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

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

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...

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主要な著者: Ricaurte-Villota, Constanza, González-Yajimovich, Oscar, Sanchez, Alberto
フォーマット: info:eu-repo/semantics/article
言語:eng
出版事項: Iniversidad Autónoma de Baja California 2013
オンライン･アクセス:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2224
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id repositorioinstitucional-20.500.12930-7454
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spelling repositorioinstitucional-20.500.12930-74542023-05-09T14:30:50Z Coupled response of rainfall and denitrification to solar forcing during the Holocene in Alfonso Basin. Respuesta acoplada de la lluvia y la desnitrificación al forzamiento solar durante el Holoceno en la cuenca Alfonso Ricaurte-Villota, Constanza González-Yajimovich, Oscar Sanchez, Alberto 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.  El registro de δ15N sedimentario de cuenca Alfonso mostró cambios tanto de origen regional, posiblemente asociados con cambios en la señal isotópica del NO3 – en el Agua Subsuperficial Subtropical, como de origen climático, regidos por el forzamiento solar (irradiancia solar total) sobre la intensidad del monzón de Norteamérica (i.e., precipitación pluvial), lo cual provoca suboxia de aguas intermedias y promueve la desnitrificación en la cuenca. Valores altos de δ15N sedimentario (máximo de 14.5‰) coinciden con incrementos de la materia orgánica de origen terrestre (de –14.8% a 49.2%) y con una disminución del porcentaje de terrígenos (de 84.8% a 61.6%) durante el Holoceno medio y tardío, sugiriendo que un aumento en la precipitación y aporte de agua dulce ocasiona un aumento de estratificación de la columna de agua, lo cual inhibe la mezcla vertical y ocasiona la reducción en el contenido de oxígeno en la columna de agua, en una zona ya pobre en oxígeno. 2013-06-01 2021-06-03T03:55:21Z 2021-06-03T03:55:21Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2224 10.7773/cm.v39i2.2224 https://hdl.handle.net/20.500.12930/7454 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2224/1435 application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 39 No. 2 (2013); 151-164 Ciencias Marinas; Vol. 39 Núm. 2 (2013); 151-164 2395-9053 0185-3880
institution Repositorio Institucional
collection DSpace
language eng
description 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. 
format info:eu-repo/semantics/article
author Ricaurte-Villota, Constanza
González-Yajimovich, Oscar
Sanchez, Alberto
spellingShingle Ricaurte-Villota, Constanza
González-Yajimovich, Oscar
Sanchez, Alberto
Coupled response of rainfall and denitrification to solar forcing during the Holocene in Alfonso Basin.
author_facet Ricaurte-Villota, Constanza
González-Yajimovich, Oscar
Sanchez, Alberto
author_sort Ricaurte-Villota, Constanza
title Coupled response of rainfall and denitrification to solar forcing during the Holocene in Alfonso Basin.
title_short Coupled response of rainfall and denitrification to solar forcing during the Holocene in Alfonso Basin.
title_full Coupled response of rainfall and denitrification to solar forcing during the Holocene in Alfonso Basin.
title_fullStr Coupled response of rainfall and denitrification to solar forcing during the Holocene in Alfonso Basin.
title_full_unstemmed Coupled response of rainfall and denitrification to solar forcing during the Holocene in Alfonso Basin.
title_sort coupled response of rainfall and denitrification to solar forcing during the holocene in alfonso basin.
publisher Iniversidad Autónoma de Baja California
publishDate 2013
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2224
_version_ 1792609982290591744

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