HADCM3_A2c_temp

Project: IPCC Data Distribution Centre : Third Assessment Report data setsThe Intergovernmental Panel on Climate Change (IPCC) has been established by WMO und UNEPto assess scientific, technical and socio-economic information, relevant for theunderstanding 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 thissection of the DDC (http://www.mad.zmaw.de/IPCC_DDC/html/ddc_gcmdata.html).This information contained in either IS92 emission scenarios (IPCC 1992), the SpecialReport on Emission Scenarios (IPCC 2000, SRES) or published model studies using data fromthese scenarios.Six alternative IPCC scenarios (IS92a to f) were published in the 1992 Supplementary Reportto the IPCC Assessment. These scenarios embodied a wide array of assumption affecting howfuture greenhouse gas emissions might evolve in the absence of climate policies beyondthose already adoped.The SRES scenarios have been constructed to explore future developmentsin the global enviromental with special reference to the production of greenhouse gasesand aerosol precursor emission.A set of four scenario families (A1, A2, B1, B2) have been developed that each of thisstorylines describes one possible demographic, polito-economic, societal and technologicalfuture. Model experiments, also using different forcing scenarios, were calculatedat other modeling centres.Emissions Scenarios. 2000 ,Special Report of the Intergovernmental Panel on Climate ChangeNebojsa Nakicenovic and Rob Swart (Eds.)Cambridge University Press, UK. pp 570Summary: The SRES data sets were published by the IPCC in 2000 and classifiedinto four different scenario families (A1, A2, B1, B2).SRES_A2 storyline describes a very heterogeneous worldwith the underlying theme of self-reliance and preservationof local identities. It results in this scenario a continousincreasing population together with a slower economic growthand technological change.The Hadley Centre Circulation Model is a 3-dim AOGCM describedby (Gordon et al., 2000 and Pope et al., 2000).The atmospheric component has a 19 levels horizontal resolution,comparable with spectral resolution of T42, while the oceancomponent has a 20 levels resolution.HADCM3(http://www.meto.gov.uk/research/hadleycentre/models/HadCM3.html )The changes of anthropogenic emissions of CO2, CH4, N2O andsulphur dioxide are prescribed according to the abovementioned scenario.These data belongs to a set of three ensemble runs, with theHADCM3-model, using the SRES_A2 scenario. They provide monthlyaveraged values of selected variables for the IPCC-DDC.HadCM3_SRES_A2b and HadCM3_A2c_temp follow the same experimental designand historical plus future forcings as HadCM3_SRES_A2 (Johns et al.2003) but starting from initial conditions taken respectively 100 yearsand 200 years further into the HadCM3 control simulation.