Investigation on the relationship between extratropical cyclones and storm surge events in southern Brazil

Autores/as

DOI:

https://doi.org/10.11606/eISSN.2236-2878.rdg.2024.223533

Palabras clave:

Coastal hazards, Santa Catarina, Severe wave events

Resumen

This study identifies storm surges and examines their association with extratropical cyclones on the Brazilian coast in 2018, with a particular focus on the Itajaí region in Santa Catarina State, Brazil. Extratropical cyclones significantly impact weather and climate, leading to extreme wave events that affect the economy and environment, especially in Brazilian coastal areas. Therefore, this research aims to analyze storm-related cyclone characteristics, genesis areas, and their relationship with storm surges. Storm surges were identified in the time series based on segments where significant wave height (SWH) exceeded 2.5 meters and was sustained for at least 24 hours. This study identified all storm surges that occurred in 2018, providing an overview of these events and the cyclones responsible for generating the waves. The year 2018 was selected to allow a comparison between climate reanalysis data and buoy observations. In that year, 157 extratropical cyclones were identified in the region between Brazil and Argentina. These cyclones did not exhibit a distinct seasonal pattern. A monthly analysis showed that storm surge activity was highest between June and October, with two to three events per month. Wave direction data indicated that the most intense storm surges had a median wave direction from the south/southeast. This suggests a compounded event in which sea level rise is promoted by a cyclone further south, while wave generation occurs due to a cyclone acting closer to the coast. Most cyclones associated with storm surges originated in the La Plata region and along Brazil’s southern and southeastern coast. The results of this study can help improve the prediction and mitigation of coastal hazards, particularly in the context of climate change.

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2024-05-28

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Cómo citar

Gramcianinov, C. B., Aquino, F. E., & Jantsch, M. (2024). Investigation on the relationship between extratropical cyclones and storm surge events in southern Brazil. Revista Do Departamento De Geografia, 44, e223533 . https://doi.org/10.11606/eISSN.2236-2878.rdg.2024.223533