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El papel del Océano Austral en el intercambio de carbono durante la última deglaciación
Andrea Burke1, Laura F Robinson
1Massachusetts Institute of Technology/Woods Hole Oceanographic Institution Joint Program in Oceanography, Woods Hole, MA 02543, USA. aburke@whoi.edu
Science (New York, N.Y.)
|December 17, 2011
Resumen
La liberación de carbono en el Océano Antártico durante la deglaciación tuvo un impacto significativo en el CO2 atmosférico. Los registros de corales de aguas profundas revelan un importante evento de ventilación alrededor de 14.6 ka, lo que explica los desplazamientos de dióxido de carbono glacial e interglacial.
Área de la Ciencia:
- La paleoceanografía es la paleoceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
- La geoquímica marina es la geoquímica marina.
Sus antecedentes:
- Las fluctuaciones atmosféricas de CO2 durante los ciclos glacial-interglacial son un área clave de la investigación del clima.
- El papel del Océano Austral en la regulación del CO2 atmosférico a través de la subida de carbono y la desgasificación es una hipótesis principal.
Objetivo del estudio:
- Reconstruir un registro de radiocarbono a largo plazo del Océano Antártico para probar las hipótesis de los cambios de CO2 glacial e interglacial.
- Para investigar el momento y la naturaleza del intercambio de carbono entre las profundidades del océano y la atmósfera en el Océano Austral.
Principales métodos:
- Datación por radiocarbono de corales de aguas profundas del Océano Austral.
- Análisis del agotamiento del radiocarbono en las aguas profundas del océano durante los últimos 25.000 años.
Principales resultados:
- Un registro de radiocarbono de 25.000 años en el Océano Austral muestra aguas agotadas durante el período glacial y la deglaciación temprana.
- La estratificación profunda y el agotamiento del radiocarbono disminuyeron hace unos 14,6 mil años (ka).
- Este calendario se alinea con un importante evento de ventilación del Océano Austral, que transfiere carbono profundo a la superficie y la atmósfera.
Conclusiones:
- El Océano Antártico jugó un papel crítico en la modulación del CO2 atmosférico durante los cambios climáticos pasados.
- Un importante evento de ventilación en el Océano Austral alrededor de 14.6 ka está respaldado por datos de radiocarbono de corales de aguas profundas.
- Este evento explica la caída observada en el radiocarbono atmosférico durante la última deglaciación.
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