Project: IPCC Data Distribution Centre : First Assessment Report data sets - The Intergovernmental Panel on Climate Change (IPCC) has been established by WMO and UNEP to assess scientific, technical and socio-economic information, relevant for the understanding of climate change, its potential impacts and option for adaption and migration. This project contains data sets from climate simulations with general circulation model. These calculations are using different forcing scenarios based on emmision scenarios for greenhouse gas and aerosols. _ This information contained in either IS92 emission scenarios (IPCC 1992) or published model studies using data from these scenarios. Six alternative IPCC scenarios (IS92a to f) were published in the 1992 Supplementary Report to the IPCC Assessment. These scenarios embodied a wide array of assumption affecting how future greenhouse gas emissions might evolve in the absence of climate policies beyond those already adoped. Model experiments, also using different forcing scenarios, were calculated at other modeling centres. Leggett, J., W.J. Pepper and R.J. Swart, 1992: Emissio ns Scenarios for IPCC: An Update. In: Climate Change 1992. The Supplementary Report to the IPCC Scientific Assessment [Houghton, J.T., B.A. Callander and S.K. Varney (eds.)], Cambridge University Press, Cambridge, UK, pp. 69-95. Summary: The second generation General Circulation Model (GCMII) at the Canadian Climate Centre was used to run a CO2 experiment in which the current climate (1xCO2) was compared with a new equilibrium climate obtained with twice the amount of atmospheric CO2 (2xCO2). The model was run around November 1989 at T32 resolution, and several surface parameters and 500mb heights were output on a 3.75-degree resolution grid. For the globe, DSS has monthly 20-year climatologies of some surface parameters.