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Loss ratio [per thousand] accumulated over Germany for winter storm events from 1997-2016.

ClimXtreme II --Module-C-Coordination

Uwe Ulbrich

Module C coordination and index clustering (COO) ClimXtreme II is an interdisciplinary research network consisting of 17 collaborating institutions and 25 subprojects, funded by the German Federal Ministry of Education and Research (BMBF). ClimXtreme aims to improve the understanding of extreme weather events in Europe in the context of anthropogenic climate change. COO coordinates ClimXtreme II in close collaboration with the coordination of Modules A, B, and D. The coordination will take care that the overall research questions of ClimXtreme II. Furthermore, COO is responsible to fulfill the general aims of Module C (impacts). There are two overarching activity groups in ClimXtreme II which will be coordinated by COO: the "Post Event Assessment Group" (PostAG) and the "Hazard Specific Stakeholder Interaction Groups" (HaSSI group). The PostAG will act using a certain protocol and assess extreme events occurring during ClimXtreme II. The HaSSI groups ensure the interaction between stakeholders and ClimXtreme research projects. Scientifically, COO will further extend and analyze the integrated database of indices of ClimXtreme. The database includes indices from all hazards of Module C which are wind, precipitation and temperature and drought related. Indices link meteorological parameters to impacts as storm loss, flooding from spatially small scales to large river floods, crop failure and agricultural droughts. Analysis of the database will focus on sequences of hazards which lead to a potential increase of impacts. This will be done for different combinations of hazard types, e.g. succeeding periods with high rainfall amounts, and subsequent flooding. Those sequences can be classified as multivariate and preconditioned compound events. The integrated database enables the possibility to interrelate sector specific impacts and sequences and to analyze compound events which are explicitly defined by the combination of impact-related hazards and thresholds. The database is then used to investigate the climate change of these sequences. Further information https://www.climxtreme.de/

Difference in % between the simulation periods 1971-2000 and 2071-2100 for the number of days showing a probability for rockfall that is higher than the climatological probability. Hatching denotes regions for which the signal is statistically signi

LASLI (ClimXtreme)

Uwe Ulbrich, Bodo Damm

Slope failure processes (e.g. landslides, rockfall) in Central Europe are associated with high damage on road, railway and building infrastructure as well as casualties. While the general susceptibility for such events is determined by geological and geophysical conditions, meteorological factors frequently determine the triggering of the hazard. High moisture preconditions, intensive precipitation and processes related to frost have been identified as important triggers. Based on landslide and rockfall records, the contribution of the meteorological factors on the frequency of slope failure events in the German low mountain regions was determined. Changes in the occurrence probabilities of such events under climate change conditions are investigated using multi-model ensemble of regional climate scenario simulations. Under RCP8.5 scenario conditions rockfall probability in the study region is likely to decrease while landslides are expected to become more frequent. LASLI is a subproject within ClimXtreme. It is conducted in collaboration with the research group  Applied Physical Geography at the University of Vechta. Publications: K.M. Nissen, S. Rupp, T.M. Kreuzer, B. Guse, B. Damm and U. Ulbrich, 2022: Quantification of meteorological conditions for rockfall triggers in Germany, Nat. Hazards Earth Syst. Sci., 22, 2117–2130, https://doi.org/10.5194/nhess-22-2117-2022 . K.M. Nissen, M., Wilde, M., Kreuzer, T. M., Wohlers, A., Damm, B., and Ulbrich, U.: A decrease in rockfall probability under climate change conditions in Germany, EGUsphere [preprint], https://doi.org/10.5194/egusphere-2023-94 , 2023. (under review)

Sturmklima Hessen

Uwe Ulbrich

In a changing climate, with increasing temperatures and moisture, the extratropical circulation will likely change, and so will the dynamics of North Atlantic windstorms. Extratropical storms may take different paths than in the past, and show modified characteristics such as their frequency, intensity, lifetime, or extent. However, these changes of storm characteristics and impacts, especially on the regional scale, still exhibit substantial uncertainties due to low confidence in the underlying changes of the circulation and storm tracks in a changing climate - partly because the interannual variability is larger than climate change related trends but also because previous analyses are based coarse resolution simulations and/or single model studies. This project “Sturmklima Hessen”, funded by HLNUG (Hessisches Landesamt für Naturschutz, Umwelt und Geologie), aims to address these issues. It aims to estimate the spread of possible developments regarding the storm risk and its impacts for the federal state of Hessen, Germany in a changing climate. A multitude of global and regional climate simulations is evaluated, including spatially and temporally higher resolved models preferably in large ensembles, to draw robust conclusions on expected changes using different warming scenarios. In cooperation with the GDV (Gesamtverband der Deutschen Versicherungswirtschaft) the storm induced loss on residential buildings will be related to the wind speed of model and observation based data using deterministic and probabilistic statistical models. The impact of the resolution of the model on the representation of the storm climate is explored and particularly ruinous episodes as well as categorized storm events are downscaled to estimate the range of losses. Seasonal and decadal predictions are considered as well as high resolved (regional) climate experiments.