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

Ricaurte-Villota, Constanza; González-Yajimovich, Oscar; Sánchez, Alberto

doi:10.7773/cm.v39i2.2224

Cited by 11 publications

(19 citation statements)

References 44 publications

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“…La mayoría de los procesos biogeoquímicos como la nitrificación, desnitrificación, amonificación, volatilización de amonio y asimilación de N alteran la concentración, forma química y/o la composición isotópica del N en la columna de agua (Valiela et al 1997, Kendall y Cadwell 1998, McClelland y Valiela 1998, Ricaurte-Villota et al 2013. Con base en las variaciones espaciotemporales de T, S, pH y OD, y las formas químicas del N en el sistema, consideramos que los procesos que tienen mayor impacto son la volatilización de amonio y la desnitrificación.…”

Section: Discussionunclassified

“…Most of the biogeochemical processes such as ammonium volatilization, nitrification, denitrification, ammonification, and N assimilation alter the concentration, chemical form, and/or isotopic compostion of N in the water column (Valiela et al 1997, Kendall and Cadwell 1998, McClelland and Valiela 1998, Ricaurte-Villota et al 2013. Based on the spatial and temporal variations of T, S, pH, and DO, and the chemical forms of N in the system, we suggest that the processes that have most impact are ammonium volatilization and denitrification.…”

Section: Discussionmentioning

confidence: 99%

“…El uso de los isótopos estables de N ( 14 N, 15 N) en macroalgas se ha convertido en una herramienta útil para identificar las fuentes de N en los ecosistemas costeros (e.g., Deutsch y Voss 2006, Dailer et al 2010, Kaldy 2011, Ricaurte-Villota et al 2013. La premisa fundamental de la técnica es que las macroalgas expuestas asimilan 15 N en proporción a la disponibilidad y reflejan la fuente de N de una manera predecible (Cohen y Fong 2005).…”

Section: Introductionunclassified

“…Stable N isotopes ( 14 N, 15 N) in macroalgae have become a useful tool for identifying N sources in coastal ecosystems (e.g., Deutsch and Voss 2006, Dailer et al 2010, Kaldy 2011, Ricaurte-Villota et al 2013. The basic premise of the method is that the 15 N of exposed macroalgae reflects the N source in a predictable manner (Cohen and Fong 2005).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of nitrogen sources in the Urias lagoon system, Gulf of California, based on stable isotopes in macroalgae

Izaguirre

Soto-Jiménez

2013

Cienc. Mar.

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in 738 samples of macroalgae collected during one year across the Urías lagoon system (Mazatlán, Sinaloa, Mexico) were analyzed in order to study the N sources. The  15 N-macroalgae premise is that they register and integrate the variability of N and may provide time-integrated information about N pollution. To validate this premise, we applied two models to predict the isotopic variability of N available in the water column ( 15 N-DIN): one is based on a physical mixing balance of N sources (simple model), and the second includes the effects of the biogeochemical processes on the signals (coupled model, CM). Both models showed significant R 2 , but CM better explained the  15 N-DIN variability. The relation between δ 15 N-DIN CM and δ 15 N-macroalgae also showed a good fit, although lower than expected and with higher dispersion. The multiple N sources and co-occurring biogeochemical reactions, which produce a mixture of chemical species of N and of their isotopic compositions, as well as the high diversity of species (45) explained the elevated variability and lack of fit. Even so,  15 N in macroalgae is the most useful available tool to quantify the relative contributions of N to ecosystems from different sources. Based on Bayesian isotopic mixing models, the main anthropogenic sources of N to the Urías lagoonal system were domestic effluents (50%), atmospheric deposition (24%), and seafood processing plant effluents (21%), and to a lesser extent, aquaculture effluents (3%), agriculture runoff (1%), and oceanic N (1%).Key words: δ 15 N, eutrophication, biogeochemical cycle, NLOAD model, MixSIR. RESUMEN. Las concentraciones de las formas químicas de nitrógeno (N) y su composición isotópica en la columna de agua y las señales deδ 15 N en 738 muestras de macroalgas recolectadas durante un año en el sistema lagunar de Urías (Mazatlán, Sinaloa, México) fueron analizadas para estimar las fuentes de N. La premisa sobre el uso de  15 N en macroalgas es que las macroalgas asimilan 15 N en proporción a la disponibilidad y reflejan la fuente de N de una manera predecible. Para validar esta premisa, se aplicaron dos modelos para la predicción de la variabilidad isotópica del N en el agua ( 15 N-NID): el primero se basa en una mezcla física de las fuentes de N (modelo simple), y el segundo integra los efectos de procesos biogeoquímicos sobre sus señales isotópicas (modelo acoplado, MA). Ambos modelos mostraron valores de R 2 significativos, pero el MA explicó mejor la variabilidad del δ 15 N-NID. La relación entre δ 15 N-NID MA y δ 15 N-macroalgas también mostró un buen ajuste, aunque menor al esperado y con una alta dispersión. Las múltiples fuentes de N y reacciones biogeoquímicas concurrentes, que producen una mezcla compleja de especies químicas de N y de sus composiciones isotópicas, además de la alta diversidad de especies (45), explicaron la elevada variabilidad y la falta de ajuste. Aun así, la técnica de  15 N en macroalgas es la herramienta más útil que existe para cuantificar las contribuciones relativas...

