Global Drought Escalation Since 2014: Multivariate Insights for Ecosystem Resilience and Water Security
Qianqian Han, Yijian Zeng, Bob Su
Published: 2025/9/24
Abstract
How is climate change altering the global patterns, frequency, and intensity of drought? To investigate this, we analyzed global drought events from 2000-2020 using a composite of hydrological indices ({\Sigma}(ET-P), SSMI, and GRACE-DSI). Our results reveal that near-normal to severe droughts became increasingly widespread after 2014. Unexpectedly, extreme, 100-year return period droughts occurred not only in semi-arid zones but also in high latitude and typically wet regions. The frequency of these rare events increased globally, with durations exceeding 100 days in hotspots like Eurasia. Ecosystem case studies further showed divergent vulnerabilities in carbon and water cycling. These findings underscore an urgent need for region-specific adaptation strategies to enhance resilience against increasingly extreme droughts.