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)

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

2. Coupling of Climate Local Model and Community Land Model Reto Stöckli, Sonia Seneviratne, ETH Zurich Community Land Model http://www.cgd.ucar.edu/tss/clm/ 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

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

Motivation Maximum LAI DWD ECOCLIMAP GKSS EFAI

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

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

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

Diff: ECOCLIMAP H Year T_2m Year E Year T_2m July

LAI30-Ref: yearly average H E E H

LAI30-Ref: May average H E

Area mean differences IBE (LAI30) SCA (LAI30)

Relative water content in LAI30 Level 1, June Level 1, October IBE SCA [%] [%] 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12

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

BK-Ref: July average H E

WL-Ref: yearly average H E QS QL

Diff: T2m yearly average LAI30 BK

Diff: T2m monthly average LAI30 May BK July

Uncertainty ranges T2m DTR Yearly average Monthly average

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