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Changes in frequency, duration and/or intensity of extreme precipitation events, such as heavy precipitation or drought, profoundly impact both society and the natural environment. Regional climate models are valuable tools to assess any future progress of such events, and to complement the development of regional and local adaptation and mitigation strategies -here for the model region Dresden within the REGKLAM project. Multi-model approaches may alleviate some of the problems related to uncertainties of projected changes.The bandwidth of future climate conditions in Central Eastern Germany has been estimated, using 12 regional climate projections in daily resolution as simulated within the EU-project ENSEMBLES (emission scenario A1B). Validation of the model runs against an observation data set displayed significant difficulties of the models to describe the regional precipitation characteristics. Shortcomings are particularly obvious in realistically simulating dry period characteristics, likely due to an overestimation of precipitation totals. Most models agree in the projection of more frequent and longer-lasting drought events during summer, while wet phase frequency and persistence is projected to increase in winter. Extreme precipitation events (99th percentile) are likely to increase by the end of the 21st century in most seasons -even in summer, despite projected decreasing average precipitation.The suggested display of all individual model results allows comparing the characteristics and the trend behaviour of the individual regional climate projections. This supports selecting the suitable model(s) for specific impact modelling demands.

Abstract. current and future climate conditions and their impact on water balance, ecosystems, air quality and bioand agro-climatology were investigated in the region of the lusatian neisse within the two eu-projects -neyMO and klaPS. This work focuses on the climate analysis of the region at the german-Polish border as a preliminary step for a hydrological analysis of current and future conditions.Observed climatological data were processed and analysed using the indicators air temperature, precipitation, sunshine duration, potential evapotranspiration and the climatic water balance (cWB). the latter defines the difference between precipitation and potential evapotranspiration and is a measure for the climatological water availability in the region. Observations were used to statistically downscale data from global circulation Models under various scenarios regarding greenhouse gas emissions (a1B, rcP 2.6, rcP 8.5) and applying the weTTreg-method for regionalization. in total, 50 climate projections for periods up until the end of the 21 st century were analysed, with the application of the mentioned indicators.For the period 1971-2010, increasing trends of temperature, precipitation, sunshine duration and potential evapotranspiration were found. This leads to a reduced cwB in the summer half-year (Shy), which could be partly compensated by an increase in the winter half-year (why). Trends of temperature, sunshine duration and potential evapotranspiration remain positive for the far future (2071-2100), but precipitation decreases. These climatic conditions aggravate water availability, especially in the Shy. impacts on water management are very probable and were therefore further investigated in the neyMO project that applied hydrological models.