Table 4 Fitting Parameters of the Semi-Variogram for ESV.

Grid units	Year	C0	C0 + C	A (km)	C0/(C0 + C)	Model Type	R²
1 km × 1 km	1985	0.0518	0.2816	18.86	0.1839	Exponential	0.603
	1995	0.0532	0.2954	18.36	0.1801	Exponential	0.63
	2005	0.0504	0.2998	19.05	0.1681	Exponential	0.612
	2015	0.0504	0.3108	18.7	0.1622	Exponential	0.644
	2023	0.0525	0.313	17.05	0.1677	Exponential	0.624
500 m × 500 m	1985	0.0031	0.0168	19.7	0.1856	Exponential	0.605
	1995	0.0032	0.0176	19.7	0.177	Exponential	0.633
	2005	0.0019	0.0186	17.04	0.1022	Exponential	0.635
	2015	0.0031	0.0186	18.38	0.1670	Exponential	0.637
	2023	0.0032	0.0187	18.7	0.1692	Exponential	0.617

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