Influence of Santa Ana winds on the surface circulation of Todos Santos Bay, Baja California, Mexico

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Luis Felipe Navarro-Olache
Rubén Castro
Reginaldo Durazo
Rafael Hernández-Walls
Adán Mejía-Trejo
Xavier Flores-Vidal
Ana Laura Flores-Morales

Abstract

The influence of easterly and northeasterly dry and warm Santa Ana winds (SAw) on the surface circulation of Todos Santos Bay, Mexico, is studied from surface currents and wind data measured during the most extreme periods of activity (autumn-winter season). Sea surface currents were measured using a system of coastally-based HF radar stations between 2009 and 2015. Winter-mean surface circulation showed a cyclonic tendency. Atmospheric variables allowed the grouping of ~122 SAw events, 23% of which caused a noticeable change in the background circulation. Event-mean current patterns showed dissimilar responses to the acting winds, with some SAw events driving weak offshore currents, another that developed an eddy-pair circulation inside the bay, and one rather intense (winds of 8-10 m s–1) that developed a clockwise circulation overturning the cyclonic long-term winter-mean. In general, changes in the circulation were related to an offshore transport of surface waters into the open ocean.

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Author Biographies

Luis Felipe Navarro-Olache, Universidad Autonoma de Baja California

Instituto de Investigaciones Oceanologicas

Rubén Castro, Universidad Autonoma de Baja California

Facultad de Ciencias Marinas

Reginaldo Durazo, Universidad Autonoma de Baja California

Facultad de Ciencias Marinas

Rafael Hernández-Walls, Universidad Autonoma de Baja California

Facultad de Ciencias Marinas

Adán Mejía-Trejo, Universidad Autonoma de Baja California

Facultad de Ciencias Marinas

Xavier Flores-Vidal, Universidad Autonoma de Baja California

Instituto de Investigaciones Oceanologicas

Ana Laura Flores-Morales, Universidad Autonoma de Baja California

Facultad de Ciencias Marinas

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