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Relación estable del ciclo del carbono con el clima durante el Pleistoceno tardío
Urs Siegenthaler1, Thomas F Stocker, Eric Monnin
1Climate and Environmental Physics, Physics Institute, University of Bern, Sidlerstrasse 5, CH-3012 Bern, Switzerland.
Science (New York, N.Y.)
|November 29, 2005
Resumen
Los niveles de dióxido de carbono (CO2) atmosférico durante 650.000 años muestran una relación estable con el clima antártico. A pesar de un rango de CO2 más estrecho en ciclos glaciales anteriores, la sensibilidad al CO2 se mantuvo constante.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Ciencias de la atmósfera Ciencias atmosféricas.
- Investigación en la Antártida Investigación antártica.
Sus antecedentes:
- Comprender la dinámica climática a largo plazo es crucial para predecir el cambio climático futuro.
- Los registros anteriores de núcleos de hielo proporcionaron información sobre la composición atmosférica pasada y la variabilidad climática.
Objetivo del estudio:
- Para reconstruir las concentraciones de dióxido de carbono atmosférico (CO2) en los últimos 650.000 años.
- Investigar la relación entre los niveles de CO2 y el clima antártico durante múltiples ciclos glaciales.
Principales métodos:
- Análisis de las concentraciones de CO2 atmosférico utilizando el núcleo de hielo EPICA Dome Concordia.
- Extensión del registro de CO2 de Vostok a 650.000 años antes del presente.
- Comparación de los datos de CO2 con los registros de deuterio para evaluar la sensibilidad climática.
Principales resultados:
- El núcleo de hielo EPICA proporciona un registro de CO2 que se remonta a hace 650.000 años.
- Antes de 430.000 años BP, las concentraciones de CO2 oscilaron entre 180 y 260 ppmv, un rango más estrecho que en los recientes ciclos glaciales.
- La sensibilidad del clima antártico al CO2 se mantuvo estable a lo largo de seis ciclos glaciales.
Conclusiones:
- La relación a largo plazo entre el CO2 atmosférico y el clima antártico ha sido constante durante al menos 650.000 años.
- Los ciclos glaciales pasados exhibieron una sensibilidad estable al CO2 a pesar de las variaciones en los rangos de concentración de CO2.
- Este estudio mejora nuestra comprensión de la respuesta del sistema climático de la Tierra a las fluctuaciones de los gases de efecto invernadero en escalas de tiempo geológicas.
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