Fig. 1: Long-term changes in surface water storage for global dryland river basins. | Nature Water

Fig. 1: Long-term changes in surface water storage for global dryland river basins.

From: Decoupling of surface water storage from precipitation in global drylands due to anthropogenic activity

Fig. 1

a, Annual changes in active storage for total (that is, lakes and reservoirs) surface water, lakes and reservoirs. b, Annual changes in active storage for older and new reservoirs. c, Long-term trend for total active storage for the 128 basins in global drylands. d, Attribution of the long-term trend to lakes, older reservoirs and new reservoirs. Lakes and reservoirs were differentiated according to the HydroLAKES dataset and the GOODD dataset. The new reservoirs were defined as reservoirs constructed in 1983 or later whereas older reservoirs were those constructed before 1983, which is chosen as two years prior to 1985 to account for the impoundment period. Basins are represented by the HydroBASIN Level-3 basins. In c, the stippling marks basins for which the long-term trend is statistically significant (with non-parametric Mann–Kendall test at a significance level of 0.05 and a sample size of 36). In d, the ‘+’ represents a positive effect and the ‘−’ represents a negative effect. Basemaps in b and c from World Bank Official Boundaries under a Creative Commons licence CC BY 4.0.

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