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Aumento de la productividad en el océano subantártico durante los eventos Heinrich

Julian P Sachs¹, Robert F Anderson

¹Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Room E34-254, Cambridge, Massachusetts 02139, USA. jsachs@mit.edu

|April 29, 2005

Resumen

Las descargas masivas de icebergs desde el hemisferio norte, conocidas como eventos de Heinrich, se correlacionaron con un aumento de la productividad de las algas en el Océano Antártico. Esto sugiere cambios en la circulación oceánica global durante los cambios climáticos de la edad de hielo.

Área de la Ciencia:

Paleoclimatología Paleoclimatología
Oceanografía La oceanografía es la oceanografía.
Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima

Sus antecedentes:

Los eventos de Heinrich, enormes descargas de icebergs de las capas de hielo del hemisferio norte, marcan períodos fríos de la última edad de hielo.
Su impacto en el clima y la circulación del Atlántico Norte está bien documentado, pero la influencia más allá de esta región es incierta.

Objetivo del estudio:

Para investigar la influencia de los eventos de Heinrich en el hemisferio norte en el océano sur subpolar.
Comprender las teleconexiones entre las perturbaciones climáticas del Atlántico Norte y la productividad del Océano Austral.

Principales métodos:

Análisis de las huellas dactilares de la productividad molecular de las algas.
Uso de trazadores de radioisótopos para estudiar los patrones de sedimentación.
La datación de los registros paleoceanográficos durante los últimos 70.000 años.

Principales resultados:

Se identificaron ocho períodos distintos de aumento de la productividad del Océano Austral.
Estos eventos de productividad siguieron de cerca a los eventos de Heinrich en el hemisferio norte (dentro de 1,000-2,000 años).

Conclusiones:

Los eventos de Heinrich en el hemisferio norte probablemente desencadenaron cambios significativos en la productividad del Océano Austral.
Los mecanismos potenciales implican una circulación oceánica global alterada, el suministro de hierro y la estratificación estacional.
Comprender la respuesta del Océano Antártico es crucial para comprender el papel del océano en el cambio climático pasado y futuro.

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