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Title

Standardized precipitation evapotranspiration index (SPEI) revisited: parameter fitting, evapotranspiration models, tools, datasets and drought monitoring

AuthorsBeguería, Santiago ; Vicente Serrano, Sergio M. ; Reig-Gracia, Fergus ; Latorre Garcés, Borja
KeywordsDrought
Drought index
Global warming
Evaporation
Penman–Monteith
Standardized precipitation index (SPI)
Palmer drought severity index (PDSI)
Issue DateAug-2014
PublisherWiley-Blackwell
CitationBeguería S, Vicente-Serrano SM, Reig F, Latorre B. Standardized precipitation evapotranspiration index (SPEI) revisited: parameter fitting, evapotranspiration models, tools, datasets and drought monitoring. International Journal of Climatology 34 (10): 3001-3023 (2014)
AbstractThe standardized precipitation evapotranspiration index (SPEI) was developed in 2010 and has been used in an increasing number of climatology and hydrology studies. The objective of this article is to describe computing options that provide flexible and robust use of the SPEI. In particular, we present methods for estimating the parameters of the log-logistic distribution for obtaining standardized values, methods for computing reference evapotranspiration (ET0), and weighting kernels used for calculation of the SPEI at different time scales. We discuss the use of alternative ET0 and actual evapotranspiration (ETa) methods and different options on the resulting SPEI series by use of observational and global gridded data. The results indicate that the equation used to calculate ET0 can have a significant effect on the SPEI in some regions of the world. Although the original formulation of the SPEI was based on plotting-positions Probability Weighted Moment (PWM), we now recommend use of unbiased PWM for model fitting. Finally, we present new software tools for computation and analysis of SPEI series, an updated global gridded database, and a real-time drought-monitoring system.
Description48 págs., 25 figs. Available online 21 December 2013. The definitive version is available at: http://onlinelibrary.wiley.com/journal/10.1002/(ISSN)1097-0088
Publisher version (URL)http://dx.doi.org/10.1002/joc.3887
URIhttp://hdl.handle.net/10261/90646
DOI10.1002/joc.3887
ISSN0899-8418
E-ISSN1097-0088
Appears in Collections:(EEAD) Artículos
(IPE) Artículos
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