1. New results of stand-alone simulations with the TERRA module
G. Vogel and J. Helmert
Deutscher Wetterdienst

2. Improvements of Bowen ratio
Bondville/USA
Options:
Bare soil evap (BS)
Depletion of rooting densitiy with depth (RD)
Rigid lid (RL)
Enlarged infiltr (eINF)
Satbsd LAI+plcov (SAT)
Satbsd LAI+plcov with modifications (SATm)
vs.
Standard version
Tongyu/China
Lindenberg/Ger

3. Bondville/USA 2003
Cropland (corn)
snow, fully humid, hot summer (Dfa)

4. Bondville/USA 2004 Cropland (soy beans)
snow, fully humid, hot summer (Dfa)

5. Current options (RL+RD+BS+SAT) vs. Standard code (reference)
Falkenberg
2003
2007

6. Falkenberg 2007 Improvement due to enabled ground-water exchange
Further improvement possible due to enlarged infiltration
Dx74
Dx26
New set (GW+RD+BS +SAT) vs. former options (RL+RD+BS+SAT)
New set with enlarged infiltration rate vs. new set of options

7. Increased performance of Bowen ratio
Standard code Current set of options (RL, RD, BS, SAT) New set of options (GW+RD+BS+SAT+ eINF)

8. Falkenberg March -April 2009 0-1cm
Soil moisture (Falkenberg)
Falkenberg
0-1cm
Experimental runs A2 (6795) without SMA A3 (7004) with SMA
vs.
operational COSMO-EU
3-9cm
March -April 2009
9-27cm

9. Experimental run with the options GW + RD + BS vs. operat. run
Impact on boundary layer processes in the daily cycle
March 2009

10. April 2009 (Falkenberg)
Precipitation
Soil moisture
9-27cm
27-81cm

11. Experimental run with the options GW + RD + BS vs. operat. run
Impact on turbulent fluxes and temperature
2009,17-27 April Falkenberg

12. Conclusions
The performance of the TERRA module can be improved if the bare soil evaporation, the water withdraw from soil by the vegetation and the wa- ter transfer at the lower hydrological boundary are modified.
Besides a realistic ratio of the turbulent fluxes, their accurate amounts are likewise important to achieve a realistic soil water content in the an- nual cycle as well.
Both experimental model runs (with SMA/ without SMA) should be con-tinued to estimate the chosen options more reliably. To consolidate the findings similar validation studies are recommended at other boundary layer sites with different local conditions.

14. warm temperate, fully humid, warm summer (Cfb)
Lindenberg/D
Bondville/USA
Tongyu/China
812 mm/a
2003
375 mm/a
2003
312 mm/a
2003
snow, fully humid, hot summer (Dfa)
warm temperate, fully humid, warm summer (Cfb)
snow, winter dry, hot summer (Dwa)

15. Improvements of Bowen ratio
Bondville/USA
Options:
Bare soil evap (BS)
Root depletion with depth (RD)
Rigid lid (RL)
Enlarged infiltr (eINF)
Satbsd LAI+plcov (SAT)
Satbsd LAI+plcov with modif (SATm)
vs.
Standard version
Tongyu/China
Lindenberg/Ger

16. 2007
2003

17. Falkenberg March -April 2009
Experimental runs A2 (6795) without SMA A3 (7004) with SMA
vs.
operational COSMO-EU
March -April 2009

18. Experimental with the options GWc + RD + BS vs. operational run
Impact on evapotransporation and 10m specific humidity
March 2009

20. April 2009 (Falkenberg)
3-9cm
Soil moisture
9-27cm
27-81cm

21. Experimental run with the options GW + RD + BS vs. operat. run
Impact on sensible and latent heat fluxes at surface
April, 1-27
April, 17-27

22. Experimental run with the options GW + RD + BS vs. operat. run
Impact on sensible and latent heat fluxes at surface
April, 1-27
April, 17-27

23. Experimental run with the options GW + RD + BS vs. operat. run
Impact on temperature

25. Experimental run with the options GW + RD + BS vs. operat. run
Impact on sensible and latent heat fluxes at surface
April 2009

26. Experimental run with the options GW + RD + BS vs. operat. run
Impact on sensible and latent heat fluxes at surface
April, 1-27
April, 17-27

27. Experimental run with the options GW + RD + BS vs. operat. run
Impact on temperature
April, 1-27
April, 17-27

28. Experimental run with the options GW + RD + BS vs. operat. run
Impact on turbulent fluxes and temperature
2009,17-27 April Falkenberg