Dissolved iron distributions in the central region of the Gulf of California, México

Segovia-Zavala, J.A.; Lares, María; Delgadillo‐Hinojosa, Francisco; Tovar-Sánchez, Antonio; Sañudo‐Wilhelmy, Sergio A.

doi:10.1016/j.dsr.2009.10.007

Cited by 16 publications

(43 citation statements)

References 58 publications

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“…In the central GC, Fe concentration changes with depth show a typical nutrient profile with surface depletion and enrichment at depths. Importantly, Fe is almost completely depleted in the first 50 m below the surface due to biological utilization [ Segovia‐Zavala et al , 2010]. In addition, the ratio between Fe and essential macronutrients in deep and subsurface waters remain below biological requirements suggesting additional sources of iron to the sea surface will be required to sustain high levels of primary productivity [ Brand , 1991; Dutkiewicz et al , 2005].…”

Section: Silicic Acid Cycling In the Modern Guaymas Basinmentioning

confidence: 99%

Silicic acid biogeochemistry in the Gulf of California: Insights from sedimentary Si isotopes

Pichevin¹,

Ganeshram²,

Reynolds³

et al. 2012

Paleoceanography

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[1] Iron is considered to play a large role in the cycling of Si in Fe-limited regions of the ocean, but little is known about its role in Si biogeochemistry outside these areas. Here, we present published sediment trap data, new nutrient profiles and high resolution sedimentary records (Si isotopes, Biogenic silica%, N% and C%) from the Gulf of California, a non-Fe-limited region, to investigate the history of Si cycling in this highly productive basin. Modern nutrient profiles show that silicic acid in subsurface waters is in excess relative to nitrate and is therefore incompletely utilized during moderate winter upwelling events. Modern data, however, suggest that during intense upwelling episodes, silicic acid is preferentially utilized relative to nitrate by the biota, which we suggest reflects transient iron limitation. Our new d 30 Si record from the Guaymas Basin shows dramatic variations at millennial timescales. Low d 30 Si values synchronous with Heinrich events are interpreted as resulting from the decline in Si(OH) 4 utilization at times of decreased upwelling strength, while nearly complete Si(OH) 4 utilization was observed at times of invigorated upwelling and increased opal burial during the Holocene, the Bølling-Allerød and the last glacial period. We attribute the complete utilization of Si(OH) 4 to the occurrence of transient Fe limitation at these times. Our study highlights the importance of Fe limitation on Si and C cycling in coastal upwelling regions and suggests that upwelling dynamics, in combination with Fe availability, have the potential to modulate marine Si distribution and opal burial even at short timescales.

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Section: Silicic Acid Cycling In the Modern Guaymas Basinmentioning

confidence: 99%

Silicic acid biogeochemistry in the Gulf of California: Insights from sedimentary Si isotopes

Pichevin¹,

Ganeshram²,

Reynolds³

et al. 2012

Paleoceanography

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“…En la región central del GC, la mezcla vertical asociada a la marea juega un papel relevante en controlar la estructura de la columna de agua (e.g., Simpson et al 1994, Argote et al 1995, el contenido de calor (Paden et al 1991(Paden et al , 1993, la intensidad de los procesos biológicos (e.g., y la composición química de sus aguas (Álvarez-Borrego et al 1978;Delgadillo-Hinojosa et al 2001Hernández-Ayón et al 2007;Segovia-Zavala et al 2010;2011). La distribución vertical de los nutrientes registrados en este trabajo sugiere que la mezcla vertical de la columna de agua ejerce un efecto directo sobre la forma del perfil y controla la concentración promedio de los nutrientes en la capa superficial del CB.…”

Section: Influencia De La Mezcla Vertical Sobre La Concentración Y Launclassified

“…In the central GC, tide-related vertical mixing plays an important role in controlling the water column structure (e.g., Simpson et al 1994, Argote et al 1995, heat content (Paden et al 1991(Paden et al , 1993, intensity of biological processes (e.g., Gaxiola-Castro et al 1995), and chemical composition of the waters (Álvarez-Borrego et al 1978;DelgadilloHinojosa et al 2001DelgadilloHinojosa et al , 2006Hernández-Ayón et al 2007;Segovia-Zavala et al 2010, 2011. The vertical distribution of nutrients reported herein suggests that vertical mixing of the water column has a direct effect on the shape of the profile and controls mean nutrient concentrations in the surface layer of BC.…”

Section: Influence Of Vertical Mixing On the Vertical Distribution Anmentioning

confidence: 99%

Wintertime enrichment of inorganic nutrients in the Ballenas Channel, Gulf of California

Torres-Delgado¹,

Delgadillo‐Hinojosa²,

Camacho-Ibar³

et al. 2013

Cienc. Mar.

