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- W3196635449 endingPage "126871" @default.
- W3196635449 startingPage "126871" @default.
- W3196635449 abstract "• A multiscalar standardized terrestrial water storage index (STI) based on GRACE TWS is proposed to assess droughts. • The short-term STI has higher correlation with long-term SPI and SPEI in the aspect of spatial distributions and temporal correlations. • The index is a robust multiscalar hydrological drought indicator with less noise. • STI has higher correlations with NDVI variations compared to other drought indices. A multiscalar standardized terrestrial water storage index (STI) is proposed to assess global hydrological droughts in this study. STI is defined as the standardized statistical deviation of terrestrial water storage (TWS) measured by GRACE to the climatology at multiple time scales. Because of the statistical nature of its definition, the proposed index is comparable to other standardized drought indices in different time scales, e.g., standardized precipitation index (SPI), standardized precipitation evapotranspiration index (SPEI) across different regions at multiple time scales. Our comparisons of STI with multiscalar drought indices (i.e. SPI and SPEI) and uni-scalar indices (i.e. self-calibrating palmer drought severity index [scPDSI], standardized soil moisture index [SM-Z], standardized runoff index [R-Z], and GRACE-based drought severity index [DSI]) show that STI can capture drought events with less noise than other indicators in persistent drought events. As a hydrological drought index based on TWS (which includes groundwater, soil moisture, etc.), STI at short-term time scales (e.g. 3 and 6 months) have higher correlations (mostly > 0.7) with SPI/SPEI at long-term scales (e.g. 18 and 24 months). Since the TWS measured by GRACE incorporates the impacts of the accumulated changes in meteorological variables, hydrological processes, and human activities as well as the advantage of multiscale, STI better represents vegetation growth reflected by Normalized Difference Vegetation Index (NDVI) than uni-scalar drought indices including the GRACE-based DSI, suggesting STI is a robust indicator for hydrological droughts and vegetation changes." @default.
- W3196635449 created "2021-09-13" @default.
- W3196635449 creator A5032557195 @default.
- W3196635449 creator A5060108171 @default.
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- W3196635449 creator A5087635015 @default.
- W3196635449 creator A5090567363 @default.
- W3196635449 creator A5090949378 @default.
- W3196635449 date "2021-12-01" @default.
- W3196635449 modified "2023-10-12" @default.
- W3196635449 title "Use of a multiscalar GRACE-based standardized terrestrial water storage index for assessing global hydrological droughts" @default.
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