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La intensificación de las corrientes ascendentes como parte de la transición climática Plioceno-Pleistoceno
J R Marlow1, C B Lange, G Wefer
1Department of Fossil Fuels and Environmental Geochemistry, Drummond Building, University of Newcastle, Newcastle upon Tyne, NE1 7RU, UK. J.R.Marlow@ncl.ac.uk
Science (New York, N.Y.)
|December 23, 2000
Resumen
Las temperaturas de la superficie del mar en el sistema ascendente de Benguela se han enfriado significativamente en los últimos 4,5 millones de años. Este enfriamiento se correlaciona con un aumento de la ascendencia impulsada por el viento y los cambios en la circulación oceánica.
Área de la Ciencia:
- La paleoceanografía es la paleoceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
- Geología marina Geología marina.
Sus antecedentes:
- El sistema ascendente de Benguela es una región clave para estudiar la dinámica climática pasada.
- Comprender la variabilidad a largo plazo de la temperatura de la superficie del mar (SST) es crucial para el modelado climático.
Objetivo del estudio:
- Para reconstruir una serie de tiempo de 4,5 millones de años de SST en el sistema de surgencia de Benguela.
- Para investigar la relación entre el enfriamiento, el surgimiento y los cambios climáticos globales.
Principales métodos:
- Análisis de un núcleo de sedimentos de aguas profundas.
- Reconstrucción de la temperatura de la superficie del mar (SST) y la paleoproductividad.
Principales resultados:
- Una disminución de aproximadamente 10 grados C en la SST regional desde hace 3,2 millones de años.
- Evidencia de un aumento de la subida impulsada por el viento relacionado con el enfriamiento.
- Un cambio del calentamiento del Plioceno medio a los ciclos glaciales-interglaciales del Cuaternario tardío.
Conclusiones:
- La región de Benguela experimentó un enfriamiento significativo e intensificó el surgimiento.
- La circulación de la superficie oceánica en el Atlántico fue sustancialmente diferente durante el Plioceno medio en comparación con el Cuaternario tardío.
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