Equatorial Kelvin waves and coastal-trapped waves occurred during El Niño 2015/16 and El Niño Costero 2017 off Peru
comparison between simulations and observations.
DOI:
https://doi.org/10.53554/boletin.v36i2.342Keywords:
Ondas de Kelvin, El Niño costeroAbstract
The frequent arrival of downwelling Kelvin waves in the Eastern Equatorial
Pacific altered the Peruvian Upwelling Ecosystem (PUE) thus affecting the marine ecosystem and hydrology
off Peru. Therefore, we aim to compare the propagation of the Equatorial Kelvin Waves (EKW) during El
Niño 2015/16 and El Niño Costero 2017 (ENC 2017) off Peru through simulation models and observational
data. Our results show that 7 downwelling EKWs (mode 1) propagated along the equator, and then 6 of
them propagated as downwelling Coastal-Trapped Waves (CTW) during EN 2015/16. On the other hand,
during the ENC 2017 off Peru, only one downwelling EKW (mode 1) was propagated. We can conclude that
the downwelling EKWs played a key role in triggering and developing the warming associated with the EN
2015/16 event off Peru, while they had a secondary role during the ENC 2017, just extending the warming,
which was already initiated by other processes.
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