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CLIMA: El hielo, el barro apuntan al papel del CO2 en el ciclo glacial
Science (New York, N.Y.)
|September 11, 2007
Resumen
Las variaciones orbitales de la Tierra pueden impulsar las edades de hielo al influir en los niveles de dióxido de carbono atmosférico. Los cambios en el dióxido de carbono causan el calentamiento del efecto invernadero, lo que lleva a los ciclos glaciales.
Área de la Ciencia:
- La paleoceanografía es la paleoceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
- Ciencias del Sistema Terrestre Ciencias del Sistema Terrestre
Sus antecedentes:
- Los ciclos glaciales están vinculados a las variaciones orbitales de la Tierra.
- El mecanismo por el cual las variaciones orbitales influyen en el clima no ha sido claro.
- Las edades de hielo representan cambios significativos en el clima global.
Objetivo del estudio:
- Identificar el mecanismo que vincula las variaciones orbitales con los ciclos glaciales.
- Para investigar el papel del dióxido de carbono en la amplificación de los cambios climáticos.
- Para entender la transmisión del forzamiento orbital a través del sistema climático.
Principales métodos:
- Comparación de registros paleoclimáticos de sedimentos de aguas profundas.
- Análisis de los datos de núcleos de hielo de la Antártida.
- Correlación de las variaciones orbitales con los niveles de dióxido de carbono atmosférico.
Principales resultados:
- Las variaciones orbitales parecen modular las concentraciones de dióxido de carbono atmosférico.
- Los cambios en los niveles de dióxido de carbono se correlacionan con el aumento y disminución de los períodos glaciales.
- El dióxido de carbono actúa como un intermediario clave en la respuesta climática al forzamiento orbital.
Conclusiones:
- Las variaciones orbitales probablemente impulsan los ciclos glaciales mediante la regulación del dióxido de carbono atmosférico.
- Las fluctuaciones de dióxido de carbono amplifican el forzamiento orbital, causando cambios climáticos significativos.
- Este mecanismo explica cómo los cambios orbitales sutiles pueden desencadenar grandes ciclos de la edad de hielo.
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