Spatiotemporal Changes of sc-PDSI and Its Dynamic Drivers in Yellow River Basin

Droughts in the Yellow River Basin (YRB), a typical large river arid to semiarid regions, have been studied extensively. However, details of dynamic drivers meteorological droughts, such as precipitation (P), reference evapotranspiration (ET0), and actual (AET), are unclear YRB, is whether or not main driver drought each subzone consistent. In order solve this issue, we analyzed (1) seasonal distribution YRB (2) sc-PDSI driver’s trends by using linear trends, Sen’s slope, Z statistics from 1951 2017; (3) probability sc-PDSI, P, ET0, AET; (4) correlation with some factors that drive drought; (5) conducted Pearson analysis between at 0.5° pixel scale. The results show northwest region was drier than southeast region, spring winter more severe other seasons. showed downwards trend (?0.47/decade), P AET also (?3.408 mm/decade, ?0.27 mm/decade), while ET0 significant upwards (12.013 mm/decade) YRB. midstream had highest risk drought. were highly correlated on 12-month timescale. upstream downstream ET0.