Variabilidad climática de eventos compuestos cálidos y secos en el sur de Sudamérica
Keywords:
climatología extrema, eventos extremos de temperatura, precipitaciónAbstract
En este trabajo se estudió la variabilidad espacio-temporal de eventos compuestos cálidos y secos en el sur de Sudamérica entre 1979 y 2018. Se exploró la ocurrencia simultánea y secuencial de olas de calor y sequı́as durante la estación cálida (octubre a marzo) utilizando la temperatura máxima y el ı́ndice de Precipitación Estandarizado (SPI) de 132 estaciones meteorológicas. Los resultados muestran que los eventos ocurren con una mayor frecuencia en el centro y noreste de Argentina. Además, en los casos secuenciales también se identificaron frecuencias máximas de olas de calor en el sur de Chile y la Patagonia oeste. Al dividir el periodo en dos subperiodos (1979-1998 y 1999-2018), se encontró que la frecuencia de eventos aumentó en más del doble en el perı́odo más reciente en algunas estaciones del norte de Argentina, Chile, Paraguay y Brasil. La comparación entre periodos también reveló un aumento en la extensión espacial de ambos tipos de eventos, especialmente en los simultáneos. Por último, el análisis de la variabilidad interanual evidenció un aumento significativo en el número de dı́as involucrados en una ola de calor seca secuencial.
Downloads
References
Leonard, M., Westra, S., Phatak, A., & et al. (2014). A compound event framework for understanding extreme impacts. WIREs Clim Change, 5, 113–128. https://doi.org/10.1002/wcc.252
Seneviratne, S. I., Nicholls, N., Easterling, D. R., & et al. (2012). Changes in climate extremes and their impacts on the natural physical environment. Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation: A Special Report of Working Groups I and II of the IPCC, 109–230.
Zscheischler, J., Westra, S., van den Hurk, B. J. J. M., & et al. (2018). Future climate risk from compound events. Nature Climate Change, 8, 469–477. https://doi.org/10.1038/s41558-018-0156-3
Downloads
Published
Issue
Section
License
Copyright (c) 2025 Agustina Lopez-Ramirez, Mariana Barrucand, Soledad Collazo
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
Starting in 2022 (Vol. 43 number 2) articles will be published in the journal under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International license (CC BY-NC-SA 4.0)
According to these terms, the material can be shared (copied and redistributed in any medium or format) and adapted (remixed, transformed and created from the material another work), provided that a) the authorship and the original source of its publication (journal and URL of the work), b) is not used for commercial purposes and c) the same license terms are maintained.
Prior to this date the articles were published in the journal under a Creative Commons Attribution license (CC BY)
In both cases, the acceptance of the originals by the journal implies the non-exclusive assignment of the economic rights of the authors in favor of the editor, who allows reuse, after editing (postprint), under the license that corresponds according to the edition.
Such assignment means, on the one hand, that after its publication (postprint) in the GEOACTA Magazine of the Association of Geophysicists and Geodesists, the authors can publish their work in any language, medium and format (in such cases, it is requested that it be recorded that the material was originally published in this journal); on the other, the authorization of the authors for the work to be harvested by SEDICI, the institutional repository of the National University of La Plata, and to be disseminated in the databases that the editorial team considers appropriate to increase visibility. of the publication and its authors.
Likewise, the journal encourages the authors so that after their publication in the Journal of the Association of Geophysicists and Geodesists, they deposit their productions in other institutional and thematic repositories, under the principle that offering society scientific production and Unrestricted academic scholarship contributes to a greater exchange of global knowledge.
