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Variabilidad del clima antártico orbital y milenario durante los últimos 800.000 años
J Jouzel1, V Masson-Delmotte, O Cattani
1Laboratoire des Sciences du Climat et l'Environnement, Institut Pierre Simon Laplace, CEA-CNRS-Université de Versailles Saint-Quentin en Yvelines, CE Saclay, Gif-sur-Yvette, France. jean.jouzel@lsce.ipsl.fr
Science (New York, N.Y.)
|July 7, 2007
Resumen
Un nuevo perfil de deuterio de alta resolución del hielo antártico extiende los registros climáticos a 800.000 años atrás. Estos datos revelan eventos climáticos pasados y sugieren que los ciclos orbitales influyen en la intensidad del período interglacial.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Glaciología glaciología.
- Modelado del clima Modelado del clima
Sus antecedentes:
- Los núcleos de hielo proporcionan invaluables archivos paleoclimáticos.
- Los núcleos de hielo antárticos ofrecen reconstrucciones climáticas a largo plazo.
- El deuterio en el hielo es un sustituto de temperaturas pasadas.
Objetivo del estudio:
- Para presentar un perfil de deuterio de alta resolución de todo el Proyecto Europeo para el Corazón de Hielo en la Antártida.
- Para extender el registro climático antártico a la etapa de isótopos marinos 20.2 (aprox. hace 800.000 años).
- Para investigar la relación entre los eventos de Dansgaard-Oeschger y la variabilidad del clima antártico.
Principales métodos:
- Análisis de deuterio de alta resolución del núcleo de hielo Dome C.
- Experimentos de modelos de circulación general atmosférica que incorporan isótopos de agua.
- Análisis de la correspondencia de eventos climáticos entre los registros de Groenlandia y la Antártida.
Principales resultados:
- Ahora está disponible un perfil continuo de deuterio de alta resolución que cubre 800.000 años.
- Los experimentos modelo apoyan la interpretación del registro de deuterio como un proxy de temperatura.
- Se identificaron eventos similares a Dansgaard-Oeschger y sus contrapartes antárticas con amplitudes similares en períodos glaciales anteriores.
Conclusiones:
- El registro de la Cúpula C de la Antártida proporciona una visión detallada de la variabilidad climática pasada.
- El forzamiento orbital (oblicuidad y precesión) probablemente modula la intensidad de los períodos interglaciales.
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