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New results of stand-alone simulations with the TERRA module
G. Vogel and J. Helmert Deutscher Wetterdienst
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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
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Bondville/USA 2003 Cropland (corn) snow, fully humid, hot summer (Dfa)
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Bondville/USA 2004 Cropland (soy beans)
snow, fully humid, hot summer (Dfa)
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Current options (RL+RD+BS+SAT) vs. Standard code (reference)
Falkenberg 2003 2007
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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
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Increased performance of Bowen ratio
Standard code Current set of options (RL, RD, BS, SAT) New set of options (GW+RD+BS+SAT+ eINF)
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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
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Experimental run with the options GW + RD + BS vs. operat. run
Impact on boundary layer processes in the daily cycle March 2009
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April 2009 (Falkenberg) Precipitation Soil moisture 9-27cm 27-81cm
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Experimental run with the options GW + RD + BS vs. operat. run
Impact on turbulent fluxes and temperature 2009,17-27 April Falkenberg
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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.
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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)
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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
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2007 2003
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Falkenberg March -April 2009
Experimental runs A2 (6795) without SMA A3 (7004) with SMA vs. operational COSMO-EU March -April 2009
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Experimental with the options GWc + RD + BS vs. operational run
Impact on evapotransporation and 10m specific humidity March 2009
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April 2009 (Falkenberg) 3-9cm Soil moisture 9-27cm 27-81cm
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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
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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
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Experimental run with the options GW + RD + BS vs. operat. run
Impact on temperature
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Experimental run with the options GW + RD + BS vs. operat. run
Impact on sensible and latent heat fluxes at surface April 2009
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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
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Experimental run with the options GW + RD + BS vs. operat. run
Impact on temperature April, 1-27 April, 17-27
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Experimental run with the options GW + RD + BS vs. operat. run
Impact on turbulent fluxes and temperature 2009,17-27 April Falkenberg
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