mpact of the soil-vegetation model on CLM simulations
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1 mpact of the soil-vegetation model on CLM simulations C.Meißner, G. Schädler, C. Kottmeier, M. Haller Universität / Forschungszentrum Karlsruhe
2 Motivation rformance of long term simulations with CLM on regional scale nd-atmosphere feedback becomes very important on that scale vestigation of the influence of soil - vegetation model on PBL (ne rface conditions, convection) mparison of simulations with the TERRA_LM and the VEG3D fr e KAMM model
3 Why use the VEG3D? Explicit modelling of vegetation layer (big leaf concept) => Better simulation of e. g. temperature and humidity over hig vegetation expected reliable long term behaviour shown in different simulations.07 m obs.07 m sim.15 m obs.15 m sim.31 m obs.31 m sim Prec SWC (m³/m³) Prec (mm) days after
4 Differences between the two models Vegetation 3D has a vegetation temperature RA_LM uses the surface temperature for spiration calculation rent calculation of transfer coefficients for t and moisture in both models Water Transport Different formulations of hydraulic conduc and hydraulic diffusivity VEG3D: Van Genuchten TERRA_LM: Rijtema Reduction of water transport by ice in both models in different ways Runoff from soil layers Snow Snow temperature coupling with radiation more complex in VEG3D Both models calculate prognostic snow density and snow albedo aging with very different equations
5 finished in der Helmholtz-Gemeinschaft in work Model comparison and-alone-version to compare long term behaviour Data from different stations: Reklip (grassland) LOTREX-10E Field Experiment Hildesheimer Börde (wheat) Freiburg (forest) mulations and comparison with observations of the CLM for uthwest Germany Normal radiation days days with convection snow days ng term simulations with the CLM for several years
6 Comparison stand-alone-version test version of soil model TERRA_LM is used me values for vegetation parameters like e.g. leaf area index, p ver me soil type in both models where possible easurement site at wheat field in Hildesheimer Börde (LOTREX mmer 1989 il type VEG3D : silt loam TERRA_LM : clay loam easured water content is an average over 20 cm
7 Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Temperature in 3 cm VEG3D measurement TERRA_LM TERRA_LM too warm during dry periods
8 Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Temperature 15 cm VEG3D Temperature 60 cm measurement TERRA_LM
9 Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft Water content 0 20 cm VEG3D Water content cm measurement TERRA_LM
10 Forschungszentrum Karlsruhe in der Helmholtz-Gemeinschaft sensible heat flux latent heat flux VEG3D TERRA_LM Both models are very sensitive to changes in plant characteristics
11 Comparison of CLM simulations for south west Germany ulations with CLM for a day with normal radiation ( ) id resolution 7km g3d land use data from GLCC data set Veg3d has only 14 land use classes il type in Veg3d and Terra_LM is the same Possibility to use different soil types within a soil column in Veg3d (soil horizons from Hydrologischer Atlas Deutschland )
12 VEG3D TERRA_LM
13 VEG3D TERRA_LM
14 Lower sensible heat flux over forest in TERRA_LM VEG3D TERRA_LM
15 Higher latent heat flux over forest in TERRA_LM VEG3D TERRA_LM
16 Conclusions pected different behaviour of both soil-vegetation models o gh vegetation can be seen in stand alone version and CLM ulation rther simulations have to be conducted Stand alone comparison for other land use classes (e.g. fore Comparison for snow and freezing periods long term simulations (waiting for new LM / CLM model vers
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