DEKLIM-EEM is a joint project consisting out of 9 individual proposals. The project was financially supported by the German Ministry for Education and Research(BMBF) within the framework of the research programme DEKLIM (www.deklim.de). The purpose of the joint project is to reconstruct the climate of past interglacials and to contribute to the understanding of mechanism that are responsible for the transition to a cold stage. This project was coordinated by the Institute for Geosciences, University of Mainz. A description of all individual proposals can be found at: http://www.uni-mainz.de/FB/Geo/Geologie/sedi/index.html The datasets in the CERA database are the results of the project contributions of the Model and Data Group at the Max-Planck-Institute for Meteorology and the Institute for Meteorology at the FU Berlin. The coupled atmosphere-ocean general circulation model ECHO-G has been used to perform climate simulations of the Eemian interglacial (125,000 years before present) and the subsequent glacial inception (115,000 years before present) by adapting Earth s orbital parameters and greenhouse gas concentrations to conditions of these periods. A simulation of pre-industrial climate is available for comparison.