Distribution and composition of organic matter in sediments of the oxygen minimum zone of the Northeastern Mexican Pacific: paleoceanographic implications.

Sánchez, Alberto; López-Ortiz, B. Estela; Aguíñiga‐García, Sergio; Balart, Eduardo F.

doi:10.5209/rev_jige.2013.v39.n1.41753

Cited by 19 publications

(8 citation statements)

References 29 publications

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“…Ni C ni N tienen el mismo proceso de diagénesis; sin embargo, la materia orgánica terrestre (más refractaria) es relativamente más fuerte que la materia orgánica marina (más lábil). A pesar de esto, los miembros terminales dan una buena idea de las fuentas principales y dominantes en la región (Aguíñiga et al 2010, Sánchez et al 2013.…”

Section: Materiales Y Métodosunclassified

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

Ricaurte-Villota¹,

González-Yajimovich²,

Sánchez

2013

Cienc. Mar.

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ABSTRACT. The bulk sedimentary δ15 N record of Alfonso Basin displayed changes both from a regional source possibly associated with changes in the isotopic signal of NO 3 -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 δ 15 N (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.Key words: Gulf of California, North American monsoon, laminated sediment record, nitrogen isotopes, Intertropical Convergence Zone. RESUMEN. El registro de δ15 N sedimentario de cuenca Alfonso mostró cambios tanto de origen regional, posiblemente asociados con cambios en la señal isotópica del NO 3 -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 δ 15 N 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.

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Section: Materiales Y Métodosunclassified

“…Neither C nor N have the same process of diagenesis; however, the terrestrial organic matter (more refractory) is relatively stronger than the marine organic matter (more labile). Despite this the end-members give a good idea of the primary and dominant sources in the region (Aguíñiga et al 2010, Sánchez et al 2013). …”

Section: Materiales Y Métodosmentioning

confidence: 99%

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

Ricaurte-Villota¹,

González-Yajimovich²,

Sánchez

2013

Cienc. Mar.

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“…Ventilation processes in SLB are effectively reduced due to the relatively narrow sill that constrains the entrance of already oxygen‐depleted subsurface, subtropical waters emanating from upper intermediate equatorial waters [ van Geen et al ., ]. In addition to this restricted ventilation, the relatively high levels of organic carbon exported from the surface ocean enhance oxidation processes in the subsurface waters that help to maintain the suboxic conditions on the seafloor of this basin (mean [O 2 ] values below 10 µmol/kg [ Sánchez et al ., ]) and hinder bioturbation by benthic organisms on the bottom; all of which help to preserve the laminations in these sediments. The preservation of calcite in these sediments is favored by the exceptionally high sedimentation rates (1 mm yr −1 ) of lithogenic materials, effectively sealing the sediment from bottom waters on relatively short time periods [ van Geen et al ., ].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of carbon paleoproductivity in the Southern California Current System on different time scales for the last 2 ka

Abella-Gutiérrez

Herguera

2016

Paleoceanography

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The San Lázaro Basin (SLB) sediment record is highly sensitive to the El Niño-Southern Oscillation (ENSO) and the Pacific Decadal Oscillation (PDO) due to its location vertically underlying the dynamic boundary between the northern, cooler and fresher waters of the California Current System (CCS) and the southern, warmer and saltier surface waters from the subtropics and tropics. Warm sea surface temperatures (SSTs) and the ensuing stratified surface water column favor carbonate productivity, mostly dominated by the export of coccolithophorids as observed during El Niño events, while cool SSTs and a less stratified water column favor a relatively higher export of organic carbon. Here we show how during the last two millennia, the mechanisms that drive the organic carbon and carbonate export depend on the time scale considered. The organic carbon and carbonate records show opposite trends for the past 2000 years. On multicentennial periodicities, their variability is probably a result of precessional forcing and associated decreasing Northern Hemisphere insolation, which has been shown to affect the migration of the Intertropical Convergence Zone and the polar jet stream. On shorter time scales, interannual to centennial, the SLB records exhibit an ENSO-like variability; similarly, decadal to multidecadal variability is correlated with instrumental and reconstructed PDO records. We further show how interannual variance seems to have increased during the Little Ice Age, most likely related to large ENSO events, in contrast with an apparent reduction in this type of variability between 400 and 1350 Common Era, suggesting a changing sensitivity of the ENSO teleconnection in the southern CCS for the past two millennia. ABELLA-GUTIÉRREZ AND HERGUERA CARBON PALEOPRODUCTIVITY IN THE SOUTHERN CCS 953PUBLICATIONS Paleoceanography

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“…Later the role of carbon isotope effect of photorespiration was recognized as important [22,28] and some researchers have indicated the role of oxygen concentration on photorespiratory function of Rubisco [23,29]. It was shown that low O 2 content caused the observed enrichment of organic matter 12 C [30].…”

Section: Cmentioning

confidence: 99%

Global Photosynthesis and its Regulatory Role in Natural Carbon Cycle

Ивлев¹

2017

J Ecosyst Ecogr

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Main features of global photosynthesis operating in global carbon cycle are considered. Global photosynthesis has all the basic features of normal photosynthesis of C3 type, excepting those that characterize ontogenetic changes. They include: the existence reciprocal processes assimilation and photorespiration, the possession of the key enzyme Rubisco having carboxylase/oxygenase activity, the existence of oscillatory mechanism switching over assimilation to photorespiration and back, carbon isotope fractionation in CO2 assimilation and photorespiration with opposite signs of isotope effects and some others. Considering these features of global photosynthesis, its functioning in global carbon cycle is analyzed. The photosynthetic mechanism forming carbon isotope composition of "living matter" and sedimentary organic matter is suggested. It is shown that environmental conditions of photosynthesis in the location plays a dominant role in forming carbon isotope composition of the above objects. The difference in environmental conditions determines facial isotopic shifts. The analysis of natural isotopic data confirms this conclusion. It allows saying that carbon isotopic difference between oils and organic matter is inherited from the difference between lipid fraction and other part of biomass of "living matter" that was the source of initial biogenic material. It is shown that global photosynthesis performs in global carbon cycle a regulatory role ensuring cycle's movement to the ecological compensation point. The regulatory role is based on the ability of photosynthesizing organisms to respond to the increased oxygen concentration in the course of evolution by reducing assimilation and increasing photorespiration. The achievement of ecological compensation point means that oxygen atmosphere was stabilized and further accumulation of organic matter in the Earth's crust stopped.

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Distribution and composition of organic matter in sediments of the oxygen minimum zone of the Northeastern Mexican Pacific: paleoceanographic implications.

Cited by 19 publications

References 29 publications

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.

Sensitivity of carbon paleoproductivity in the Southern California Current System on different time scales for the last 2 ka

Global Photosynthesis and its Regulatory Role in Natural Carbon Cycle

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