Structure of the general part Introduction about the importance of the water cycle. Heritage of AQUA-Radar b) The role of ice in affecting the rain processes/solid precipitation (interest is shifting towards the mid-latitudes) c) Goals of the project/Key scientific questions d) Methodology of the proposed project to achieve such goals: Need of an integrated approach ground-based measurements (multi-sensor radar-driven strategy/ upgrade of Zugspitze-Lindenberg/ exploitation of existing systems ). .Other measuremenent sites Lichtneau/Bonn/DWD 2. laboratory experiments 3. numerical simulations e) Expected results Groups description f) Home-page f) Cui prodest

Goals/Scientific questions The primary scientific objectives are: To enhance our understanding of the microphysical and electromagnetic/radiative properties of precipitation-feeding ice clouds. To develop novel multi-sensor remote sensing and in-situ techniques for probing turbulent Systems of Hydrometeors To identify key microphysical numerical simulations parameters in the ice-phase (e.g. aggregation rate, turbulence, collection efficiency of cloud water by snow, crystal type) affecting the DSDs and leading to different precipitation modes and seasonal regimes To assess/quantify the effect of turbulence and electric fields on raindrops To initialize and collect datasets to evaluate cloud resolving models by identifying biases within them and guiding needed adjustments to their ice physics and parameters to mitigate those biases To improve quantitative precipitation estimates/forecasts and warning systems (e.g. presence of hail, snow, wet-snow) based on the (DWD) radar observation network To establish ground-based observatories (Lindenberg/Zugspitze) which can significantly contribute to the ground physical validation program of the up-coming space Precipitation Measuring Missions.

Long/short Expectations X-C bands polarimetric variables (LDR, ZDR, rhoHV) ice crystals modelling  hydrometeor classification schemes Dual-wavelength (X-Ka band) methodology validation VPR evaporation correction algorithm for polarimetric radars Improved techniques for supercooled liquid water detection and the the Hallet and Mossop effect Parametrizations of ice crystals/melting hydrometeros axial ratios Raindrops axial ratio in presence of turbulence/electric fields Evaluation of the turbulence effect on orientation distribution of ice crystals Melting hydrometeor electromagnetic modelling validation in the 10-36 GHz region Modelling of spectral radar observables/nonlinear least squares retrieval algorithms to fit the modeled spectral radar observables to spectral multifrequency radar measurements Linking turbulence and atmospheric profiling structure to precipitation modes Shedding effect as part of precipitation

PRoperties and Effects of Water and Ice in CLouds and precIPitation (PREWICLIP) Mixed-phase clouds : Composition, effects and dynamical structure comp: polarimetric measurem. DLR,DWD, Col,HAMBURG effects : attenuation, Col, Bn dyn.struct.: cloud modelling, Khe/other (see QUEST) The Bright Band and its environment: Properties and processes prop: HH, Bn Proc: Khe/other/Mainz Investigations of basic processes as related to data interpretation and to precip dynamics Mz and Stutt/Khe Turbulence (??)

Cui prodest? GPM mission= golden era of the microwave precipitation remote sensing (launch expected in 2013)‏  PMM Science Team for the Ground Validation (Bonn)  interest Letter by A. Hou Polarimetric up-grade of the whole C-band DWD radar network (3-5 years)  direct involvement of DWD‏ HALO airplane (direct involvement of MPI Hamburg) COSMO community IPWG Aerosol Cloud Ecosystem mission (long term)