Parallel Climate Model Effort(Version 1) This is a joint effort to develop a DOE-sponsored parallel climate model between Los Alamos National Laboratory (LANL), the Naval Postgraduate School (NPG), the US Army Corps of Engineers Cold Regions Research and Engineering Lab(CRREL) and the National Center for Atmospheric Researcl (NCAR). We have coupled the NCAR Community Climate Model version 3, the LANL Parallel Ocean Program, and a sea ice model from the Naval Postgraduate School together in a massively parallel computer environment. This is Version I of the PCM(PCMl) Our target machines were the CRAY T3D/T3E and SGl Origin 2000. With the close cooperation and assistance of NCAR's Scientific Computing Division, the PCMI model code has been ported to the Hewlett-Packard, the SGl Origin 2000, the IBM SP2, and Compaq Based on the experience with the NCAr Climate System Model, in order to minimize the initial drift of the coupled system, the ocean/ice can be spun-up with forcing from previous CCM3 runs with prescribed ocean temperatures. This has also been useful in demonstrating and improving the kind of adjustments that occur in the ocean and ice due to coupling the CCM3, without having to run the more expensive coupled system. The full system has been in full production with several control experiments and many ensemble climate change simulations in progress and completed The atmospheric component is the massively parallel version of the NCAR Community Climate Mode version 3. 2(CCM3). This model includes the latest versions of radiation, boundary physics, and precipitation physics and is a state-of-the-art atmospheric component. The CCM3 also includes the land surface model (Lsm) which takes into account soil physics and vegetation. Ocean Component We have a limited spin-up of a moderate resolution global ocean model with a displaced pole grid using the POP(Parallel Ocean Program) model. The grid is 384 x 288 x 32, with an average resolution of 2/3 degree latitude and longitude with increased latitudinal resolution near the equator of approximately 1/2 degree Because of the displaced pole, there is relatively higher horizontal resolution in the eastern North Pacific, in the arctic Straits near northern Canada and greenland and in the gulf Stream area. also. the continents and bottom topography were carefully modified to obtain realistic flow in many regions throughout the globe. This model is being spun up with observed surface and subsurface forcing in preparation for coupling. We also plan to add more realistic ocean parameterizations to the model. The model in its present form yields an extraordinary simulation of the Arctic Ocean, tropical Pacific, and boundary currents, such as the Gulf Stream, with eddies solved in most basins. We have developed tools to interpolate the model output to regular grids Integrations have been run on the T3D and SGl Origin at NCAR, National Energy Research Supercomputing Center's T3E, and an SGI Origin at LANL. More documentation on the POP model can be found in Los Alamos report LA-UR-95-1146 by Richard D Smith, Samuel Kortas, Bertrand Meitz, Curvilinear Coordinates for Global Ocean Models, pp 38 Sea Ice Component The PCTM dynamic-thermodynamic sea ice model has been developed by combining two existing sea ice1 Parallel Climate Model Effort (Version 1) This is a joint effort to develop a DOE-sponsored parallel climate model between Los Alamos National Laboratory (LANL), the Naval Postgraduate School (NPG), the US Army Corps of Engineers' Cold Regions Research and Engineering Lab (CRREL) and the National Center for Atmospheric Research (NCAR). We have coupled the NCAR Community Climate Model version 3, the LANL Parallel Ocean Program, and a sea ice model from the Naval Postgraduate School together in a massively parallel computer environment. This is Version 1 of the PCM (PCM1). Our target machines were the CRAY T3D/T3E and SGI Origin 2000. With the close cooperation and assistance of NCAR's Scientific Computing Division, the PCM1 model code has been ported to the Hewlett-Packard, the SGI Origin 2000, the IBM SP2, and Compaq. Based on the experience with the NCAR Climate System Model, in order to minimize the initial drift of the coupled system, the ocean/ice can be spun-up with forcing from previous CCM3 runs with prescribed ocean temperatures. This has also been useful in demonstrating and improving the kind of adjustments that occur in the ocean and ice due to coupling the CCM3, without having to run the more expensive coupled system. The full system has been in full production with several control experiments and many ensemble climate change simulations in progress and completed. Atmospheric Component The atmospheric component is the massively parallel version of the NCAR Community Climate Model version 3.2 (CCM3). This model includes the latest versions of radiation, boundary physics, and precipitation physics and is a state-of-the-art atmospheric component. The CCM3 also includes the land surface model (LSM) which takes into account soil physics and vegetation. Ocean Component We have a limited spin-up of a moderate resolution global ocean model with a displaced pole grid using the POP (Parallel Ocean Program) model. The grid is 384 x 288 x 32, with an average resolution of 2/3 degree latitude and longitude with increased latitudinal resolution near the equator of approximately 1/2 degree. Because of the displaced pole, there is relatively higher horizontal resolution in the eastern North Pacific, in the Arctic Straits near northern Canada and Greenland, and in the Gulf Stream area. Also, the continents and bottom topography were carefully modified to obtain realistic flow in many regions throughout the globe. This model is being spun up with observed surface and subsurface forcing in preparation for coupling. We also plan to add more realistic ocean parameterizations to the model. The model in its present form yields an extraordinary simulation of the Arctic Ocean, tropical Pacific, and boundary currents, such as the Gulf Stream, with eddies solved in most basins. We have developed tools to interpolate the model output to regular grids. Integrations have been run on the T3D and SGI Origin at NCAR, National Energy Research Supercomputing Center's T3E, and an SGI Origin at LANL. More documentation on the POP model can be found in Los Alamos report LA-UR-95-1146 by Richard D. Smith, Samuel Kortas, Bertrand Meitz, Curvilinear Coordinates for Global Ocean Models, pp 38. Sea Ice Component The PCTM dynamic-thermodynamic sea ice model has been developed by combining two existing sea ice