| A comparison of two global analysis systems in the Tropics - :12752 | National Weather Service (NWS)
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A comparison of two global analysis systems in the Tropics
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    An objective analysis system based upon the statistical optimum interpolation principle of Gandin has been developed at the National Meteorological Center, United States, for possible operational use during the period of the Global Weather Experiment. The performance of the analysis system in the Tropics is evaluated by comparison with the currently operational system, which employs a spectral objective analysis procedure. The operational system produces essentially nondivergent winds, an undesirable characteristic for an objective analysis system in the Tropics. In addition the operational system fails to make rational and systematic allowance for the varying error levels expected from the heterogeneous observing systems in the Tropics. The experimental system has been designed to overcome these shortcomings of the operational system. Evaluation in the Tropics is in part subjective: each system is judged according to the reasonableness of analyzed synoptic scale patterns. Objective evaluation includes calculation of statistical biases and statistical fit of analysis to observations. Finally, extended predictions to 72 hours, beginning from initial states prepared by each analysis method, are made and evaluated,

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