Project: IPCC Data Distribution Centre : Second 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. Projection of future trends for a number of key variables are provided through this section of the DDC (http://ipcc-data.org/sim/gcm_clim/IS92A_SAR/). 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. _ Model experiments, also using IS92a forcing scenarios, were calculated at other modeling centres: NCAR (National Center for Atmospheric Research, USA) GFDL (Geophysical Fluid Dynamics Laboratory, USA) CCCma (Canadian Centre for Climate Modelling and Analysis, Canada) CSIRO (Commonwealth Scientific and Industrial Research Organisation, Australia) Hadley Centre (Met Office Hadley Centre, UK) CCSR (Atmosphere and Ocean Research Institute, the University of Tokyo, Japan) DKRZ (German Climate Computing Center, Germany) MPI-M (Max Planck Institute for Meteorology, Germany) and more. Summary: The control integration, in which the atmospheric forcing is kept constant, simulates a period of 100 years. The value of CO2 in the whole run is approximately equal to the value observed in 1958 (this is the only thing which "fixes" the model years to real years). The initial conditions in the model atmosphere and ocean are in no way related to the conditions in 1958. Therefore due to natural variability both in the model and in the observed climate the state is different even though the radiative forcing was about equal between model and nature. These data represent monthly averaged surface values of selected variables for the IPCC-Data Distribution Centre. (see also http://www.ipcc-data.org/ )
