Variabilidad climática y la acumulación de carbono orgánico en el sector sur de la Corriente de California durante las etapas isotópicas marinas 1, 2 y 3

The biological pump of the ocean plays a very important role in the global carbon cycle. The burial rates of organic carbon (C_org) south of latitude 40° N in the eastern North Pacific suggest a better preservation of export productivity during the last glacial cycle. The data compiled for the C_org burial rate allowed us to extend the record of marine isotope stages 1, 2 and 3 (MIS 1,2,3) in the eastern North Pacific to the southern sector of the California Current, which corresponds to the Mexican Pacific. The results of the burial rates of C_org show an increase in the export productivity during the MIS-2, excepting for the Mazatlan margin. This evidence suggests there is better nutrient utilization at mid-latitudes during the MIS-2. The increase of nutrient availability to the photic zone, which favored marine and export productivity, was caused by an increase in upwelling intensity.