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This report describes the ARM (Atmospheric Radiation Measurement) operational variational objective analysis system. It is currently used to process the data collected from the ARM Intensive Operational Periods (IOPs) for driving and evaluating physical parameterizations in climate models. The analysis system was originally developed by Zhang and Lin (1997) at State University of New York at Stony Brook and was migrated to the Lawrence Livermore National Laboratory (LLNL) as the ARM operational objective analysis system in May 1999. In contrast with previous objective analysis (e.g., Barnes, 1964; O'Brien, 1970; Lin and Johnson, 1996), the ARM objective analysis used the constrained variational analysis method developed by Zhang and Lin (1997), in which the atmospheric state variables are forced to satisfy the conservation of mass, heat, moisture, and momentum through a variational technique. The purpose of this technical report is to provide an overview of the constrained variational analysis method, the architecture of the objective analysis system, along with in-depth information on running the variational analysis codes

Description of the ARM Operational Objective Analysis System