Fig. 5: Increase in annual hours exposed to (moist-)heat extreme events over the grid cells with the most substantial irrigation expansion.
From: Impacts of irrigation expansion on moist-heat stress based on IRRMIP results
a–c Time series of the annual hours over the grid cells with ≥ 40% of irrigated fraction increase (in the year 2014 compared to the year 1901) of 2-m air temperature (T2m: a), HUMIDEX (HU: b), and wet-bulb temperature (Tw: c) warm extremes. The warm extremes are defined as the period when T2m, HU, and Tw exceed their 99.9th percentile values of the first 30 years (1901–1930) in the simulations without irrigation expansion (1901irr). Lines indicate the median value among six models and ranges indicate the middle four of six models. Curves were smoothed using Savitzky-Golay filtering (order = 2, window = 15)72. The range of the y-axes are different for three sub-plots. Results of various extreme events of T2m over grid cells with different extent of irrigation expansion is shown in Fig. S8, and similar results of HU and Tw can be found in Figs. S43–44.
