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El enfriamiento global durante la transición climática del eoceno-oligoceno
Zhonghui Liu1, Mark Pagani, David Zinniker
1Department of Geology and Geophysics, Yale University, New Haven, CT 06520, USA. zhliu@hku.hk
Science (New York, N.Y.)
|March 3, 2009
Resumen
La Tierra La Tierra La Tierra La Tierra La Tierra
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Ciencias del clima Ciencias del clima Ciencias del clima
- Geología Geología Geología.
Sus antecedentes:
- El clima de la Tierra pasó hace ~34 millones de años de un estado libre de hielo a la glaciación antártica.
- Comprender los cambios de temperatura en latitudes altas durante esta transición es crucial, pero está poco limitado.
- La evidencia de las primeras capas de hielo del hemisferio norte sigue siendo objeto de debate.
Objetivo del estudio:
- Para reconstruir los cambios en la temperatura de la superficie del mar (SST) en latitudes altas durante la transición climática Eoceno-Oligoceno.
- Para evaluar la magnitud y la heterogeneidad del enfriamiento polar.
- Evaluar la necesidad de la glaciación del hemisferio norte para el crecimiento observado del hielo.
Principales métodos:
- Análisis de registros proxy de la temperatura de la superficie del mar de varios sitios oceánicos.
- Integración de datos proxy con simulaciones de modelos de océanos y capas de hielo.
- Utilizando registros de isótopos de oxígeno bentónico para la reconstrucción del paleoclima.
Principales resultados:
- Las temperaturas de altas latitudes (45°70° N/S), previamente ~20°C, se enfriaron en un promedio de ~5°C.
- El enfriamiento fue sustancial y varió significativamente en las altas latitudes.
- Las simulaciones de modelos sugieren que la glaciación del hemisferio norte no fue esencial para el crecimiento del hielo antártico.
Conclusiones:
- Un enfriamiento significativo y heterogéneo ocurrió en latitudes altas durante la transición Eoceno-Oligoceno.
- El crecimiento de la capa de hielo antártica podría acomodarse sin la glaciación concurrente del hemisferio norte.
- Refine la comprensión de la dinámica climática del Cenozoico temprano y la evolución de las capas de hielo.
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