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

Table 2

Average of RMSE of geopotential height on 500 hPa after correction of nonsystematic error for test samples with different truncation orders (unit: gpm).

Test type		R = 20	R = 25	R = 30	R = 35	R = 40
24 h of January	2008	8.475	8.440	8.376	8.370	8.406
	2009	7.925	7.876	7.930	7.937	8.003
	2010	8.128	8.097	8.110	8.107	8.094
24 h of July	2008	7.035	7.011	6.984	6.968	6.950
	2009	6.852	6.813	6.811	6.813	6.804
	2010	7.003	6.974	7.024	7.015	7.016
48 h of January	2008	13.908	13.840	13.786	13.917	13.929
	2009	14.638	14.508	14.438	14.485	14.426
	2010	14.335	14.229	14.161	14.093	14.157
48 h of July	2008	11.403	11.382	11.397	11.333	11.307
	2009	12.008	12.103	12.038	12.081	12.107
	2010	11.702	11.769	11.886	11.847	11.871