Boletín de la Sociedad Geológica Mexicana
versión On-line ISSN 1405-3322
SANCHEZ, Alberto; CARRIQUIRY, José D. y LOPEZ-ORTIZ, B. Estela. Climatic variability and organic carbon accumulation in the southern part of the California Current during marine isotopic stages 1, 2 and 3. Bol. Soc. Geol. Mex [online]. 2010, vol.62, n.3, pp. 391-398. ISSN 1405-3322.
The biological pump of the ocean plays a very important role in the global carbon cycle. The burial rates of organic carbon (Corg) 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 Corg 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 Corg 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.
Palabras llave : California current; organic carbon; biological pump; export productivity; marine isotope stages.