Using GRACE satellite observations for separating meteorological variability from anthropogenic impacts on water availability
| Autor: | Seyed-Mohammad Hosseini-Moghari, Qiuhong Tang, Kumars Ebrahimi, Amir AghaKouchak, Shahab Araghinejad |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Multidisciplinary
010504 meteorology & atmospheric sciences Anomaly (natural sciences) 0208 environmental biotechnology Water storage lcsh:R lcsh:Medicine 02 engineering and technology Structural basin 01 natural sciences Article 020801 environmental engineering Climatology Drought recovery Environmental science Satellite lcsh:Q Hydrology lcsh:Science Water use 0105 earth and related environmental sciences |
| Zdroj: | Scientific Reports, Vol 10, Iss 1, Pp 1-12 (2020) Scientific Reports |
| ISSN: | 2045-2322 |
| Popis: | Gravity Recovery and Climate Experiment (GRACE) observations provide information on Total Water Storage Anomaly (TWSA) which is a key variable for drought monitoring and assessment. The so-called Total Water Storage Deficit Index (TWSDI) based on GRACE data has been widely used for characterizing drought events. Here we show that the commonly used TWSDI approach often exhibits significant inconsistencies with meteorological conditions, primarily upon presence of a trend in observations due to anthropogenic water use. In this study, we propose a modified version of TWSDI (termed, MTWSDI) that decomposes the anthropogenic and climatic-driven components of GRACE observations. We applied our approach for drought monitoring over the Ganges–Brahmaputra in India and Markazi basins in Iran. Results show that the newly developed MTWSDI exhibits consistency with meteorological drought indices in both basins. We also propose a deficit-based method for drought monitoring and recovery assessment using GRACE observations, providing useful information about volume of deficit, and minimum and average time for drought recovery. According to the deficit thresholds, water deficits caused by anthropogenic impacts every year in the Ganges–Brahmaputra basin and Markazi basins is almost equal to an abnormally dry condition and a moderate drought condition, receptively. It indicates that unsustainable human water use have led to a form of perpetual and accelerated anthropogenic drought in these basins. Continuation of this trend would deplete the basin and cause significant socio-economic challenges. |
| Databáze: | OpenAIRE |
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