Spatial and temporal characteristics of summer precipitation over Central Europe in a suite of high-resolution climate models

High-impact, localized intense rainfall episodes represent a major socio-economic problem for societies worldwide, and at the same time these events are notoriously difficult to simulate properly in climate models. Here, the authors investigate how horizontal resolution and model formulation influence this issue by applying the HARMONIE regional climate model (HCLIM) with three different setups; two using convection parameterization at 15 and 6.25 km horizontal resolution (the latter within the “grey-zone” scale), with lateral boundary conditions provided by ERA-Interim reanalysis and integrated over a pan-European domain, and one with explicit convection at 2 km resolution (HCLIM2) over the Alpine region driven by the 15 km model. Seven summer seasons were sampled and validated against two high-resolution observational data sets. All HCLIM versions underestimate the number of dry days and hours by 20-40%, and overestimate precipitation over the Alpine ridge. Also, only modest added value were found of “grey-zone” resolution. However, the single most important outcome is the substantial added value in HCLIM2 compared to the coarser model versions at sub-daily time scales. It better captures the local-to-regional spatial patterns of precipitation reflecting a more realistic representation of the local and meso-scale dynamics. Further, the duration and spatial frequency of precipitation events, as well as extremes, are closer to observations. These characteristics are key ingredients in heavy rainfall events and associated flash floods, and the outstanding results using HCLIM in convection-permitting setting are convincing and encourage further use of the model to study changes in such events in changing climates.

Youth, Religion and Participation : Theoretical and Methodological Approaches

This roundtable session focus on religious and social change as well as democracy and political culture, startingfrom the role of youth in these processes. The role of religion in young people’s participation is a key theme inthe cross-disciplinary network “youth and religion” connected to the Impact program. Participation here includesboth citizens’ “vertical” capacities to make their voices heard and influence decision-makers in the political system(e.g. via elections or civic organizations and social movements) and their “horizontal” capacities to communicateand cooperate with other people (within society at large or certain associations/communities). The participants ofthe session will present influential theories and methodologies used to study participation among youth within theresearch disciplines they represent (i.e. sociology of religion; theology; ethnology; political science). This will befollowed by a joint discussion of how these theories and methodologies have approached religious involvement witha particular focus on youth’s participation in politics, civil society as well as social media and the internet. The aim ofthe session is to look for common themes and new issues that can guide contemporary studies of participation in thefield of youth and religion. The session is open to conference participants interested in the issues discussed.