López-Aviles, B., E., Beier, R., Duran, J., Gómez-Valdes, R., Castro & L., Sánchez-Velasco (2024). The California current system off Baja California Sur. Progress in Oceanography. 222: 103225. DOI: https://doi.org/10.1016/j.pocean.2024.103225.
Brandon López-Aviles 1, Emilio Beier 2, Rodrigo Duran 3, José Gómez-Valdes 1, Rubén Castro 4 y Laura Sánchez-Velasco 5
Based on hydrographic data from twocruises (June 2010 and May 2012) off Baja California Sur, Mexico, historical in situ measurements from theWorld Ocean Database 2018, California Cooperative Oceanic FisheriesInvestigations, and Investigaciones Mexicanas de la Corriente de Californiacruise programs, as well as satellite images and data from the GlobalReanalysis, this study describes the California Current System off BajaCalifornia Sur. The California Current System is characterized by theinteraction of four near-surface currents. Far from the coast, the CaliforniaCurrent flows within the North Pacific Subtropical Gyre but does not reach thePacific Tropical-Subtropical Convergence off Mexico. From December to June, anequatorward flow known as the Tropical Branch of California Current emergesalong the coast. This flow intensifies from March to June and is closelyrelated to the mass flux induced by coastal upwelling. In July, a new branch ofthe Tropical Branch of the California Current turns poleward along the BajaCalifornia Sur coast. This flow is often referred to as the California Surface Countercurrent becauseit flows in the opposite direction to the California Current. Additionally, theCalifornia Undercurrent is detected, influencing the water column from 100 to900 m, with a maximum poleward flow between 200 m and 300 m, decreasingtoward the surface. The California Undercurrent persists throughout the yearover the continental slope, displaying a significant semiannual component around the Gulf ofCalifornia entrance. The California Current System off Baja California Surplays a crucial role in the formation of Transitional Waters within the PacificTropical-Subtropical Convergence off Mexico. The importance of equatorward flowsby the Tropical Branch of California Current in ventilating the Oxygen MinimumZone waters in the Central Pacific offMexico is emphasized.
Palabras clave: California current system; Baja California Sur; Volume transport; GLORYS
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