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Global assessment of the Standardized Evapotranspiration Deficit Index (SEDI) for drought analysis and monitoring

(2018) JOURNAL OF CLIMATE. 31(14). p.5371-5393
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Abstract
This article developed and implemented a new methodology for calculating the standardized evapotranspiration deficit index (SEDI) globally based on the log-logistic distribution to fit the evaporation deficit (ED), the difference between actual evapotranspiration (ETa) and atmospheric evaporative demand (AED). Our findings demonstrate that, regardless of the AED dataset used, a log-logistic distribution most optimally fitted the ED time series. As such, in many regions across the terrestrial globe, the SEDI is insensitive to the AED method used for calculation, with the exception of winter months and boreal regions. The SEDI showed significant correlations (p < 0.05) with the standardized precipitation evapotranspiration index (SPEI) across a wide range of regions, particularly for short (<3 month) SPEI time scales. This work provides a robust approach for calculating spatially and temporally comparable SEDI estimates, regardless of the climate region and land surface conditions, and it assesses the performance and the applicability of the SEDI to quantify drought severity across varying crop and natural vegetation areas.
Keywords
Drought, Evapotranspiration, Hydrometeorology, Indices, Climate variability, DIFFERENT TIME SCALES, SURFACE WIND SPEEDS, WACMOS-ET PROJECT, IBERIAN PENINSULA, SOIL-MOISTURE, UNITED-STATES, TERRESTRIAL EVAPOTRANSPIRATION, VEGETATION DISTRIBUTION, EVAPORATIVE DEMAND, ANALYTICAL-MODEL

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Citation

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Chicago
Vicente-Serrano, Sergio M, Diego Gonzalez Miralles, Fernando Domínguez-Castro, Cesar Azorin-Molina, Ahmed El Kenawy, Tim R McVicar, Miquel Tomás-Burguera, Santiago Beguería, Marco Maneta, and Marina Peña-Gallardo. 2018. “Global Assessment of the Standardized Evapotranspiration Deficit Index (SEDI) for Drought Analysis and Monitoring.” Journal of Climate 31 (14): 5371–5393.
APA
Vicente-Serrano, S. M., Gonzalez Miralles, D., Domínguez-Castro, F., Azorin-Molina, C., El Kenawy, A., McVicar, T. R., Tomás-Burguera, M., et al. (2018). Global assessment of the Standardized Evapotranspiration Deficit Index (SEDI) for drought analysis and monitoring. JOURNAL OF CLIMATE, 31(14), 5371–5393.
Vancouver
1.
Vicente-Serrano SM, Gonzalez Miralles D, Domínguez-Castro F, Azorin-Molina C, El Kenawy A, McVicar TR, et al. Global assessment of the Standardized Evapotranspiration Deficit Index (SEDI) for drought analysis and monitoring. JOURNAL OF CLIMATE. 2018;31(14):5371–93.
MLA
Vicente-Serrano, Sergio M, Diego Gonzalez Miralles, Fernando Domínguez-Castro, et al. “Global Assessment of the Standardized Evapotranspiration Deficit Index (SEDI) for Drought Analysis and Monitoring.” JOURNAL OF CLIMATE 31.14 (2018): 5371–5393. Print.
@article{8566815,
  abstract     = {This article developed and implemented a new methodology for calculating the standardized evapotranspiration deficit index (SEDI) globally based on the log-logistic distribution to fit the evaporation deficit (ED), the difference between actual evapotranspiration (ETa) and atmospheric evaporative demand (AED). Our findings demonstrate that, regardless of the AED dataset used, a log-logistic distribution most optimally fitted the ED time series. As such, in many regions across the terrestrial globe, the SEDI is insensitive to the AED method used for calculation, with the exception of winter months and boreal regions. The SEDI showed significant correlations (p {\textlangle} 0.05) with the standardized precipitation evapotranspiration index (SPEI) across a wide range of regions, particularly for short ({\textlangle}3 month) SPEI time scales. This work provides a robust approach for calculating spatially and temporally comparable SEDI estimates, regardless of the climate region and land surface conditions, and it assesses the performance and the applicability of the SEDI to quantify drought severity across varying crop and natural vegetation areas.},
  author       = {Vicente-Serrano, Sergio M and Gonzalez Miralles, Diego and Dom{\'i}nguez-Castro, Fernando and Azorin-Molina, Cesar and El Kenawy, Ahmed and McVicar, Tim R and Tom{\'a}s-Burguera, Miquel and Beguer{\'i}a, Santiago and Maneta, Marco and Pe{\~n}a-Gallardo, Marina},
  issn         = {0894-8755},
  journal      = {JOURNAL OF CLIMATE},
  language     = {eng},
  number       = {14},
  pages        = {5371--5393},
  title        = {Global assessment of the Standardized Evapotranspiration Deficit Index (SEDI) for drought analysis and monitoring},
  url          = {http://dx.doi.org/10.1175/jcli-d-17-0775.1},
  volume       = {31},
  year         = {2018},
}

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