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《Acta Meteorologica Sinica》 1958-03
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ON THE UTILIZATION OF PAST DATA IN NUMERICAL WEATHER FORECASTING

KOO CHEN-CHAO (Institute of Geophysics and Meteorology,Academia Sinica)  
Until now,past data are not utilized in numerical weather forecastingowing to the particular formulations of the problem.It is pointed out in thispaper that the condition for solution,formed by whole set of available mete-orological data,is not competible to the general system of weather equations.Thus it is neccessary to study the best way of formulation of the problemusing the available meteorological data as much as possible in the conditionfor solution,in order to obtain the optimum way of forecasting.Two possi-bilities are given.Firstly,it is shown that under certain condition,weatherforecasting may be formulated as an evolution problem,in which the pastdata are utilized.Secondly,past data could also be partly utilized in aninitial value problem in which the system of weather equations,with certainmeteorological variables eliminated,contain higher order time derivatives.Thesignificance of these formulations is discussed.
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