Fig. 2: Attribution of the trend in storage to precipitation and land-surface processes. | Nature Water

Fig. 2: Attribution of the trend in storage to precipitation and land-surface processes.

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

Fig. 2

a, Relationship between the trend of SLSI and the trend of SPI. b, Relationship between SLSI trend and SPR trend, which represents the changes in land-surface process. SLSI and SPI were calculated by normalizing the monthly time series of active storage and precipitation, respectively. SPR was calculated for each basin by dividing total active storage by volumetric precipitation (that is, precipitation rate multiplied by area). The trends for SPR were quantified using multivariate robust regression by excluding the impacts of precipitation on SPR (Methods). Lakes and reservoirs were grouped based on the Aridity Index (AI) into Arid (0 ≤ AI < 0.2), Semi-arid (0.2 ≤ AI < 0.5) and Dry subhumid (0.5 ≤ AI < 0.65). Trend significance was assessed using the non-parametric Mann–Kendall test at a significance level of 0.05 and a sample size of 36 (years).

Back to article page