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Transporte a escala de cuenca de metales disueltos hidrotermales a través del Océano Pacífico Sur

Joseph A Resing¹, Peter N Sedwick², Christopher R German³

¹Joint Institute for the Study of the Atmosphere and the Ocean, University of Washington and NOAA-PMEL, 7600 Sand Point Way NE, Seattle, Washington 98115, USA.

|July 10, 2015

Resumen

Los respiraderos hidrotermales liberan hierro disuelto en el océano, desafiando las suposiciones anteriores sobre su transporte limitado. Este estudio muestra el transporte de largo alcance de hierro desde los respiraderos, impactando significativamente la biogeoquímica del océano y apoyando la producción primaria del Océano Austral.

Área de la Ciencia:

Química marina La química marina es la química de los océanos.
Oceanografía La oceanografía es la oceanografía.
Biogeoquímica La biogeoquímica es la bioquímica.

Sus antecedentes:

Las fuentes hidrotermales son reguladores clave de la química del océano, que influyen en las concentraciones de oligoelementos.
El hierro es un nutriente crítico para la producción primaria marina y el ciclo global del carbono.
Anteriormente, se pensaba que el hierro disuelto hidrotermal se perdía rápidamente de la solución cerca de fuentes de ventilación.

Objetivo del estudio:

Para investigar el transporte oceánico de largo alcance de hierro disuelto de fuentes hidrotermales.
Para reevaluar la importancia de la entrada de hierro hidrotermal para la biogeoquímica del océano.
Para cuantificar el flujo global de hierro disuelto hidrotermal.

Principales métodos:

Se utilizaron datos de los EE.UU. GEOTRACES Transacción Zonal del Pacífico Oriental (EPZT).
Analizó las concentraciones de hierro disuelto, manganeso y aluminio en el Océano Pacífico Sur.
Empleó un modelo biogeoquímico oceánico a escala global para simulaciones.

Principales resultados:

Demostró un transporte lateral significativo de hierro disuelto hidrotermal, manganeso y aluminio a través del Pacífico Sur.
Se observó un comportamiento casi conservador del hierro disuelto en plumas hidrotermales, lo que indica una longevidad prolongada.
Se estima un aporte global de hierro disuelto hidrotermal de 3-4 gigamoles por año, cuatro veces mayor que las estimaciones anteriores.

Conclusiones:

El hierro disuelto hidrotermal puede ser transportado a través de largas distancias oceánicas, contrariamente a creencias anteriores.
La estabilización físico-química es probablemente crucial para este transporte de largo alcance.
El hierro derivado hidrotermalmente juega un papel sustancial en el mantenimiento de la producción de exportación del Océano Austral.

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