a European Land Data Assimilation System (ELDAS)

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  1. Development of a European Land Data Assimilation System (ELDAS) Combined Research/Demonstration project EU 5th framework

  2. Motivation • Pilot study, to combine (European) expertise on soil moisture assimilation • Provide a European contribution to GLDAS research • Prepare/apply use of satellite data for soil moisture assimilation • MSG: thermal/visible • SMOS: microwave

  3. Partners KNMI Alterra Wageningen Univ Bonn DWD/GPCC CNRM SMHI CEH Wallingford ECMWF Vienna Univ INM Madrid Plus User Advisory Board

  4. Design of assimilation system evaporation Boundary layer scheme Observations driving soil moisture correction METEOSAT or MSG Synops data precipitation radiation Soil moisture content Land surface parameterization scheme Soil moisture correction scheme (sub)surface runoff

  5. Observations: precipitation Raw radar data

  6. Observations: precipitation Corrected radar data

  7. Observations: precipitation Interpolation to ELDAS grid

  8. Observations: precipitation Blend with gauge data

  9. ELDORADO LW & SW Radiation • Simple data assimilation of METEOSAT TOA products in NWP RT model • Verified against BSRN & local SW networks

  10. Impact of forcings T Td Loobos, NL

  11. Trial assimilation of surface heating rates (Murex) Days when SHR is available (50% data missing, 25% cloudy) Soil moisture • +observations • -- control • - only SHR assimilated • - only T & RH assimilated • - all assimilated

  12. Assimilation of -wave data (SGP97) T & RH All data Tb only

  13. Validation sites

  14. Validation sites

  15. 20yr ‘PILPS’-climatology • (driven by ERA40) • 15mnth CTL with obs P & R • 15mnth DA with obs P & R Validation sites

  16. Effect of data assimilation Accumulated increment Change of soil water Change of runoff One  of dW Change of evaporation

  17. …and for various classes Mediterranean Classic Frozen ground Irrigation (?)

  18. Use of increments to change evaporation Mediterranean Classic Irrigation Frozen ground

  19. (Atmospheric) constraint of evaporation Mediterranean Classic Precipitation Runoff Storage Evaporation Frozen ground Irrigation (?)

  20. Dealing with increments in ERA40 hydrological budget analysis • Subtract I from runoff • If runoff < 0, compensate with dW

  21. Dealing with increments in ERA40 hydrological budget analysis • Subtract I from runoff • If runoff < 0, compensate with dW

  22. Wrap up • Infrastructural developments are involved • Demo & Validation in progress • Analysis of analyses: fairly inefficient in terms of changing evaporation • Calls for adjustment of E/W instead of W

  23. Final Workshop • 8-11 nov 2004 • ECMWF, Reading

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