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Área de la Ciencia:

  • Paleoclimatología Paleoclimatología
  • Modelado del clima en el modelo climático.
  • Ciencia del sistema de la Tierra Ciencia del sistema de la Tierra

Sus antecedentes:

  • La sensibilidad del clima al forzamiento radiativo puede variar con las condiciones climáticas de fondo.
  • Los datos paleoclimáticos han sido limitados para probar esta teoría.
  • La reconstrucción de los niveles pasados de dióxido de carbono atmosférico (CO2) es crucial para comprender la sensibilidad climática.

Objetivo del estudio:

  • Para probar si la sensibilidad climática de la Tierra al forzamiento radiativo depende del clima de fondo.
  • Para reconstruir los niveles de CO2 atmosférico durante la época del Plioceno tardío.
  • Para comparar la sensibilidad climática durante el Plioceno con el Pleistoceno tardío.

Principales métodos:

  • Se utilizaron registros de isótopos de boro de múltiples sitios para las reconstrucciones de CO2.
  • Datos climáticos analizados del Plioceno tardío (hace entre 3,3 y 2,3 millones de años).
  • Incorpora reconstrucciones del nivel del mar para tener en cuenta los cambios en el volumen de hielo.

Principales resultados:

  • La sensibilidad del sistema terrestre al CO2 fue la mitad de fuerte durante el Plioceno cálido en comparación con el frío Pleistoceno tardío.
  • La diferencia en la sensibilidad se atribuyó a la retroalimentación del albedo del hielo durante el Pleistoceno.
  • Se encontró que la sensibilidad climática de equilibrio era idéntica cuando se contabilizaba la retroalimentación del albedo del hielo.

Conclusiones:

  • No hubo retroalimentaciones climáticas inesperadas durante el Plioceno cálido.
  • Los modelos climáticos actuales predicen con precisión la sensibilidad climática de equilibrio para futuros similares al Plioceno.
  • Las predicciones climáticas futuras se alinean con el rango aceptado de 1.5 K a 4.5 K por duplicación de CO2, excluyendo las retroalimentaciones a largo plazo del albedo del hielo.