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BOLETÍN DE LA SOCIEDAD GEOLÓGICA MEXICANA
http://dx.doi.org/10.18268/BSGM2010v62n3a6 |
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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
Alberto Sánchez1,*, José D. Carriquiry2, B. Estela López-Ortiz1
1Centro Interdisciplinario de Ciencias Marinas, Departamento de Oceanología, Instituto Politécnico Nacional, La Paz, Baja California Sur, México.
2Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California, Ensenada, Baja California, México.
*This email address is being protected from spambots. You need JavaScript enabled to view it.; This email address is being protected from spambots. You need JavaScript enabled to view it.
Abstract
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 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.
Keywords: California current, organic carbon, biological pump, export productivity, marine isotope stages.
