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La piscina cálida tropical se expandió en gran medida y debilitó la circulación de Hadley a principios del Plioceno
Chris M Brierley1, Alexey V Fedorov, Zhonghui Liu
1Department of Geology and Geophysics, Yale University, New Haven, CT 06520, USA.
Science (New York, N.Y.)
|March 3, 2009
Resumen
El intervalo cálido del Plioceno fue probablemente causado por una expansión hacia los polos de la piscina cálida del océano, reduciendo los gradientes de temperatura. Esto sugiere que los mecanismos mejorados de absorción de calor del océano estuvieron activos durante este período.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Oceanografía La oceanografía es la oceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- El intervalo cálido del Plioceno presenta un desafío para el modelado climático.
- Comprender los períodos cálidos pasados es crucial para predecir el cambio climático futuro.
Objetivo del estudio:
- Para reconstruir las temperaturas de la superficie del mar durante el Plioceno temprano (hace unos 4 millones de años).
- Para explicar los impulsores del intervalo cálido del Plioceno.
Principales métodos:
- Reconstrucción de la distribución latitudinal de la temperatura de la superficie del mar.
- Análisis de los gradientes de temperatura en el Océano Pacífico.
Principales resultados:
- Se observó un gradiente de temperatura meridional significativamente reducido.
- La evidencia apunta a una expansión hacia los polos de la piscina cálida tropical del océano.
- El contraste de temperatura del Pacífico disminuyó de ~ 8 ° C hoy a ~ 2 ° C en el Plioceno temprano.
Conclusiones:
- La piscina cálida expandida impactó el clima del Plioceno, ralentizando la circulación de Hadley y promoviendo condiciones similares a El Niño.
- El mantenimiento de débiles gradientes de temperatura de la superficie del mar tropical puede requerir una mayor absorción de calor del océano, como una mayor mezcla vertical.
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