Person:
Sánchez Benítez, Antonio

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First Name
Antonio
Last Name
Sánchez Benítez
Affiliation
Universidad Complutense de Madrid
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Now showing 1 - 2 of 2
  • Publication
    Análisis de las olas de calor desde una perspectiva langrangiana
    (Universidad Complutense de Madrid, 2021-02-15) Sánchez Benítez, Antonio; García Herrera, Ricardo; Barriopedro Cepero, David
    The global mean temperature has increased by ~1ºC since the preindustrial period (Allen et al., 2018). Global warming is spatially and temporally inhomogeneous, with larger increases for land and specific regions (so-called hot-spots) and seasons, such as the summer warming in the Mediterranean (García-Herrera and Barriopedro, 2018). The increasing trend of mean temperatures has been accompanied by changes in the tails of the distribution, including an increase in the frequency/duration and intensity of heat waves (Acero et al., 2018; Chapman et al., 2019) , as well as the occurrence of new emerging events, also called mega-heat waves. These extreme events, cause severe impacts in socio-economic sectors and population, like extensive crop failures (Fahad et al., 2017), devastating wildfires (Parente et al., 2018), poor air quality (Ordóñez et al., 2010; Rasilla et al., 2019), increased mortality (Kovats and Hajat, 2008), and peaks in energy demand (Newsham and Bowker, 2010)...
  • Publication
    Tracking Iberian heatwaves from a new perspective
    (Elsevier, 2020-06) Sánchez Benítez, Antonio; Barriopedro Cepero, David; García Herrera, Ricardo
    This paper presents a new heatwave (HW) detection algorithm that identifies spatially coherent HW patterns on synoptic scales and their temporal evolution, yielding the main characteristics (extension, intensity or persistence) of HW events (HWEs). The algorithm has been applied to temperature data from the ERA-Interim reanalysis in order to derive a catalogue of Iberian HWEs for the extended summers (June to September) of the 1979–2017 period. The results indicate mean frequencies of five Iberian HWEs and 16 summer days with HW conditions over Iberia (Iberian HWDs), with significant positive trends in both diagnostics. The analysis of the life-cycle reveals that more than half of the HWEs correspond to events that originated within the region. Although Iberian HWEs last more than one week on average, they tend to be transient, persisting for about three days in the region (Iberian phase), where they reach maximum intensity and extension, and evolving later to other areas. In order to identify recurrent patterns of occurrence, a clustering of Iberian HWEs was performed based on their mean temperature fields. Four clusters were obtained: Atlantic, Subtropical, European and Mediterranean events, which display distinctive characteristics and spatio-temporal evolution, causing HW conditions in western, southern, northern and eastern Iberia, respectively. Interestingly, Mediterranean events largely explain the overall trends in Iberian HWEs and HWDs. The connection between Iberian HWEs and atmospheric circulation patterns as summarized in four Weather Regimes (WRs) was also investigated. During the Iberian phase, HWEs are preferentially associated with ridge conditions in western Europe, with small variations in this WR determining different regional HWEs. However, the four types of regional Iberian HWEs tend to occur under different WRs during their pre- and post-Iberian phases, and show different relationships with WRs on seasonal scales. Using an impact-oriented metric for HWEs that accumulates the intensity of HW conditions over the areas affected by the event through its life-cycle, the top 10 Iberian HWEs were identified. They include well-known recent events such as those of August 2003, and June 2017. Flow analogues of the most outstanding Iberian HWEs reveal that recent warming has contributed to double their extension and intensity, making them more exceptional than they would have been in the past.