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No. de sistema: 000059083

LDR _ _ 00000nab^^22^^^^^za^4500
008 _ _ 181105m20189999xx^^r^p^^^^^^z0^^^a0eng^d
040 _ _ a| ECO
c| ECO
043 _ _ a| n-mx-bs
044 _ _ a| xx
245 0 0 a| Evidence of intense suboxia and anoxia in a tropical bay of the Gulf of California
506 _ _ a| Disponible para usuarios de ECOSUR con su clave de acceso
520 1 _ a| The expansion of the upper boundary of the oxygen minimum zone (OMZ) has been associated with the low solubility of oxygen in the surface ocean due to global warming in tropical regions. However, sedimentary records of δ15N of sinking particulate organic matter and sediments suggest that oxygen solubility is controlled by oceanographic forcing in the tropical equatorial region. To determine the intensification of the OMZ within its upper border, δ15N analysis of the organic matter in superficial sediments of La Paz Bay was carried out. In the present work, 115 samples of superficial sediment were collected in the interval of 2–407 m depth in La Paz Bay. The surface sediments were analysed for the nitrogen isotopic composition of their organic matter. Hypoxia conditions (< 60 μM) at 100 m to depth suggest an intense denitrification of the water column that it was reflected in the sedimentary δ15N. The δ15N of the organic matter is 1.5‰ greater in the bay than in the mouth of the Gulf of California, indicating greater denitrification towards the interior of the bay with respect to the gulf mouth. The intense suboxia/anoxia conditions have been maintained due to a well-mixed water column that promotes exported productivity in La Paz Bay.
533 _ _ a| Reproducción electrónica en formato PDF
538 _ _ a| Adobe Acrobat profesional 6.0 o superior
650 _ 4 a| Materia orgánica
650 _ 4 a| Isótopos del nitrógeno
650 _ 4 a| Desnitrificación
650 _ 4 a| Zona mínima de oxígeno
651 _ 4 a| Bahía de La Paz (Baja California Sur, México)
700 1 _ a| Sánchez, Alberto
e| autor
700 1 _ a| Rodríguez Figueroa, Griselda Margarita
e| autora
700 1 _ a| Shumilin, Evgueni N.
e| coaut.
700 1 _ a| Ortíz Hernández, Ma. Concepción
e| autora
773 0 _
t| Continental Shelf Research
g| Vol. 168 (September 2018), p. 21-27
x| 0278-4343
900 _ _ a| Solicítelo con su bibliotecario/a
901 _ _ a| Artículo con arbitraje
902 _ _ a| BG / MM
904 _ _ a| Noviembre 2018
905 _ _ a| Artecosur
905 _ _ a| Biblioelectrónica
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*Solicítelo con su bibliotecario/a
Evidence of intense suboxia and anoxia in a tropical bay of the Gulf of California
Sánchez, Alberto (autor)
Rodríguez Figueroa, Griselda Margarita (autora)
Shumilin, Evgueni N. (autor)
Ortíz Hernández, Ma. Concepción (autora)
Nota: Disponible para usuarios de ECOSUR con su clave de acceso
Contenido en: Continental Shelf Research. Vol. 168 (September 2018), p. 21-27. ISSN: 0278-4343
No. de sistema: 59083
Tipo: - Artículo con arbitraje
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"The expansion of the upper boundary of the oxygen minimum zone (OMZ) has been associated with the low solubility of oxygen in the surface ocean due to global warming in tropical regions. However, sedimentary records of δ15N of sinking particulate organic matter and sediments suggest that oxygen solubility is controlled by oceanographic forcing in the tropical equatorial region. To determine the intensification of the OMZ within its upper border, δ15N analysis of the organic matter in superficial sediments of La Paz Bay was carried out. In the present work, 115 samples of superficial sediment were collected in the interval of 2–407 m depth in La Paz Bay. The surface sediments were analysed for the nitrogen isotopic composition of their organic matter. Hypoxia conditions (< 60 μM) at 100 m to depth suggest an intense denitrification of the water column that it was reflected in the sedimentary δ15N. The δ15N of the organic matter is 1.5‰ greater in the bay than in the mouth of the Gulf of California, indicating greater denitrification towards the interior of the bay with respect to the gulf mouth. The intense suboxia/anoxia conditions have been maintained due to a well-mixed water column that promotes exported productivity in La Paz Bay."


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