Numerical Studies on Forecast Error Correction of GRAPES Model with Variational Approach

Table 3

Average of RMSE of test samples of geopotential height on 500 hPa (unit: gpm).

Test month	GRAPES model	Systematic error correction	Nonsystematic error correction of DEM	Nonsystematic error correction
2008 Jan.	11.263	9.489	8.928	8.376
2009 Jan.	11.077	8.588	8.022	7.930
2010 Jan.	11.306	8.854	8.494	8.110
2008 Jul.	8.686	7.415	7.173	6.984
2009 Jul.	8.887	7.104	7.008	6.811
2010 Jul.	9.380	7.532	7.208	7.024