期刊论文详细信息
Bragantia
Revisiting the probabilistic definition of drought: strengths, limitations and an agrometeorological adaptation
Gabriel Constantino Blain1 
[1] ,Centro de Ecofisiologia e Biofísica Instituto Agronômico Campinas SP ,Brasil
关键词: standardized precipitation index;    normality;    evapotranspiration;    Índice Padronizado de Precipitação;    normalidade;    evapotranspiração;   
DOI  :  10.1590/S0006-87052012000100019
来源: SciELO
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【 摘 要 】

Drought is a slow-moving hazard that occurs in virtually all countries of the world. In the light of this, several indices have been developed to improve the detection of drought's onset, as well as quantifying other features of this phenomenon. The Standardized Precipitation Index (SPI) is often used in order to characterize meteorological droughts. In addition, this index is largely used by Brazilian's agricultural institutions. In order to add important information to the drought literature, this review article described a general definition of drought, evaluated it from a statistical point of view, and also described the SPI strengths and limitations. An adaptation of the SPI that aims to develop a probability-based agricultural drought index was also presented. The results obtained herein, associated with several studies carried out throughout the world, demonstrated that the SPI is not an agricultural index. It is just a mathematical approach developed to transforming skewed distributions into the Gaussian form. If this standardization cannot be achieved, the use of this index becomes meaningless. Therefore, a normality test should be used in establishing a temporal lower limit for the SPI computations. It was also verified that for periods in which the probability associated with the zero precipitation value is close to 0.5, the SPI may erroneously indicate the end of an existing drought (or a decrease in its severity) in the presence of a decrease in the actual evapotranspiration values.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License

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