These data represent monthly averaged values of selected variables for the Data Distribution Centre (DDC) of the Intergovernmental Panel on Climate Change (IPCC). (see also http://www.ipcc-data.org/) The model output prepared for IPCC Fourth Assessment SRES A1B experiment. For this experiment there are 3 ensemble runs available. This run was initiated from the end of the corresponding 20C3M run of CCSR/NIES/FRCGC (the same resolution as this run, realization = 1). The conditions including GHGs concentration and various aerosols emissions were changed according to the IPCC SRES A1B scenario in the course of this run. For model output data in higher temporal resulution and more variables visit the web page https://esg.llnl.gov:8443/home/publicHomePage.do.