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Deoxygenation of the water column in the oceans and in the oxygen minimum zone (OMZ) has become relevantdue to its connection with global climate change. The variability of the OMZ has been inferred by in situmeasurements for the last 70 years and qualitatively assessed through the monitoring of trace elements and thenitrogen stable isotope ratio (d15N) of organic matter on several time scales. The V, Ni, Mo and U concentrationsin surface sediments and the dissolved oxygen concentration in the water column of La Paz Bay and the Mazatl´anmargin were used to propose an exponential regression model. This model will allow the inference of the dissolvedoxygen concentration in the sedimentary records from the Alfonso Basin in La Paz Bay and in the Mazatl´anmargin over the last 250 years. Based on this exponential regression model, the dissolved oxygen concentrationincreased by 6.4 µM in the Alfonso Basin and 4.1 µM in the Mazatl´an margin, in the period between 1800 CE andthe present day. This suggests a reoxygenation of the OMZ at the mouth of the Gulf of California. This finding isconsistent with previous studies (Deutsch et al., 2014; Tems et al., 2016), which suggest a reduction in thedeoxygenation of the water column throughout most of the 20th century.

Palabras clave: Trace elements; deoxygenation; Gulf of California; Alfonso Basin; Mazatlan margin

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