Articles | Volume 17, issue 5
https://doi.org/10.5194/os-17-1385-2021
https://doi.org/10.5194/os-17-1385-2021
Research article
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06 Oct 2021
Research article | Highlight paper |  | 06 Oct 2021

Interannual variability in contributions of the Equatorial Undercurrent (EUC) to Peruvian upwelling source water

Gandy Maria Rosales Quintana, Robert Marsh, and Luis Alfredo Icochea Salas

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Cited articles

Ballón, M., Wosnitza-Mendo, C., Guevara-Carrasco, R., and Bertrand, A.: The impact of overfishing and El Niño on the condition factor and reproductive success of Peruvian hake, Merluccius gayi peruanus, Prog. Oceanogr., 79, 300–307, https://doi.org/10.1016/j.pocean.2008.10.016, 2008. a
Benites, C. and Barriga, E.: La Poblacion de la merluza durante el verano 2004, Crucero BIC Olaya 0401-02, Tech. rep., Instituto del Mar del Peru, Callao, ISSN 0378-7702, 2011. a
Blaker, A. T., Hirschi, J. J., McCarthy, G., Sinha, B., Taws, S., Marsh, R., Coward, A., and de Cuevas, B.: Historical analogues of the recent extreme minima observed in the Atlantic meridional overturning circulation at 26 N, Clim. Dynam., 44, 457–473, https://doi.org/10.1007/s00382-014-2274-6, 2015. a
Blanke, B. and Grima, N.: ARIANE software for tracking particles [code], available at: http://stockage.univ-brest.fr/~grima/Ariane/ariane.html (last access: 20 February 2021), 2018. a
Blanke, B. and Raynaud, S.: Kinematics of the Pacific Equatorial Undercurrent: An Eulerian and Lagrangian approach from GCM results, J. Phys. Oceanogr., 27, 1038–1053, https://doi.org/10.1175/1520-0485(1997)027<1038:KOTPEU>2.0.CO;2, 1997. a, b, c
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Short summary
The Equatorial Undercurrent (EUC) is a key influence on upwelling of nutrient-rich waters associated ecosystems off Peru. To quantify this influence, we backtrack upwelling waters in a computer model of ocean currents, annually, over 1989–2007. The EUC influence varies from year to year, dominating in warm El Niño years, when the EUC extends much closer to the Peruvian coast. In other years, more local upwelling is associated with coastal winds, coincident with major key population shifts.