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El desencadenante volcánico de la desoxigenación del océano durante la retirada de la capa de hielo de la Cordillera

Jianghui Du^1,2, Alan C Mix³, Brian A Haley³

¹College of Earth, Ocean, and Atmospheric Sciences, Oregon State University, Corvallis, OR, USA. jianghui.du@erdw.ethz.ch.

|November 3, 2022

Resumen

La ceniza volcánica del retroceso de la capa de hielo desencadenó eventos de desoxigenación en el Pacífico Norte al fertilizar la productividad del océano. Este estudio revela un vínculo entre los sistemas de la Tierra y el cambio biogeoquímico del océano.

Área de la Ciencia:

Paleoceanografía
Ciencias del clima
Volcanología

Sus antecedentes:

Los eventos de desoxigenación del Pacífico Norte durante la última deglaciación fueron sostenidos por una alta productividad de las exportaciones.
Los desencadenantes precisos y los vínculos con el calentamiento deglacial siguen siendo inciertos.

Objetivo del estudio:

Investigar los mecanismos detrás de los eventos de desoxigenación del Pacífico Norte después del retroceso de la capa de hielo de la Cordillera (CIS).
Explorar el papel de la actividad volcánica y la fertilización del hierro en la conducción de los cambios biogeoquímicos del océano.

Principales métodos:

Análisis de los sedimentos del fondo marino para el contenido y el momento de la ceniza volcánica.
Correlación de las entradas volcánicas con el retroceso de la capa de hielo de la Cordillera y los eventos de desoxigenación.
Reconstrucción de eventos pasados de desoxigenación durante los últimos 50.000 años.

Principales resultados:

La desoxigenación inicial en el Pacífico Norte siguió a la retirada de la CEI y se correlacionó con el aumento de la ceniza volcánica.
La descarga de hielo probablemente inició el volcanismo explosivo regional, lo que condujo a la deposición de cenizas.
La fertilización del hierro inducida por la ceniza volcánica alimentó la productividad del océano, causando una desoxigenación sostenida.

Conclusiones:

El volcanismo explosivo regional, provocado por la descarga de hielo, jugó un papel clave en el inicio de la desoxigenación del Pacífico Norte.
El acoplamiento entre la atmósfera, el océano, la criosfera y los sistemas de la Tierra sólida puede generar cambios biogeoquímicos significativos en el océano en escalas de tiempo relativamente cortas.

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