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 A2 experiment. These datasets are available in netCDF and GRIB format. Initial conditions for this experiment were taken from 1 January 201 of the climate of the 20th century experiment named CM2Q-d2_1861-000-AllForc_h1. Several time varying forcing agents used during the100 year duration of this CM2Q-h1_SresA2_w2 experiment were based o output of the MOZART global atmospheric chemistry climate model whn driven by the SRES A2 emission scenarios. For the CM2Q-h1_SresA2_2 experiment volcanic aerosols were zero, land surface cover types were time invariant, and solar irradiance varied seasonally based upn late 20th century averages but with no interannual variation. For this experiment there is only one run available. For model output data in higher temporal resulution and more variables visit the web page https://esg.llnl.gov:8443/home/publicHomePage.do.