Drought Events over the Amazon River Basin (1993–2019) as Detected by the Climate-Driven Total Water Storage Change

The Gravity Recovery and Climate Experiment (GRACE) mission has measured total water storage change (TWSC) interpreted drought patterns in an unparalleled way since 2002. Nevertheless, there are few sources that can be used to understand prior the GRACE era. In this study, we extended gridded TWSC 1993 by combining principal component analysis (PCA), least square (LS) fitting, multiple linear regression (MLR) methods using climate variables as input drivers. We (climate-driven) interpret (1993–2019) over Amazon basin. Results showed that, area with resolution of 0.5°, GRACE, follow on, Swarm had correlation coefficients 0.95, 0.92, 0.77 compared climate-driven TWSCS, respectively. assessed were consistent those Palmer Drought Severity Index TWSC. also found 1998 2016 events Amazon, both induced strong El Niño events, similar patterns. This study provides a new perspective for interpreting long-term period.