A new index to assess meteorological drought: the Drought Exceedance Probability Index (DEPI)

Abstract

• It is simple and data undemanding, needing exclusively monthly precipitation time series. • One of its marks of identity is its rainfall anomaly accummulation, whose computation is restarted anytime negative anomalies reappear. • The DEPI values are the empirical probability of exceedance of the calculated rainfall cumulative anomalies. • The research revealed that the DEPI shows great ability to reflect the onset, end, actual duration and peak of the drought.

Testing of Drought Exceedance Probability Index (DEPI) for Turkey using PERSIANN data for 2000-2021 period

“…Detailed information about this system can be accessed from (Hsu et al, 1997;Hsu et al, 1999Hsu et al, , 2000Hsu et al, , 2002Sorooshian et al, 2000Sorooshian et al, , 2002Sorooshian et al, 2014;Nguyen et al, 2019).Monthly precipitation point totals for March 2000 and February 2021 were obtained from the PERSIANN system. DEPI (Limones et al, 2022) and SPI (McKee et al, 1993) were used in this study. The SPI method is not elaborated in this study since there are several studies about SPI worldwide.…”

“…Some of these measures are; De Martonne Method (De Martonne, 1942), Palmer Drought Severity Index (Palmer, 1965), Decile Index (Gibbs and Maher, 1967), Aydeniz Method (Aydeniz, 1973), Erinç Method (Erinç, 1984), Standardized Precipitation Index (McKee et al, 1993), Aggregated Drought Index (Keyantash and Dracup, 2004), Reconnaissance Drought Index (Tsakiris and Vangelis, 2005), Streamflow Drought Index (Nalbantis, 2008), Actual Precipitation Index (API) (Şen and Almazroui, 2021). In addition to these indices, new drought monitoring indices continue to be developed.One of the newest index among these is the Drought Exceedance Probability Index (DEPI) developed by (Limones et al, 2022). DEPI is a modification of the ISSP (Indice Standardisé de Sécheresse Pluviométrique) developed by (Pita, 2000).…”

“…The study aims to conduct periodic drought analysis of the period from January to December with the help of DEPI developed by (Limones et al, 2022) to monitor drought using monthly precipitation totals of 126 study points designated and located in Turkey. Precipitation data were obtained from the Precipitation Estimation from Remotely Sensed Information using Arti-ficial Neural Networks (PERSIANN) system, based on the location of the meteorological stations of the Turkish State Meteorological Service.…”

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“…El Índice de Probabilidad de Excedencia de Sequía, DEPI por sus siglas en inglés, se utiliza para este análisis debido a su simplicidad computacional, ya que solo requiere datos de lluvia, y porque muestra una gran capacidad para reflejar el inicio, fin, duración real e intensidad de la sequía pluviométrica (Limones et al, 2020). Las series temporales generadas del índice DEPI se examinan para determinar cuántas sequías flash se han producido en todos los píxeles de las tierras emergidas, exceptuando los desiertos, y cuándo.…”

“…-Cálculo del índice de sequía DEPI con datos pentadiarios El DEPI es un índice de sequía meteorológica basado en la acumulación de anomalías de precipitación (Limones et al, 2020), de forma similar al Índice de Precipitación Estandarizado (SPI) de McKee (McKee et al, 1995) o el derivado Índice Estandarizado de Precipitación-Evapotranspiración (SPEI) (Vicente- Serrano et al, 2010). Sin embargo, cada puntaje del DEPI representa la probabilidad empírica de exceder el nivel de sequía experimentado en ese momento o unidad de tiempo en particular (originariamente un mes concreto de la serie).…”