Analogue Correction Method of Errors by Combining Statistical and Dynamical Methods

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  • Funds:

    Supported jointly by the National Natural Science Foundation of China under Grant Nos. 40233031, 40575036 and 40675039.

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  • Based on the atmospheric analogy principle, the inverse problem that the information of historical analogue data is utilized to estimate model errors is put forward and a method of analogue correction of errors (ACE) of model is developed in this paper. The ACE can combine effectively statistical and dynamical methods, and need not change the current numerical prediction models. The new method not only adequately utilizes dynamical achievements but also can reasonably absorb the information of a great many analogues in historical data in order to reduce model errors and improve forecast skill. Furthermore, the ACE may identify specific historical data for the solution of the inverse problem in terms of the particularity of current forecast. The qualitative analyses show that the ACE is theoretically equivalent to the principle of the previous analogue-dynamical model, but need not rebuild the complicated analogue-deviation model, so has better feasibility and operational foreground. Moreover, under the ideal situations, when numerical models or historical analogues are perfect, the forecast of the ACE would transform into the forecast of dynamical or statistical method, respectively.
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    沈阳化工大学材料科学与工程学院 沈阳 110142

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Analogue Correction Method of Errors by Combining Statistical and Dynamical Methods

  • 1. Laboratory for Climate Studies,National Climate Center,China Meteorological Administration,Beijing 100081 College of Atmospheric Sciences,Lanzhou University,Lanzhou 73000;
    College of Atmospheric Sciences,Lanzhou University,Lanzhou 73000
Funds: Supported jointly by the National Natural Science Foundation of China under Grant Nos. 40233031, 40575036 and 40675039.

Abstract: Based on the atmospheric analogy principle, the inverse problem that the information of historical analogue data is utilized to estimate model errors is put forward and a method of analogue correction of errors (ACE) of model is developed in this paper. The ACE can combine effectively statistical and dynamical methods, and need not change the current numerical prediction models. The new method not only adequately utilizes dynamical achievements but also can reasonably absorb the information of a great many analogues in historical data in order to reduce model errors and improve forecast skill. Furthermore, the ACE may identify specific historical data for the solution of the inverse problem in terms of the particularity of current forecast. The qualitative analyses show that the ACE is theoretically equivalent to the principle of the previous analogue-dynamical model, but need not rebuild the complicated analogue-deviation model, so has better feasibility and operational foreground. Moreover, under the ideal situations, when numerical models or historical analogues are perfect, the forecast of the ACE would transform into the forecast of dynamical or statistical method, respectively.

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