Sensitivity Evaluation of Spectral Nudging Schemes in Historical Dynamical Downscaling for South Asia

Table 6

Comparison of the root-mean-square error (RMSE) and spatial correlation (SCORR) of SSBC_Def and SSBC_New for variables such as the wind vector (m s⁻¹), temperature (°C), and geopotential height (m) at 850 hPa from the NCEP-CFSR (the bold and the bold italic parts for JJA and DJF show stronger correlations and less errors).

Domain	Wind				Relative humidity				Air temperature				Geopotential height
	SSBC_Def		SSBC_New		SSBC_Def		SSBC_New		SSBC_Def		SSBC_New		SSBC_Def		SSBC_New
	RMSE	SCORR	RMSE	SCORR	RMSE	SCORR	RMSE	SCORR	RMSE	SCORR	RMSE	SCORR	RMSE	SCORR	RMSE	SCORR
JJA
CORDEX-SA	1.333	0.955	1.191	0.964	11.336	0.906	10.303	0.923	0.854	0.984	0.991	0.973	9.170	0.984	8.680	0.981
SA	1.390	0.926	1.170	0.939	12.507	0.808	10.962	0.887	0.607	0.979	0.775	0.976	10.743	0.986	9.059	0.989
MN	0.945	0.921	2.077	0.438	2.767	0.734	4.940	0.771	0.274	0.966	0.251	0.977	13.949	0.990	11.172	0.986
EIO	0.911	0.921	0.804	0.936	21.346	−0.347	18.277	0.227	1.069	0.987	0.915	0.950	6.854	0.960	5.880	0.991
WG	1.069	0.710	1.254	0.607	2.448	0.860	5.049	0.681	0.312	0.939	0.497	0.955	9.583	0.998	6.659	0.996
DJF
CORDEX-SA	6.014	−0.251	6.008	−0.270	9.319	0.905	8.943	0.914	0.734	0.996	0.691	0.997	6.753	0.948	8.291	0.910
SA	6.357	−0.310	6.227	−0.329	10.763	0.916	8.963	0.951	0.672	0.997	0.559	0.997	7.982	0.877	9.138	0.879
MN	4.256	−0.303	3.552	−0.343	10.236	0.851	5.966	0.846	0.740	0.969	0.498	0.948	6.828	0.972	7.894	0.935
EIO	0.262	5.111	4.957	0.305	13.930	0.671	11.208	0.749	0.550	0.755	0.515	0.639	5.474	0.586	3.672	0.739
WG	7.553	0.089	7.771	−0.227	3.897	0.934	4.178	0.930	0.407	0.861	0.462	0.820	4.969	0.931	5.437	0.974