MONTHLY EXTENDED PREDICTING EXPERIMENTS WITH NON-LINE AR REGIONAL PREDICTION Ⅱ: IMPEROVEMENT OF WAVE COMPONENT PREDICTION

Based on Chen et al,the scheme of the combination of the pentad-mean zonal height departure nonlinear prediction with the T42L9 model prediction was designed,in which the pentad zonal heights atall the 12 initial-value-inputisobar levels from 50 hPa to 1000 hPa except 200,300 500 and 700 hPa were derived from nonlinear forecasts of the four levels by means of a good corelation between neighboring levels.Then the above pentad zonal heights on 12 isobar-levels were transformed to the spectrum coefficients of the temperature ateach integration step of T42L9 model Infinal,the nudging was made.On account of a variety oferror accumulation,the pentad zonal components of the monthly height on isobar levels out put by T42L9 model were replaced by the corresponding nonlinear results once more when integration was over.