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), and low values in summer (7.1 ± 1.0 M NO 3 , 1.22 ± 0.06 M PO 4 , and 16.0 ± 2.1 M Si(OH) 4 ), related to vertically stratified water column conditions ( = 150-223 J m -3 ). In contrast, below 200 m the seasonal variability of the three nutrient concentrations was reduced. The hydrographic analysis indicated that the wintertime surface nutrient enrichment was due to an intensification of the water column mixing, which vertically transported Subtropical Subsurface Water (SSW, cold and nutrient-enriched) to the surface of BC. In contrast, nutrient impoverishment in summertime was due to biological consumption combined with the stratification of the water column, which reduced the vertical flow of SSW and, consequently, the supply of nutrients to the surface of this system. The N:P and Si:N ratios and an excess of PO 4 > 0.65 M in surface waters indicated that NO 3 was the potential limiting nutrient for primary production in this oceanographic province of the Gulf of California.Key words: nutrients, enrichment, vertical mixing, Ballenas Channel. RESUMEN.Se realizaron tres cruceros oceanográficos en la región del canal de Ballenas (CB) durante el invierno de 2002, la primavera de 2003 y el verano de 2004, con el objetivo de estudiar el impacto de la mezcla vertical de la columna de agua () sobre la concentración superficial de los nutrientes inorgánicos disueltos (NO 3 , PO 4 y Si(OH) 4 ). Las concentraciones promedio de nutrientes integrados en los primeros 100 m del CB mostraron una clara variación estacional, con valores altos en el invierno (18.2 ± 1.1 M de NO 3 , 2.36 ± 0.08 M de PO 4 y 35.4 ± 3.2 M de Si(OH) 4 ), asociados a condiciones de mezcla intensa de la columna de agua ( = 0.7-16 J m -3 ), y valores bajos en el verano (7.1  1.0 M de NO 3, 1.22 ± 0.06 M de PO 4 y 16.0 ± 2.1 M de Si(OH) 4 ), asociados a condiciones de estratificación de la columna de agua ( = 150-223 J m -3 ). En contraste, por debajo de los 200 m la variabilidad estacional de la concentración de los tres nutrientes fue muy pequeña. El análisis hidrográfico indicó que el enriquecimiento superficial de nutrientes en invierno se debió a la intensificación de la mezcla de la columna de agua, la cual transportó verticalmente el Agua Subsuperficial Subtropical (ASS, fría y rica en nutrientes) hacia la superficie del CB. En contraste, el empobrecimiento de nutrientes durante el verano se debió a que el consumo por la actividad biológica se combinó con la estratificación de la columna de agua, la cual redujo el flujo vertical del ASS y, en consecuencia, el aporte de nutrientes hacia la superficie de este sistema. Las razones N:P, Si:N y un exceso de PO 4 > 0.65 M en las aguas superficiales indicaron que el NO 3 fue el nutriente potencialmente limitante para la producción primaria de esta provincia oceanográfica del golfo de California.Palabras clave: nutrientes, enriquecimiento, mezcla vertical, canal de Ballenas.

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“…Regarding the potential implications of the dust deposition in surface waters of adjacent seas, if the particles contains Fe, Cu, or Cd, these metals may affect primary production [65][66][67], as they play a key role in biogeochemical processes such as photosynthesis [68]. Studies on dissolved Fe suggest that it may be a limiting element for primary production [20].…”

Section: Discussionmentioning

confidence: 99%

The Baja California Peninsula, a Significant Source of Dust in Northwest Mexico

et al. 2019

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Despite their impacts on ecosystems, climate, and human health, atmospheric emissions of mineral dust from deserts have been scarcely studied. This work estimated dust emission flux (E) between 1979 and 2014 from two desert regions in the Baja California Peninsula (BCP) using a modified dust parameterization scheme. Subsequently, we evaluated the processes controlling the variability of E at intra- and interannual scales. During the period 1979–2014 peak E were generally recorded in summer (San Felipe) and spring (Vizcaino), and the lowest emissions occurred in autumn (San Felipe) and winter (Vizcaíno). Intra- and interannual variability in E was associated with fluctuations in wind speed and direction, precipitation, and soil moisture, which, in turn, were controlled by the seasonal displacement of the North Pacific high-pressure center. Key drivers of the interannual variability of E are strong El Niño Southern Oscillation (ENSO) events. These climatic events and the hydrometeorological variables mentioned above played a major role in the onset and occurrence of dust events, with the highest annual emissions at Vizcaíno. Besides, a lag of 19 months (San Felipe) and 21 months (Vizcaino) was recorded between the occurrence of relevant E and ENSO events, apparently in response to the effect of this climatic event on precipitation. The climate variability of E in both desert regions was evidenced by the positive trends associated with increases in wind speed and air temperature, and with decreases in precipitation and soil moisture. Finally, our findings suggest that the BCP should be considered as a significant source of dust for the regional inventory of particulate matter emissions from the Earth’s surface.

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Dissolved iron distributions in the central region of the Gulf of California, México

Cited by 16 publications

References 58 publications

Silicic acid biogeochemistry in the Gulf of California: Insights from sedimentary Si isotopes

Silicic acid biogeochemistry in the Gulf of California: Insights from sedimentary Si isotopes

Wintertime enrichment of inorganic nutrients in the Ballenas Channel, Gulf of California

The Baja California Peninsula, a Significant Source of Dust in Northwest Mexico

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