An indirect method for determining some parameters in a forecast model has been developed, by which the program of the original model with little modification can be used as a subroutine of the inversion system and the optimum estimate of the parameters can be obtained by calling the subroutine time after time. It is specially useful for the sophisticated numerical weather prediction model. It may also be utilized to improve the forecast timely in case of obvious differences between the recent observations and the forecasts. The effect of the method is verified by numerical simulation tests with simple models.
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