Figure 3
From: Climate change or irrigated agriculture – what drives the water level decline of Lake Urmia
Statistical analysis of runoff and weather time series. (a) Temporal evolution of 12-months SPEI and SRI (moving average filter with a kernel size of 12 months). A pointing up and down triangle shows a significant positive and negative Mann-Kendall trend, respectively. A dot means no significant trend (p = 0.05). (b) Relationship between discharge weighted monthly mean SPEI and SRI values. (c) Probability density plot of the linear regression slope of the SRI-SPEI relationship based on bootstrap sampling. (d) Temporal evolution of anthropogenic influences affecting Lake Urmia’s water budget. (a–d) The color code used refers to the periods defined in Figs. 2 and 3a and grey colored lines or dots representing the period 1954–1965. (Plots are generated using MATLAB R2019b, www.mathworks.com).
