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340.000 años de registro marino a escala centenaria de la oscilación climática del hemisferio sur
Katharina Pahnke1, Rainer Zahn, Henry Elderfield
1School of Earth, Ocean and Planetary Sciences, Cardiff University, Park Place, Cardiff CF10 3YE, UK. pahnkek@cf.ac.uk
Science (New York, N.Y.)
|August 16, 2003
Resumen
Los registros paleoceanográficos revelan que las latitudes medias meridionales siguen de cerca el clima antártico durante los períodos cálidos, pero muestran una variabilidad distinta durante los períodos glaciales, lo que sugiere patrones de circulación alterados.
Área de la Ciencia:
- La paleoceanografía es la paleoceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima
- Dinámica del clima en el hemisferio sur Dinámica del clima en el hemisferio sur
Sus antecedentes:
- Comprender los rápidos cambios climáticos en las latitudes medias del sur es crucial para los modelos climáticos globales.
- Las investigaciones anteriores a menudo se basan en proxies paleoclimáticos limitados, lo que requiere registros más detallados.
Objetivo del estudio:
- Desarrollar registros paleoceanográficos a escala centenaria del suroeste del Pacífico.
- Para permitir una comparación detallada con los registros de núcleos de hielo de la Antártida para el análisis del vínculo climático.
- Investigar el acoplamiento y desacoplamiento climático entre las latitudes altas y medias del sur.
Principales métodos:
- Desarrollo de registros paleoceanográficos a escala centenaria desde el suroeste del Pacífico.
- Análisis comparativo con los registros existentes de núcleos de hielo de la Antártida y Groenlandia.
Principales resultados:
- Los registros paleoceanográficos muestran un estrecho acoplamiento con el clima antártico durante los períodos deglaciales e interglaciales.
- Las secciones glaciales exhiben una mayor variabilidad en comparación con los núcleos de hielo de la Antártida, lo que indica un desacoplamiento climático.
- Las similitudes estructurales y temporales con los núcleos de hielo de Groenlandia sugieren una sincronicidad climática interhemisférica durante los períodos glaciales.
Conclusiones:
- Las latitudes medias meridionales están estrechamente acopladas al clima antártico durante las fases interglaciales y deglaciales.
- El aumento de la circulación circum-antártica durante los períodos glaciales conduce a la disociación climática entre las latitudes medias y altas del sur.
- La evidencia sugiere sincronicidad climática interhemisférica, lo que desafía los modelos de clima bipolar existentes.
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