1. Community. Activities in. Soil and Vegetation. presented by A
Community Activities in Soil and Vegetation presented by A.Will (BTU Cottbus) and Aerosols and Clouds Swen Metzger (MPI Chemistry, Mainz)

2. 1. Implementation of soil-vegetation model VEG3D Cathérine Meißner and Gerd Schädler, University / Research Center Karlsruhe
VEG3D is fully coupled with CLM version 4.0 and is being evaluated
Main differences between TERRA_LM and VEG3D:
Standard soil model of CLM (TERRA_LM) uses the surface temperature for transpiration calculation <-> VEG3D has an explicit vegetation layer (“big leaf concept”) and simulates a vegetation temperature
Runoff from soil layers is organized differently in both models
Different formulation of water transport in soil and snow treatment
Additional parameters:
Land use => taken from the DWD Pep
Soil parameters => additional file in CLM code
First results:
Annual evapotranspiration sum more homogenous in VEG3D which agrees better with measurements (figures)
Influence on annual preciptation in the range of 100 – 200 mm
Was ist bei Simulationseinstellungen gemeint?
OBSERVATIONS TERRA_ML Veg3D mm

3. 2. Coupling of Climate Local Model and Community Land Model
Reto Stöckli, Sonia Seneviratne, ETH Zurich
Community Land Model
community model
used in Community Climate System Model (CCSM)
Modules:
Biogeophysics
River routing
Carbon cycle (plant physiology)
Vegetation dynamics
C/N model (nutrients)
Dust, VOCs

4. Uncertainties of input parameters and their impact on CLM simulations
Doctor Thesis of Alexander Block
Chair for Environmental Meteorology, BTU Cottbus
Presented by Andreas Will

5. Motivation
Maximum LAI
DWD
ECOCLIMAP
GKSS
EFAI

6. Simulations LAI30: Leaf area index (LAI-LAI*0.3)
LAIECO: Leaf area index (ECOCLIMAP)
PLCOV: Plant cover (ECOCLIMAP)
ROOTDP: Root depth (ECOCLIMAP)
ALBVEG: Vegetation Albedo (ECOCLIMAP)
WL: Thermal Conductivity dependent on water content
RS: Stomata resistance
BK: Soiltype parameters
GKSS: Plant cover, LAI, soiltype
ECO: Plant cover, LAI, vegetation Albedo, root depth

7. Model setup Version LM3.19 ERA40 boundary data 1 year (1987)
1/6°, 193x217 GP, 20 vertical levels
10 soil levels
dt=90s
LAN

8. Uncertainties
LAI30 WL
Uncertainty soiltype parameters (BK): +/- 20%

9. Diff: ECOCLIMAP H
Year
T_2m
Year E
Year
T_2m
July

10. LAI30-Ref: yearly averageH E E H

11. LAI30-Ref: May average H E

12. Area mean differences
IBE (LAI30)
SCA (LAI30)

13. Relative water content in LAI30
Level 1, June
Level 1, October
IBE
SCA
[%]
[%]

14. Evapotranspiration in Scandinavia
wl,root – water content of rooting zone
evaporation and transpiration counterbalance each other at soil water contents above 50%

15. BK-Ref: July average H E

16. WL-Ref: yearly averageH E QS QL

17. Diff: T2m yearly average
LAI30 BK

18. Diff: T2m monthly average
LAI30
May BK
July

19. Uncertainty ranges
T2m
DTR
Yearly average
Monthly average

20. Percentage of uncertainty range on absolute value
Uncertainty ranges
Latent heat flux, Year
Latent heat flux, June
Percentage of uncertainty range on absolute value