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El enfriamiento glacial y la sensibilidad climática revisados
Jessica E Tierney1, Jiang Zhu2,3, Jonathan King4
1Department of Geosciences, University of Arizona, Tucson, AZ, USA. jesst@arizona.edu.
Nature
|August 28, 2020
Resumen
El último máximo glacial (LGM) vio un enfriamiento global de -6.1 ° C. Esta estimación de sensibilidad climática refina la comprensión de la respuesta de la Tierra a los gases de efecto invernadero y las capas de hielo.
Área de la Ciencia:
- Paleoclimatología
- Modelado del clima
- Geoquímica
Sus antecedentes:
- El Último Máximo Glacial (LGM) es un intervalo clave para comprender la dinámica del clima.
- Los estudios anteriores se enfrentaron a desafíos en la reconstrucción de un estado climático LGM completo debido a las limitaciones de los datos de representación.
Objetivo del estudio:
- Para crear una reconstrucción de campo completo de las temperaturas LGM.
- Para limitar el enfriamiento LGM medio global y la sensibilidad climática de equilibrio.
Principales métodos:
- Proxies geoquímicos combinados de la temperatura de la superficie del mar con un conjunto de modelos climáticos habilitados para isótopos.
- Se utilizaron técnicas de asimilación de datos para la reconstrucción de la temperatura.
- Validaron la reconstrucción con datos independientes y paleoclimáticos.
Principales resultados:
- Generado una reconstrucción de campo de las temperaturas LGM.
- La media global restringida de LGM se enfrió a -6,1°C (IC del 95%: -6,5 a -5,7°C).
- Sensibilidad climática de equilibrio estimada a 3,4 °C (2,4 °C a 4,5 °C), en consonancia con los rangos consensuados.
Conclusiones:
- El estudio proporciona una reconstrucción de la temperatura LGM robusta y asimilada por los datos.
- Los hallazgos refinan las estimaciones de sensibilidad climática, cruciales para las proyecciones climáticas futuras.
- Este trabajo pone de relieve el valor de la integración de diversos datos indirectos con los modelos climáticos.
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