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Preprints
https://doi.org/10.5194/egusphere-2022-763
https://doi.org/10.5194/egusphere-2022-763
17 Aug 2022
 | 17 Aug 2022

Effect of extreme El Niño events on the precipitations of Ecuador

Dirk Thielen, Paolo Ramoni-Perazzi, Mary L. Puche, Marco Marquez, José I. Quintero, Wilmer Rojas, Alberto Quintero, Guillermo Bianchi, Irma A. Soto-Werschitz, and Marco Aurelio Arizapana-Almonacid

Abstract. Extreme El Niño events stand out not only for their powerful impacts but also because they are significantly different from other El Niños. In Ecuador, such events are accountable for impacting negatively the economy, infrastructure, and population. Spatial-temporal dynamics of precipitation anomalies from various types of extreme El Niño events are analyzed and compared. Results show that for Eastern Pacific and Coastal El Niño types, most precipitation extremes occur in the first half of the second year of the event. Any significant difference between events becomes more evident at this stage. Spatially, for any event, 50 % of all extreme anomalies occurred at elevations <150 m. Difference between events was significant when considering the altitude when reaching 80 % of all extreme anomalies: EP-EN 97/98 at 500 m, COA-EN 17 at 800 m, and EN 82/83 at 1000 m. Nevertheless, in some sectors of the Andean Cordillera, the ENSO signal could be detected at 3200–3900 m. Distance to coastline and steepness of relief may play determining role. At lowlands, anomalies are most severe in regions where seasonality index is the highest. These results are useful at different decision-making levels for identifying most appropriate practices reducing vulnerability from a potential increase in extreme El Niño frequency and intensity.

Publisher's note: Copernicus Publications remains neutral with regard to jurisdictional claims made in the text, published maps, institutional affiliations, or any other geographical representation in this preprint. The responsibility to include appropriate place names lies with the authors.
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Journal article(s) based on this preprint

24 Apr 2023
Effect of extreme El Niño events on the precipitation of Ecuador
Dirk R. Thielen, Paolo Ramoni-Perazzi, Ezequiel Zamora-Ledezma, Mary L. Puche, Marco Marquez, José I. Quintero, Wilmer Rojas, Alberto Quintero, Guillermo Bianchi, Irma A. Soto-Werschitz, and Marco Aurelio Arizapana-Almonacid
Nat. Hazards Earth Syst. Sci., 23, 1507–1527, https://doi.org/10.5194/nhess-23-1507-2023,https://doi.org/10.5194/nhess-23-1507-2023, 2023
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The requested preprint has a corresponding peer-reviewed final revised paper. You are encouraged to refer to the final revised version.

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Extreme El Niño events are significantly different from other El Niños, standing out for their...
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