Institute of Meteorology and Climate Research


Investigation of atmospheric composition and climate: Interactions from global to regional scales.

Questions addressed: What are the important factors determining interactions between regional climate change and atmospheric composition? What are the potential impacts of climate change and air quality changes on human health and ecosystems?

Regional climate change (REKLIM)


The Helmholtz Climate Initiative REKLIM (Regionale Klimaänderungen/Regional climate change) is a consortium of nine research centres within the Helmholtz Association. REKLIM is using its unique combination of competence in regional observations and process studies (in situ observations, airborne and satellite remote sensing) coupled with model simulations to improve regional and global climate models, which provide a solid basis for climate-related decision support. Moreover, global climate simulations are used to determine the effects of climate variability and change on the regional scale with improved modelling tools for attribution and impact studies. On the other hand, process modules and parameterisations from these regional studies serve to improve global climate models. The Climate Initiative will facilitate various scientific opportunities for improving knowledge of the regional Earth System, in particular with respect to impacts. Via the Helmholtz Regional Climate Offices and theClimate Service Centre policymakers and other decision makers will be supported in assessing risks and opportunities and designing mitigation and adaptation strategies.

Prof. Dr. Peter Braesicke of the Karlsruhe Institute of Technology (IMK-ASF) and PD Dr. Martin Schultz of the research centre Jülich, IEK-8 are the heads of topic 5: Atmospheric composition and climate: Interactions from global to regional scales.

The global atmospheric composition-climate system  encompasses many scales and feedbacks. In topic 5 the full chain of global to regional challenges is explored through the use of models and atmospheric observations. For example, chemical budgets are investigated as well as stratosphere-troposphere exchange, tropopause structure and aerosol impacts on the global scale. On smaller scales one focus is placed on the interactions of clouds, precipitation and composition. Another topic is the urban environment and its impact on composition and climate, in particular with respect to urban heat stresses and air quality, and their impacts on humans and ecosystems.


A new Photolysis Module for the Regional Chemistry-Transport Model COSMO-ART by Jennifer Schröter and Roland Ruhnke, Bad  Salzschlirf, 2014












Simulating the Ozone Distribution over Europe in May 2008 with a new Photolysis Module for COSMO-ART by Jennifer Schröter, Roland Ruhnke and Heike Vogel, Berlin, 2014












The study of reactive nitrogen intrusions into the stratosphere with vertically extended EMAC by Alexey Vlasov and Thomas Reddmann, Berlin, 2014












Towards the simulation of the Middle Atmosphere-Lower Thermosphere with EMAC-CMAT by Alexey Vlasov, Andreas Baumgärtner, Stefan Versick and Thomas Reddmann, Bad Honnef, 2013