Table 2.

Results of calibration and validation in three periods measured by the three metrics.

	Calibration			Validation
	$\mathit{Ens}$	R2	PBIAS (%)	$\mathit{Ens}$	R2	PBIAS (%)
Baseline
Tangnaiai	0.76	0.83	3.90	0.83	0.84	5.95
Lanzhou	0.73	0.85	15.71	0.82	0.88	16.93
Toudaoguai	0.68	0.80	12.45	0.74	0.78	11.62
Huaxian	0.60	0.77	− 13.71	0.78	0.85	1.61
Huanyuankou	0.63	0.79	4.88	0.74	0.80	9.70
1990s
Tangnaiai	0.68	0.75	18.59	0.80	0.91	21.45
Lanzhou	0.74	0.84	14.39	0.84	0.89	13.84
Toudaoguai	0.65	0.74	15.69	0.76	0.77	7.86
Huaxian	0.62	0.71	20.08	0.66	0.70	2.11
Huanyuankou	0.59	0.73	12.43	0.67	0.74	3.87
2000s
Tangnaiai	0.83	0.83	3.20	0.83	0.86	7.53
Lanzhou	0.78	0.86	8.64	0.76	0.90	8.93
Toudaoguai	0.70	0.76	13.86	0.65	0.76	13.91
Huaxian	0.76	0.76	− 8.64	0.69	0.78	− 7.72
Huanyuankou	0.61	0.72	24.73	0.62	0.71	14.23