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Project ChESS
Research Area Earth Sciences
Principal Investigator(s) Dr. Patrick Jöckel
  • Institute for Atmospheric Physics, University of Mainz, Germany
  • The Cyprus Institute, Energy, Environment and Water Research Center, Cyprus
  • Max Planck Institute for Chemistry, Germany


In Earth system modelling, the interacting domains (e.g., atmosphere, hydrosphere, cryosphere, etc.) of the environment are simulated in conjunction to study the nature of feedbacks between the different domains and processes and how they influence the properties of the whole system. A challenging task in particular is to represent the constituent cycles of chemically active species, since a wide range of temporal and spatial scales and a large number of species are involved. A global and a regional model are applied to address two different issues which both require tailor made coupling strategies: First, the chemical influence of the ocean on the atmospheric composition includes processes with a strong diurnal cycle (e.g. photochemical production), requiring a frequent exchange of information between the ocean and the atmosphere models. Second, the downscaling from the global to the regional and local scale by nesting a regional model into a global model requires the frequent transfer of boundary conditions from the global model to the regional model and between different instances (in different resolutions) of the regional model. For both model setups the coupling is implemented following different approaches in the Modular Earth Submodel System (MESSy, framework. The infrastructure provided by DEISA provides an ideal environment to systematically test and optimise the new developments.

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