Drought is an important climate event and is linked to water availability, temperature, sunshine, and wind speed (Dai, 2011; Trenberth et al., 2014). Generally, water availability plays an important role in terrestrial ecosystems, and drought has an adverse effect on vegetation growth (Mu et al., 2013; Wang et al., 2013). Several studies have focused on how drought changes under climate change. However, neither modeling nor observations provide a widely accepted answer to the question of how climate change impacts drought (Sheffield et al., 2012; Dai, 2013; Trenberth et al., 2014). Understanding the relationship between drought and changes in climate factors is crucial for predicting future changes in aridity and coping with drought-related issues.