摘要
Terrestrial water storage (TWS) is a very important component governing global changes. TWS change (ΔTWS) can only be estimated by hydrological modeling before 2002 when the Gravity Recovery and Climate Experiment (GRACE) space mission provided a highly valuable data set that allows studying of ΔTWS over large river basins worldwide since then. The lifetime of GRACE, however, is still too short to meet the needs for studying long term variability of ΔTWS during the past decades. In this paper, we reconstructed monthly and annual ΔTWS time series over the Amazon Basin in the past 65 years by use of GRACE-based TWS anomaly (TWSA) data and the Global Land Data Assimilation System (GLDAS) products. The rationality of the reconstructed annual ΔTWS time series was indirectly evaluated by examining the historic coherence between ΔTWS and El Niño-Southern Oscillation under conditions of poor availability of in situ observation data and lack of reference work published in Amazon Basin. These datasets offer a unique opportunity for understanding the varying characteristics of ΔTWS in the Amazon during the past 65 years. Besides improving our knowledge of long-term water resource variations in this large river basin, these reconstructed datasets not only contribute to droughts monitoring, but also provide a new perspective for understanding water resource variations in other big river basins.