Browsing by Author "Meseguer Ruiz, Oliver"

Now showing 1 - 5 of 5
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    Analysis of the Trends in Observed Extreme Temperatures in Mainland Chile Between 1966 and 2015 Using Different Indices
    (2019) Meseguer Ruiz, Oliver; Corvacho, Oscar; Tapia Tosetti, Alejandro; López Cepeda, José Fabián Cristóbal; Sarricolea, Pablo
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    Comparing SPI and SPEI to detect different precipitation and temperature regimes in Chile throughout the last four decades
    (Elsevier Ltd, 2024) Meseguer Ruiz, Oliver; Serrano Notivoli, Roberto; Aránguiz Acuña, Adriana; Fuentealba Landeros, María Magdalena; Núñez Hidalgo, Ignacio; Sarricolea, Pablo; Garreaud, René
    Droughts are one of the main environmental challenges facing the world this century. The latitudinal and orographic characteristics of continental Chile leads different areas within it to experience very different regimes of precipitation and temperature, resulting in a wide variation in the occurrence and severity of droughts. Using the CR2Met 5 × 5 km resolution gridded monthly dataset covering the years from 1979 to 2019, we calculated the Standardized Precipitation Index (SPI) and the Standardized Precipitation Evaporation Index (SPEI) of March and September at 3-, 6-, 9-, 12- and 24-months to: 1) relate them with different climate modes, and 2) determine their temporal evolution. We found that the Pacific Decadal Oscillation shows low positive correlations with SPI but no significant correlations with SPEI. The Multivariate El Niño Southern Oscillation shows different correlations in northern Chile, as well as El Niño 1 + 2 and the Antarctic Oscillation, for both SPI and SPEI. Both SPI and SPEI show negative (drier) trends in the north and center of Chile, while positive (wetter) trends appear in the south. SPEI shows stronger and more significant negative trends, influenced by the overall warming of the country. Warming trends are lower on the coast, so SPI could be a good indicator for coastal areas, while SPEI could be a good indicator for inland areas. Climate modes are useful for monthly and annual predictions, and by being a good drought predictor, they can help inform key public policies. These results are expected to help Chilean decision makers dealing with the challenges facing water management in the immediate future.
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    Estimating coastal flood hazard of Tossa de Mar, Spain: a combined model - data interviews approach
    (SPRINGER, 2021) Hernandez Mora, Marina; Meseguer Ruiz, Oliver; Karas, Cyrus; Lambert, Fabrice
    Human settlements in coastal areas are highly vulnerable to extreme events, especially in the Mediterranean area, which houses a large number of tourists during the summer and autumn months. It is important to carry out hazard studies at local scale to improve our understanding of natural and anthropogenic processes involved in episodes of coastal flooding. We reconstruct and characterize an extreme weather event in Tossa de Mar (northeastern Spain) and the subsequent urban flooding that occurred in 2008. Our results show flood heights up to 1.27 m, with the maximum occurring between 24 and 64 h after the start of the event. This is broadly consistent with the reconstructions obtained through interviews and photographs. Based on model simulations, we produce a hazard map for the town based on hydrodynamic scenarios for different return periods. We show that the southern part of the town is more susceptible to flooding, whereas the northern part is relatively resilient to extreme events. We recommend the adaption of a currently existing dune by adding vegetation and slightly increasing its height. This low economic cost action would significantly reduce flooding and increase resilience in this area.
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    ¿Hacia un nuevo ciclo extractivista? Revisitando la relación entre comunidades, conflictos e industrias extractivas
    (2021) Irarrázaval Irarrázaval, Felipe; Rojas Rubio, Ignacio; Hidalgo, Rodrigo; Rincón Quiroz, Sasha; Álvarez Naranjo, Juan Camilo; Alvarado Peterson, Voltaire; Fuster Farfán, Xenia; Meseguer Ruiz, Oliver; Lizana Vásquez, Fabián Esteban
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    The 2010-2020 'megadrought' drives reduction in lake surface area in the Andes of central Chile (32 degrees - 36 degrees S)
    (ELSEVIER, 2021) Fuentealba, Magdalena; Bahamondez, Camila; Sarricolea, Pablo; Meseguer Ruiz, Oliver; Latorre, Claudio
    Study region: Andes central Chile (32 degrees S-36 degrees S) / Lakes