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El consumo de oxígeno en los sedimentos marinos pelágicos
Science (New York, N.Y.)
|September 26, 1980
Resumen
El oxígeno disuelto disminuye con la profundidad de los sedimentos en el Pacífico, estabilizándose debido al limitado suministro de carbono orgánico de la bioturbación. Esto crea gradientes medibles de oxígeno y flujos difusos a través de la interfaz sedimento-agua.
Área de la Ciencia:
- Geología marina Geología marina.
- La geoquímica es la geoquímica.
- Oceanografía La oceanografía es la oceanografía.
Sus antecedentes:
- Se estudiaron los sedimentos en el Pacífico ecuatorial central, específicamente la arcilla roja pelágica y el sebo carbonatado.
- Comprender la dinámica del oxígeno en los sedimentos marinos es crucial para el ciclo biogeoquímico.
Objetivo del estudio:
- Para investigar la distribución vertical del oxígeno disuelto en los sedimentos pelágicos.
- Para determinar los factores que controlan el consumo de oxígeno en profundidad.
- Para cuantificar el flujo difusivo de oxígeno a través de la interfaz sedimento-agua.
Principales métodos:
- Mediciones in situ del oxígeno disuelto en aguas intersticiales de sedimentos marinos.
- Análisis de la composición de los sedimentos (argilla roja, ooze de carbonato).
- Evaluación del suministro de carbono orgánico a través de la bioturbación.
Principales resultados:
- El contenido de oxígeno disuelto disminuye con el aumento de la profundidad del sedimento.
- La concentración de oxígeno se estabiliza en valores distintos de cero en niveles más profundos.
- El suministro de carbono orgánico reactivo, influenciado por la bioturbación, limita el consumo de oxígeno.
- El flujo de oxígeno difusivo promedio calculado a través de la interfaz sedimento-agua es de 8,8 x 10(-14) mol/cm2/s.
Conclusiones:
- La bioturbación juega un papel clave en la regulación del consumo de oxígeno en los sedimentos marinos profundos.
- Los gradientes de oxígeno observados impulsan flujos de oxígeno difusivo medibles.
- La geoquímica y los procesos físicos de los sedimentos tienen un impacto significativo en la dinámica del oxígeno bentónico.
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