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

Constanza Ricaurte-Villota; Oscar González-Yajimovich; Alberto Sanchez

doi:10.7773/cm.v39i2.2224

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

Translated title of the contribution: Coupled response of rainfall and denitrification to solar forcing during the Holocene in Alfonso Basin

Constanza Ricaurte-Villota, Oscar González-Yajimovich, Alberto Sanchez

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

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.

Translated title of the contribution	Coupled response of rainfall and denitrification to solar forcing during the Holocene in Alfonso Basin
Original language	English
Pages (from-to)	151-164
Number of pages	14
Journal	Ciencias Marinas
Volume	39
Issue number	2
DOIs	https://doi.org/10.7773/cm.v39i2.2224
State	Published - 2013
Externally published	Yes

Keywords

Gulf of California
Intertropical Convergence Zone
Laminated sediment record
Nitrogen isotopes
North American monsoon

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10.7773/cm.v39i2.2224

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title = "Coupled response of rainfall and denitrification to solar forcing during the Holocene in Alfonso Basin",

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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doi = "10.7773/cm.v39i2.2224",

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T1 - Coupled response of rainfall and denitrification to solar forcing during the Holocene in Alfonso Basin

AU - Ricaurte-Villota, Constanza

AU - González-Yajimovich, Oscar

AU - Sanchez, Alberto

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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.

KW - Gulf of California

KW - Intertropical Convergence Zone

KW - Laminated sediment record

KW - Nitrogen isotopes

KW - North American monsoon

UR - http://www.scopus.com/inward/record.url?scp=84879522694&partnerID=8YFLogxK

U2 - 10.7773/cm.v39i2.2224

DO - 10.7773/cm.v39i2.2224

M3 - Artículo

AN - SCOPUS:84879522694

SN - 0185-3880

VL - 39

SP - 151

EP - 164

JO - Ciencias Marinas

JF - Ciencias Marinas

IS - 2

ER -

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

Abstract

Keywords

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