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Unraveling the Unseen Players in the Ocean - A Field Guide to Water Chemistry and Marine Microbiology

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La subducción impulsada por los remolinos exporta partículas de carbono orgánico de la floración de primavera

Melissa M Omand¹, Eric A D'Asaro², Craig M Lee²

¹Woods Hole Oceanographic Institution, Woods Hole, MA 02543, USA.

Science (New York, N.Y.)

|March 28, 2015

Resumen

Los remolinos oceánicos pueden transportar carbono orgánico particulado (COP) a las profundidades del mar, desafiando el modelo tradicional de hundimiento. Este flujo impulsado por los remolinos es un componente significativo, pero pasado por alto, del océano.

Área de la Ciencia:

Oceanografía La oceanografía es la oceanografía.
Biogeoquímica marina y biogeoquímica marina.
La oceanografía física es la oceanografía física.

Sus antecedentes:

La exportación de carbono orgánico en partículas (COP) a las profundidades del océano es crucial para la bomba de carbono biológica.
Tradicionalmente, la exportación de POC se atribuye únicamente al hundimiento pasivo de partículas.

Objetivo del estudio:

Para investigar el papel de las corrientes oceánicas dinámicas, específicamente remolinos, en el transporte vertical de POC.
Cuantificar la contribución del transporte de POC impulsado por remolinos al total de las exportaciones de carbono en el Atlántico Norte.

Principales métodos:

Utilizó observaciones de planeadores autónomos durante la floración primaveral del Atlántico Norte.
Se empleó modelado oceanográfico de alta resolución para simular la dinámica de los remolinos y el transporte de POC.
Analizó las propiedades del agua incluyendo POC, clorofila, oxígeno y temperatura-salinidad a varias profundidades.

Principales resultados:

Características anómalas observadas con características de agua superficial (POC elevado, clorofila, oxígeno) a 100-350 metros de profundidad.
Las aguas superficiales modeladas ricas en POC descienden en rasgos filamentosos coherentes a lo largo de los perímetros de los remolinos.
Identificó el flujo de POC impulsado por remolinos de submesoscala como una ruta de exportación significativa.

Conclusiones:

Los campos dinámicos de remolinos subducen activamente el agua superficial que contiene POC no hundido a profundidades intermedias.
El flujo de POC impulsado por los remolinos puede representar hasta la mitad de la exportación total de POC de primavera en los océanos subpolares productivos.
Los modelos actuales del ciclo global del carbono pueden subestimar la exportación de POC debido a los mecanismos de transporte impulsados por remolinos no resueltos.

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