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Revisando la crisis de circulación oceánica de la transición del Pleistoceno medio
Sophia K V Hines1, Christopher D Charles2, Aidan Starr3,4
1Department of Marine Chemistry & Geochemistry, Woods Hole Oceanographic Institution, Woods Hole, MA, USA.
Science (New York, N.Y.)
|November 7, 2024
Resumen
La transición del Pleistoceno medio (MPT) no implicó una crisis de circulación oceánica profunda. Nuestro estudio muestra que la variabilidad de los océanos profundos glaciares se mantuvo constante, con solo pequeños ajustes para el almacenamiento de carbono durante este cambio climático.
Área de la Ciencia:
- Paleoceanografía
- Ciencias del clima
- Geoquímica
Sus antecedentes:
- La transición del Pleistoceno medio (hace aproximadamente 1,25 a 0,85 millones de años) marcó un cambio significativo en los ciclos climáticos glaciales e interglaciales.
- Una hipótesis líder propuso una crisis de circulación oceánica profunda alrededor de 0.90 Ma como la causa de la transición del Pleistoceno medio.
Objetivo del estudio:
- Investigar el papel de los cambios en la circulación oceánica profunda durante la transición del Pleistoceno medio.
- Para probar la hipótesis de una "crisis" de circulación a aproximadamente 0,90 Ma.
Principales métodos:
- Análisis de datos de isótopos de neodimio, carbono y oxígeno emparejados en alta resolución.
- Reconstrucción de la circulación oceánica profunda y el almacenamiento de carbono en el Océano Atlántico Sur (cuenca del Cabo).
Principales resultados:
- No se encontró evidencia de un cambio sustancial en la circulación oceánica profunda a lo largo de la transición del Pleistoceno medio.
- La variabilidad glacial del océano profundo antes y durante el MPT temprano reflejó la del ciclo glacial más reciente.
- El desarrollo de la estratificación de los océanos profundos solo requirió ajustes de circulación modestos para el almacenamiento de carbono.
Conclusiones:
- La transición del Pleistoceno medio no fue impulsada por un cambio fundamental o una crisis en la circulación oceánica profunda.
- La circulación oceánica mostró estabilidad, con pequeños ajustes para acomodar el aumento del almacenamiento de carbono a través de la estratificación.
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