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Una historia de temperatura de 12 millones de años del Océano Pacífico tropical
Yi Ge Zhang1, Mark Pagani, Zhonghui Liu
1Department of Geology and Geophysics, Yale University, New Haven, CT 06511, USA.
Science (New York, N.Y.)
|April 5, 2014
Resumen
Las condiciones permanentes similares a El Niño antes de hace 3 millones de años no están respaldadas por los nuevos datos de temperatura de la superficie del mar (SST). Nuestros hallazgos revelan una piscina cálida más cálida del Pacífico hace 12 millones de años, desafiando reconstrucciones climáticas anteriores.
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:
- Estudios anteriores sugirieron que las condiciones permanentes parecidas a El Niño existían antes de hace 3 millones de años.
- Estas conclusiones se basaron en registros limitados de temperatura de la superficie del mar (SST) potencialmente afectados por problemas de diagenesis y calibración.
Objetivo del estudio:
- Para reconstruir registros SST más confiables del Océano Pacífico.
- Reevaluar la existencia de condiciones permanentes similares a El Niño en el Neogeno.
Principales métodos:
- Se establecieron nuevos registros de SST basados en biomarcadores.
- Se analizaron los cambios en las temperaturas de la piscina cálida del Pacífico y las temperaturas de la lengua fría.
- Gradientes de temperatura de zona ecuatorial cuantificados a lo largo del tiempo.
Principales resultados:
- La piscina cálida del Pacífico era aproximadamente 4 ° C más cálida hace 12 millones de años.
- Tanto la piscina caliente como la lengua fría se enfriaron gradualmente hacia las temperaturas modernas.
- Se mantuvo un gradiente de temperatura zonal estable de ~3°C a finales del Mioceno, aumentando en el Pliopleistoceno.
Conclusiones:
- Los hallazgos contradicen reconstrucciones anteriores que sugieren un estado permanente similar a El Niño.
- El clima del Pacífico Neógeno evolucionó gradualmente, no caracterizado por condiciones invariantes como El Niño.
- Los nuevos datos del SST proporcionan una comprensión más precisa de la dinámica climática del Pacífico en el pasado.
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