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Earth System Dynamics An interactive open-access journal of the European Geosciences Union
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https://doi.org/10.5194/esd-2020-46
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/esd-2020-46
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  24 Aug 2020

24 Aug 2020

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A revised version of this preprint was accepted for the journal ESD and is expected to appear here in due course.

Rankings of extreme and widespread dry and wet events in the Iberian Peninsula between 1901–2016

Margarida L. R. Liberato1,2, Irene Montero1, Célia Gouveia2,3, Ana Russo2, Alexandre M. Ramos2, and Ricardo M. Trigo2 Margarida L. R. Liberato et al.
  • 1Escola de Ciências e Tecnologia, Universidade de Trás-os-Montes e Alto Douro, UTAD, 5000-801 Vila Real, Portugal
  • 2Instituto Dom Luiz, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal
  • 3Instituto Português do Mar e da Atmosfera Lisboa, Portugal

Abstract. Extensive, longstanding dry and wet episodes are one of the most frequent climatic extreme events in the Iberian Peninsula. Here, we present a method for ranking regional extremes of persistent, widespread drought and wet events, considering different time scales. The method is based on the multiscalar Standardized Precipitation Evapotranspiration Index (SPEI) gridded dataset for the Iberian Peninsula. SPEI was computed using the Climatic Research Unit (CRU) between 1901 and 2016 using a log-logistic probability distribution function. The Potential Evapotranspiration (PET) was computed through the Penmann-Monteith equation. The ranking classification method is based on the evaluation of the magnitude of an event, which is obtained after considering both the area affected respectively by the dryness or wetness – defined by SPEI values over a certain threshold – and its intensity in each grid point. A sensitivity analysis on the impact of different thresholds to define dry and wet events is performed. A comprehensive dataset of rankings of the most extreme, prolonged, widespread dry and wet periods in the Iberian Peninsula is presented, for aggregated time scales of 6, 12, 18 and 24 months. Results show that in the Iberian Peninsula there is not a region more prone to the occurrence of any of these long-term (dry and/or wet) most extreme events.

Margarida L. R. Liberato et al.

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Margarida L. R. Liberato et al.

Margarida L. R. Liberato et al.

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Short summary
Extensive, longstanding dry and wet episodes are frequent climatic extreme events (EE) in the Iberian Peninsula (IP). A method for ranking regional extremes of persistent, widespread drought and wet events is presented, using different SPEI time scales. Results show (a) there is not a region more prone to these EE occurrence in IP; (b) the most extreme extensive agricultural droughts evolve into hydrological and more persistent extreme droughts; (c) widespread wet and dry EE are anti-correlated.
Extensive, longstanding dry and wet episodes are frequent climatic extreme events (EE) in the...
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