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Section: Discussionunclassified

Section: Discussionmentioning

confidence: 99%

Section: Introductionunclassified

Section: Introductionmentioning

confidence: 99%

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Evaluation of nitrogen sources in the Urias lagoon system, Gulf of California, based on stable isotopes in macroalgae

Izaguirre

Soto-Jiménez

2013

Cienc. Mar.

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“…Oceanographic conditions in the tropical northwestern Pacific respond with different frequency and intensity to the variability of tropical weather events (Barron et al 2003, Goni et al 2006, Barron and Bukry 2007, Flores-Trujillo et al 2009, Staines-Urías et al 2009, Marchitto et al 2010, Pérez-Cruz 2013, Ricaurte-Villota et al 2013. The variability of marine productivity in the northwestern Pacific during the Holocene has been linked to the following: (1) the position of the subtropical high pressure system (e.g., Goni et al 2006, Pérez-Cruz 2013; (2) the relative position of the Intertropical Convergence Zone (ITCZ) and the North American Monsoon (e.g., Goni et al 2006, Staines-Urías et al 2009, Pérez-Cruz 2013, Ricaurte-Villota et al 2013; and (3) solar activity, an exogenous factor responsible for El Niño/La Niña-like atmospheric and oceanographic conditions (e.g., Marchitto et al 2010).…”

Section: Introductionmentioning

confidence: 99%

Variability of marine biological productivity in the northeastern Pacific over the past millennium

Juárez¹,

Sánchez²,

González-Yajimovich³

2015

Cienc. Mar.

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ABSTRACT. In this study we present new data of biogenic opal (BO), organic carbon (OC), and calcium carbonate (CaCO 3 ) in a highresolution record from the western coast of Baja California Sur, Mexico. The variability of marine biological productivity in this area is dominated by El Niño and La Niña events on different time scales. The BO and OC contents showed a decrease between AD 1100 and 1400. From AD 1400 to the present, BO and OC showed a significant increase, indicating permanent upwelling conditions. The CaCO 3 content showed an inverse correlation with OC, which suggests that the exported OC fluxes are a significant factor controlling CaCO 3 dissolution in the sediment. The increase in BO and OC was synchronic with a decline in the number of El Niño events (6 ± 4 every 100 years) over the last 600 years of the millennium.Key words: biogenic opal, organic carbon, El Niño, La Niña, upwelling. RESUMEN.En este trabajo se presentan nuevos datos de un registro de alta resolución de ópalo biogénico (OB), carbono orgánico (CO) y carbonato de calcio (CaCO 3 ) en la costa occidental de Baja California Sur, México. En esta región, la variabilidad de la productividad biológica marina es dominada por la intensidad de los eventos El Niño y La Niña en diversas escalas de tiempo. Los contenidos de OB y CO disminuyeron durante el periodo de AD 1100 a 1400. En el periodo de AD 1400 al presente, el OB y CO aumentaron significativamente, lo cual indica condiciones permanentes de surgencia. El contenido de CaCO 3 se correlacionó inversamente con el CO, y esto sugiere que los flujos de CO exportado son un factor significativo que controla la disolución de CaCO 3 en el sedimento. El incremento en el OB y CO fue sincrónico con la disminución en el número de eventos de El Niño (6 ± 4 cada 100 años) para los últimos 600 años del milenio.Palabras clave: ópalo biogénico, carbono orgánico, El Niño, La Niña, surgencia.

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Decadal to centennial fluctuations in the intensity of the eastern tropical North Pacific oxygen minimum zone during the last 1200 years

et al. 2016

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Oxygen minimum zones (OMZs), located below highly productive marine regions, are sites of microbially mediated denitrification and biogeochemical cycling that have global significance. The intensity of OMZs fluctuates naturally; however, the degree of these fluctuations and a comprehensive understanding of the factors that drive these fluctuations on decadal to centennial time scales is lacking. Our high-resolution (near-annual) record of δ 15 N sed from laminated sediments at the Pescadero Slope in the Gulf of California (eastern tropical North Pacific) fluctuates between maximum values of 10.5‰ and minimum values of 8.0‰ over the past 1200 years. An analysis of the relationship between δ 15 NO 3 À and [O 2 ] in the water column suggests that the observed range of δ 15 N sed values is equivalent to an approximately 8 μM fluctuation in O 2 content and that these changes can occur in less than 25 years. Our findings show that the OMZ typically intensifies quickly and contracts gradually; the average rate of OMZ intensification (À0.24 μM O 2 /yr) is twice as fast as the rate of OMZ reoxygenation. Spectral analyses of the δ 15 N sed record and Br/Cl counts, with the latter are used as a proxy for organic carbon preservation, suggest that the Pacific Decadal Oscillation and the Suess (deVries) solar cycle (solar irradiance) may influence the intensity of the OMZ and carbon production/export during the late Holocene. Coherence between δ 15 N sed and weight percent organic carbon also suggests that similar mechanisms influence both OMZ fluctuations and variation in organic carbon production/export.

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

Cited by 11 publications

References 44 publications

Evaluation of nitrogen sources in the Urias lagoon system, Gulf of California, based on stable isotopes in macroalgae

Evaluation of nitrogen sources in the Urias lagoon system, Gulf of California, based on stable isotopes in macroalgae

Variability of marine biological productivity in the northeastern Pacific over the past millennium

Decadal to centennial fluctuations in the intensity of the eastern tropical North Pacific oxygen minimum zone during the last 1200 years

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