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What can we learn about LSM’s from the ELDAS increments?

What can we learn about LSM’s from the ELDAS increments?. Bart vd Hurk, Janneke Ettema & Pedro Viterbo. A bit about ELDAS. Soil moisture assimilation ‘the European way’ (corrections using atm RH & T) Observed precipitation and radiation 15 month pilot study Oct 1999 – Dec 2000.

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What can we learn about LSM’s from the ELDAS increments?

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  1. What can we learn about LSM’s from the ELDAS increments? Bart vd Hurk, Janneke Ettema & Pedro Viterbo

  2. A bit about ELDAS • Soil moisture assimilation ‘the European way’ (corrections using atm RH & T) • Observed precipitation and radiation • 15 month pilot study • Oct 1999 – Dec 2000

  3. 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

  4. Validation sites

  5. Validation sites

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

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

  8. A few examples

  9. Ratio increment / (WS) Apr – Oct 2000

  10. Partitioning of increments Apr – Oct 2000 Evaporation Runoff Storage

  11. Partitioning of increments Apr – Jul 2000 Evaporation Runoff Storage

  12. 35 34 8 7 36 10 4 9 3 6 5 1 2 Ranking of E/I • Nrs in order of rank E/I • First 10 are found in Mediterranean and Estonia

  13. Limited response of E Precipitation Runoff Storage Evaporation

  14. Evaporation 1 Apr – 1 Oct

  15. Conclusions • For many locations increments exceed interannual variability of WS • For many non-Mediterranean points only a small portion of increments is returned into atmosphere • Limited response of E in offline runs • DA gives better evaporation for a few points, but generally only small effect compared to mean bias

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