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La ventilación de las profundidades del Océano Antártico y el aumento de CO2 deglacial
L C Skinner1, S Fallon, C Waelbroeck
1Godwin Laboratory for Palaeoclimate Research, Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK. lcs32@esc.cam.ac.uk
Science (New York, N.Y.)
|May 29, 2010
Resumen
Durante las edades de hielo, la liberación de dióxido de carbono (CO2) en las profundidades del océano alimentó el aumento del CO2 atmosférico. Los datos de radiocarbono del Océano Antártico lo confirman, mostrando aguas profundas más antiguas durante los períodos glaciales. Esto apoya el Océano Austral.
Área de la Ciencia:
- La paleoceanografía es la paleoceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima
- Oceanografía La oceanografía es la oceanografía.
Sus antecedentes:
- Los niveles de dióxido de carbono (CO2) en la atmósfera fluctuaron significativamente durante los ciclos glaciales-interglaciales pasados.
- Se supone que estos cambios de CO2 son impulsados por la liberación de carbono de aguas profundas, particularmente del Océano Antártico.
Objetivo del estudio:
- Investigar el papel del Océano Austral en la regulación del CO2 atmosférico durante los cambios climáticos pasados.
- Para probar la hipótesis de que la liberación de CO2 en aguas profundas a través del Océano Antártico influyó en las concentraciones de CO2 atmosférico glacial e interglacial.
Principales métodos:
- Análisis de los niveles de radiocarbono (14C) en el sector Atlántico del Océano Austral.
- Comparación de las edades de radiocarbono de aguas profundas entre los períodos glaciales e interglaciales.
- Modelado de la influencia de la circulación de aguas profundas en el CO2 atmosférico2.
Principales resultados:
- Se descubrió que las aguas profundas en la región antártica eran más del doble de antiguas durante el último período glacial en comparación con los niveles actuales, en relación con la atmósfera.
- Esta "vieja" agua profunda probablemente estaba enriquecida en dióxido de carbono.
- La liberación de esta agua enriquecida con CO2 durante la deglaciación contribuyó al aumento gradual del CO2 atmosférico.
Conclusiones:
- Los hallazgos apoyan fuertemente la hipótesis de que el Océano Austral jugó un papel crítico en la rápida liberación de CO2 secuestrado durante deglaciaciones pasadas.
- La edad y el contenido de CO2 de las aguas profundas del Océano Antártico, moduladas por la circulación de volcadura de la Antártida, son factores clave en la dinámica del CO2 atmosférico glacial e interglacial.
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