Fig. 2
From: Catalogue of drought events in peninsular Spanish along 1916–2020 period
Identification of drought events: time series of the 12-months SPI for the whole study area (a); time series of the fraction of the study area under drought conditions according to different thresholds: SPI12 <−0.84 (b) SPI12 <−1.28 (c) and SPI12 <−1.65 (d). The horizontal line at 20% in (b) indicates the threshold used for identifying the drought events, which are highlighted by a grey shade and numbered.
