Coupled response of rainfall and denitrification to solar forcing during the Holocene in Alfonso Basin.

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Constanza Ricaurte-Villota
Oscar González-Yajimovich
Alberto Sanchez

Abstract

The bulk sedimentary δ15N record of Alfonso Basin displayed changes both from a regional source possibly associated with changes in the isotopic signal of NO3 dissolved in Subsurface Subtropical Water and from a climate source governed by solar forcing (total solar irradiance) over the strength of the North American monsoon (i.e., rainfall), causing intermediate water suboxia and promoting denitrification in the basin. High values of bulk sedimentary δ15N (maximum of 14.5‰) agree with increases in land-derived organic matter (from –14.8% to 49.2%) and with a decrease in terrigenous percentage (from 84.8% to 61.6%) during the Middle and Late Holocene, suggesting that increased rainfall and freshwater input promotes increased stratification of the water column, which inhibits vertical mixing and produces a reduction in oxygen content in an already oxygen-poor zone. 

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How to Cite
Ricaurte-Villota, C., González-Yajimovich, O., & Sanchez, A. (2013). Coupled response of rainfall and denitrification to solar forcing during the Holocene in Alfonso Basin. Ciencias Marinas, 39(2), 151–164. https://doi.org/10.7773/cm.v39i2.2224
Section
Research Article
Author Biographies

Constanza Ricaurte-Villota, Universidad Autónoma de Baja California

Estudiante de Doctorado en Oceanografía Costera

Oscar González-Yajimovich, Universidad Autónoma de Baja California

Departamento de Geología Profesor/Investigador Titular C

Alberto Sanchez, Centro Interdisciplinario de Ciencias Marinas del Instituto Politécnico Nacional

Profesor Titular "B"

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