Evaluation of Groundwater Storage Variations in Northern China Using GRACE Data

Table 3

TWS errors estimation in river basins and representative provinces from 2003 to 2012.

	Locations	Area; (10^4 km^2)	Yearly averaged GWS variation (cm EWH)	Yearly change rate of GWS variation (cm yr^−1)	Measurement (cm)	Leakage (cm)
Province	Jing-Jin-Ji	21.83			1.22	2.32
	Henan	16.70			1.82	2.42
River basin	The Songhua RB	92.49			1.02	0.92
	The Liao RB	31.38			1.11	1.10
	The Northwestern RBs	338.71			0.55	0.39
	The Hai RB	31.82			1.33	1.57
	The Yellow RB	79.21			0.89	0.90
	The Huai RB	33.17			1.77	1.63

measured errors and leakage errors are calculated based on Landerer and Swenson [28] and Long et al. [29].