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La paleoceanografía. paleoceanografía. Inicio del flujo de salida del Mediterráneo hacia el Atlántico Norte
F Javier Hernández-Molina1, Dorrik A V Stow2, Carlos A Alvarez-Zarikian3
1Department of Earth Sciences, Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK. javier.hernandez-molina@rhul.ac.uk.
Science (New York, N.Y.)
|June 14, 2014
Resumen
La circulación de las aguas de salida del Mediterráneo (MOW, por sus siglas en inglés) tuvo un impacto significativo en los cambios climáticos del Atlántico Norte. El aumento de los volúmenes de MOW, vinculados a eventos tectónicos, influyó en la circulación termohalina y en la circulación de volcado meridional del Atlántico (AMOC).
Área de la Ciencia:
- Oceanografía La oceanografía es la oceanografía.
- La paleoceanografía es la paleoceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- El agua de salida del Mediterráneo (MOW) es una masa de agua significativa que influye en la circulación del Atlántico.
- Comprender su variabilidad histórica es crucial para reconstruir las dinámicas climáticas pasadas.
Objetivo del estudio:
- Para reconstruir los patrones de circulación de las aguas de salida del Mediterráneo (MOW) desde el Plioceno hasta la actualidad.
- Investigar la influencia de la MOW en la circulación termohalina global (THC) y la circulación invertida meridional del Atlántico (AMOC).
Principales métodos:
- Análisis de sedimentos excavados a lo largo del margen ibérico suroeste de la Expedición 339 del Programa Integrado de Perforación Oceánica.
- Identificación de hiatos de deposición indicativos de la erosión de la corriente de fondo.
Principales resultados:
- Limited MOW entró en el Atlántico después de que el Estrecho de Gibraltar se abriera hace 5.33 millones de años.
- El aumento de los volúmenes de MOW, a partir de finales del Plioceno, causó hiatos erosionales.
- Estos hiatos se correlacionan con eventos tectónicos regionales y cambios en la circulación termohalina global (THC).
Conclusiones:
- MOW jugó un papel clave en la influencia de AMOC, THC y los cambios climáticos.
- MOW contribuyó con agua tibia y salada a las latitudes del norte.
- La circulación de MOW fue, a su vez, influenciada por la tectónica de placas.
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