Herrera-Becerril C. A., Colas François, Sanchez-Cabeza J. A., Hernández-Ayón J. M., Echevin Vincent, Cardoso-Mohedano J. G., Ruiz-Fernández A. C. (2025). Seasonal and interannual variability of the oxygen minimum zone in the Gulf of California entrance : Insights from high-resolution coupled physical-biogeochemical modelling. Regional Studies in Marine Science, 90, p. 104399 [14 p.]. ISSN 2352-4855.
Titre du document
Seasonal and interannual variability of the oxygen minimum zone in the Gulf of California entrance : Insights from high-resolution coupled physical-biogeochemical modelling
Herrera-Becerril C. A., Colas François, Sanchez-Cabeza J. A., Hernández-Ayón J. M., Echevin Vincent, Cardoso-Mohedano J. G., Ruiz-Fernández A. C.
Source
Regional Studies in Marine Science, 2025,
90, p. 104399 [14 p.] ISSN 2352-4855
The oxygen minimum zone (OMZ) in the Gulf of California entrance (GCE) is a crucial feature of the northeastern tropical Pacific, significantly influencing regional biogeochemical cycles and marine ecosystems. This study investigates the seasonal and interannual variability of the OMZ upper boundaries using a high-resolution physical-biogeochemical coupled model. The model results are evaluated against satellite observations, Argo profiles, and in situ data, demonstrating its capability to capture key dynamical processes, including mesoscale eddies, poleward undercurrents, and coastal-trapped waves (CTWs). The high-resolution CROCO-PISCES model reveals two alternating periods of shoaling and deepening of the OMZ upper boundary in the Gulf of California Entrance, modulated by seasonal mesoscale dynamics and coastal-trapped wave (CTW) propagation. This study provides novel insights into the interannual influence of El Nino Southern Oscillation (ENSO) events on OMZ dynamics, with El Nino driving significant deepening and contraction of the OMZ, and La Nina promoting shoaling and expansion. These variations are linked to changes in mesoscale dynamics, particularly the modulation of anticyclonic circulation at the Gulf's entrance by equatorially forced CTWs associated with ENSO. The study highlights the complex interplay between local and remote oceanographic processes in determining the OMZ variability in the GCE. This research provides insights into the mechanisms driving OMZ dynamics in the Gulf of California and underscores the need for integrated observational and modeling approaches to predict the response of OMZs to ongoing climate variability.
Plan de classement
Sciences fondamentales / Techniques d'analyse et de recherche [020]
;
Ecologie, systèmes aquatiques [036]
Description Géographique
PACIFIQUE NORD ; ETATS UNIS ; CALIFORNIA ; CALIFORNIE GOLFE ; ZONE TROPICALE
