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Drought Characterization Using Drought Indices and El Niño Effects

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Abstract

Droughts are extreme meteorological and hydrological events having severe impacts on the natural environment and socioeconomic conditions of the affected region. Drought characterization is vital in planning, design, and management of water resources systems. Drought indices such as standardized precipitation index (SPI) and standardized precipitation evapotranspiration index (SPEI) are generally used as a tool for monitoring changes in drought conditions. The variability of monsoon droughts over India is significantly influenced by the tropical sea surface temperature anomalies. A major portion of the drought variability is influenced by the El Niño–Southern Oscillation (ENSO). Drought characterization for Indo Gangetic alluvial plain demonstrates the efficacy of the present work. The values of SPI and SPEI are found in all the possible ranges representing mild, moderate, and severe drought events in the study area. Most drought events are observed in Raebareli District, as both SPI and SPEI indices showed 27 and 23 severe events. Also, correlation is found between observed drought periods, ENSO episodes, and drought indices.

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Acknowledgements

The authors would like to express appreciation for the support of the sponsors [Science and Engineering Research Board (SERB), Department of Science and Technology, Government of India, New Delhi]. The financial assistance received for this study was used for Senior Research Fellowship.

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Correspondence to Raj Mohan Singh.

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Singh, R.M., Shukla, P. Drought Characterization Using Drought Indices and El Niño Effects. Natl. Acad. Sci. Lett. 43, 339–342 (2020). https://doi.org/10.1007/s40009-019-00870-6

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  • DOI: https://doi.org/10.1007/s40009-019-00870-6

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