Poster Presentation

Poster Presentation Working Group 3: Physical Aspects

Poster titles … • Matteo Buzzi: Performance of the single column aLMo turbulence scheme for a stably stratified atmospheric boundary layer: the first GABLS case • Thorsten Reinhardt: A prognostic graupel microphysics scheme for high-resolution NWP • Silke Dierer: Evaluation of the Kain-Fritsch/Bechtold convection scheme • Alessio Bozzo: Comparison of LM fast radiation scheme to RTX LbL model: cloudy processes • Gerd Vogel: The impact of surface forcing on diurnal boundary layer development • Andreas Will: The LM climate mode (CLM) and the behavior of the soil model TERRA_ML • Felix Ament: High resolution soil moisture analysis by assimilation of observations in LM-TERRA

Performance of the single column aLMo turbulence scheme for a stably stratified atmospheric boundary layer: the first GABLS case Matteo Buzzi and Mathias W. Rotach, MeteoSwiss

Sensitivity Tests Regarding Assumed Graupel Particle Properties Motivation Gilmore et al (MWR 2004) found high sensitivity to assumed graupel/hail particle properties in simulations of idealized convection. Can in LMK graupel particle properties changed to more hail-like properties help to reduce problem of underestimation of convection? Conclusion • In LMK simulations of idealized strong convection simulated precipitation can be highly sensitive to the assumed graupel particle properties. • This sensitivity was much weaker in simulations of real weather situations. • Changing graupel properties toward those of more hail-like properties does not cure problem of underestimated convection in LMK. • Therefore a change in the parameterization of the graupel category in the microphysics scheme was not introduced.

Evaluation of the Kain-Fritsch/Bechtold convection scheme (Dierer & Schubiger) all 800m – 1500m black: operational; red: Kain-Fritsch/Bechtold < 800m > 1500m

SW Heating rate IWC=0.03 g/m3 Solar parameterization of ice particles works fine! Heating rates for the 3 habits and LM are in exceptional agreement along all the troposphere for all the analyzed standard atmospheres Aggregates and columns show slightly more extinction inside the cloud

Soil moisture: LME vs. measurements (Falkenberg)

W_so Initialisation saturation + annual cycle T_so – Initialisation phase relation + annual cycle Underestimation of Latent Heat ROOT_DEPTH, VEG3D Únderestimated Variance of T_so W_so-dependent heat cond. λ Constant T at the Lower Boundary ZMAX dependent on TEND zero flux Adjustment of Gravitational Flow and Run-off process analysis and Limitation of Soil Heat Flux further evaluation } } } ,,Open Questions’’ and ,,Work in Progress’’ Introduction Model Results Work in Progress

MSMA (Measurement driven soil moisture analysis) Result Problem Possible Solution • Accurate soil moisture analysis with good representation of rain induced effect, if • forcing data is of high quality • model physic has no deficiencies No observation available at scale of interest! “Use a good soil module and force it with observations!” Satellite Surface OBS 100km Radar Satellite 10km Meteorological Forcing: T, p, u, q, Qdown NWP Precipitation RR Observational gap 1km SVAT „TERRA“ 100m • Simulation of • Energy balance • Soil processes • Annual cycle of vegetation 10m 1m time (TERRA two layer, Lindenberg, 2003) In situ

Poster Presentation