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Cambios climáticos regionales causados por el enfriamiento global gradual en la época del Plioceno
Ana Christina Ravelo1, Dyke H Andreasen, Mitchell Lyle
1Ocean Sciences Department, University of California, Santa Cruz, California 95064, USA. acr@es.ucsc.edu
Nature
|May 21, 2004
Resumen
El clima de la Tierra se enfrió gradualmente durante más de cuatro millones de años, impulsado por cambios graduales, no por un solo evento. Las condiciones de baja latitud influyen significativamente en las retroalimentaciones climáticas globales.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- La dinámica del clima y su dinámica.
- Ciencia del sistema de la Tierra Ciencia del sistema de la Tierra
Sus antecedentes:
- El clima de la Tierra pasó de cálido a frío en los últimos 4 millones de años.
- Las influencias tectónicas en el transporte de calor del océano son las causas propuestas para esta transición.
- Los impulsores exactos del enfriamiento global y la glaciación siguen siendo objeto de debate.
Objetivo del estudio:
- Para investigar las causas de la transición climática a largo plazo de la Tierra.
- Para comparar registros climáticos en diferentes latitudes para comprender los patrones de enfriamiento.
- Para determinar la relación entre el clima de baja latitud y la sensibilidad climática de alta latitud.
Principales métodos:
- Análisis comparativo de registros climáticos de latitudes altas, subtropicales y tropicales.
- Examen de las diferencias regionales en el calendario del enfriamiento del clima.
- Evaluación de la sensibilidad del clima de latitudes altas a las variaciones del calentamiento solar.
Principales resultados:
- El inicio de los ciclos glaciales/interglaciales no se alineó con una sola reorganización climática de baja latitud.
- El enfriamiento global se produjo como un proceso gradual, no un evento repentino.
- La sensibilidad climática de altas latitudes aumentó gradualmente, particularmente después de hace 2 millones de años.
Conclusiones:
- Las diferencias climáticas regionales sugieren un proceso gradual de enfriamiento global.
- El establecimiento de condiciones frías de surgimiento tropical y subtropical precedió al aumento de la sensibilidad a las latitudes altas.
- Las condiciones climáticas medias de latitudes bajas juegan un papel importante en las retroalimentaciones climáticas globales.
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