GCM data covering the region of Saudi Arabia are provided by the UK Met Office. Those data will be used to run a licensed RCM called 'PRECIS' that can be initiated at a resolution of 50 or 25 km. The resolution of 50 km is chosen because a 25 km run will take six times the amount of times needed to run experiments with 50 km resolution.

PRECIS (Providing Regional Climates for Impact Studies) is a regional climate modeling system that can be run on a PC. The UK Met Office's Hadley Center for Climate Prediction and Research is the provider and the developer of this software. The data for the boundary condition are supplied by the Hadley Center Global Climate Model (GCM), UK Met Office. PRECIS comes with a user interface to carry on climate experiments (Jones et al., 2004).

Future projections of climate change are done globally with worldwide support through United Nations Organizations. Very few countries have the capability to designate a dedicated group of highly trained scientists and provide extremely fast computers to run GCMs' models to generate climate change scenarios and perform the necessary analysis to investigate the regional impacts of climate change on their specific regions. The United Nations Development Program (UNDP), the UK Department for Environment, Food and Rural Affairs (DEFRA), and the UK Department of International Development started funding PRECIS to be available to developing countries to generate their own climate change scenarios with using a personal computer only. The UK Met Office's Hadley Center will supply the software, the boundary conditions, and other fields of global quantities required to run PRECIS (Jones et al., 2004). Emission scenarios describing population, energy, and economics are taken from IPCC SRES (A1T, A1FI, A1B, A2, B1, and B2). Concentration estimation of carbon dioxide, methane, sulfates, and other gases is done is carbon cycle and chemistry models. PRECIS will be used to enhance the relatively large-scale output of HadAM3P, a 150 km resolution Hadley Center's global atmospheric model to get fine, detailed information of climatic predictions.

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