Standardised Precipitation Evapotranspiration Index

The Standardized Precipitation Evapotranspiration Index (SPEI) is a multiscalar Drought index based on climatic data. It Developed by Vicente-Serrano et al. (2010) at the Institute Pirenaico de Ecologia in Zaragoza, Spain.[1] It can be used for determining the onset, duration and magnitude of drought conditions with respect to normal conditions in a variety of natural and managed systems such as crops, ecosystems, rivers, water resources, etc.[2][3][4]

SPEI Classification[5]
Value classification
2.0 or more Extremely Wet
1.5 to 1.99 Very Wet
1.0 to 1.49 Moderate Wet
-0.99 to 0.99 Normal
-1.0 to -1.49 Moderate Dry
-1.5 to -1.99 Very Dry
-2.0 or less Extremely Dry

See also

References
  1. Svoboda, Mark D.; Fuchs, Brian A. (2017-09-25), "Handbook of Drought Indicators and Indices*", Drought and Water Crises, Second edition. | Boca Raton : CRC Press, 2018. | 1st edition published in 2005.: CRC Press, pp. 155–208, doi:10.1201/b22009-11, ISBN 978-1-315-26555-1, retrieved 2023-05-18{{citation}}: CS1 maint: location (link)
  2. Vicente-Serrano S.M.; Santiago Beguería; Juan I. López-Moreno (2010). "A Multiscalar Drought Index Sensitive to Global Warming: The Standardized Precipitation Evapotranspiration Index". Journal of Climate. 23 (7): 1696–1718. Bibcode:2010JCli...23.1696V. doi:10.1175/2009JCLI2909.1. S2CID 3826822.
  3. Stagge, J. H.; Tallaksen, L. M.; Xu, C. Y.; Van Lanen, H. A. (2014). "Standardized precipitation-evapotranspiration index (SPEI): Sensitivity to potential evapotranspiration model and parameters". Hydrology in a changing world. IAHS-AISH Proceedings and Reports. Vol. 363. pp. 367–373. ISBN 9781907161414.
  4. Tirivarombo, S.; Osupile, D.; Eliasson, P. (2018). "Drought monitoring and analysis: standardised precipitation evapotranspiration index (SPEI) and standardised precipitation index (SPI)". Physics and Chemistry of the Earth, Parts A/B/C. 106: 1–10. Bibcode:2018PCE...106....1T. doi:10.1016/j.pce.2018.07.001. S2CID 134507763.
  5. Hayes, Michael J. (2006-10-13), "Drought Indices", Van Nostrand's Scientific Encyclopedia, Hoboken, NJ, USA: John Wiley & Sons, Inc., doi:10.1002/0471743984.vse8593, ISBN 0471743984, retrieved 2023-05-18


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