The Use of SPEI and TVDI to Assess Temporal-Spatial Variations in Drought Conditions in the Middle and Lower Reaches of the Yangtze River Basin, China

Figure 2

The temporal variability of the SPEI at (a) 1-month lag, (b) 3-month lag, (c) 6-month lag, and (d) 12-month lag.

(a)

(b)

(c)

(d)