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Modelado de las fluctuaciones climáticas de 100.000 años en series de tiempo pre-pleistoceno
Science (New York, N.Y.)
|February 7, 1992
Resumen
Los registros climáticos previos al Pleistoceno muestran fluctuaciones de 100.000 años antes de que cambie el volumen de hielo. El modelado sugiere que los cambios de temperatura impulsados por los monzones en latitudes bajas, impulsados por los ciclos orbitales de la Tierra, explican estos patrones climáticos antiguos.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Modelado del clima Modelado del clima
- Ciencias de la Tierra Ciencias de la Tierra Ciencias de la Tierra
Sus antecedentes:
- Los registros climáticos previos al Pleistoceno revelan fluctuaciones de temperatura significativas en el ciclo de excentricidad de 100.000 años (100-ky).
- Estas variaciones climáticas tempranas son anteriores a las fluctuaciones similares observadas en el volumen global de hielo.
Objetivo del estudio:
- Investigar el origen oscuro de las fluctuaciones climáticas del pre-Pleistoceno de 100 ky.
- Determinar si los sistemas de monzones de latitudes bajas pueden generar una variabilidad climática significativa en escalas de tiempo orbitales.
Principales métodos:
- Utilizó un estudio de modelado climático para simular campos de temperatura.
- Interacciones incorporadas entre el paso del sol a través del ecuador y el perihelio estacional.
Principales resultados:
- El modelado sugiere que las áreas terrestres de baja latitud, influenciadas por las fluctuaciones del monzón, pueden producir variaciones de temperatura de 100 ky y 400 ky.
- La respuesta de temperatura simulada es lo suficientemente sustancial como para ser preservada en el registro geológico.
- Las salidas del modelo se parecen mucho a las fluctuaciones del nivel del lago del Triásico observadas.
Conclusiones:
- El forzamiento orbital, amplificado por la dinámica de los monzones, puede explicar los ciclos climáticos pre-Pleistoceno de 100 ky.
- Este mecanismo proporciona una explicación plausible para la variabilidad climática temprana observada en los archivos paleoclimáticos.
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