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Liberación abrupta de CO2 a la atmósfera en condiciones climáticas glaciales y interglaciales tempranas
C Nehrbass-Ahles1,2,3, J Shin4, J Schmitt5,2
1Climate and Environmental Physics, Physics Institute, University of Bern, Bern, Switzerland. cn425@cam.ac.uk.
Science (New York, N.Y.)
|August 22, 2020
Resumen
Los saltos de dióxido de carbono a la atmósfera ocurren tanto en climas fríos como cálidos, desafiando suposiciones anteriores. Estos eventos están relacionados con los cambios en la circulación oceánica y los cambios en los patrones de lluvia tropical.
Área de la Ciencia:
- Paleoclimatología
- Ciencias del clima
- Ciencias del Sistema Terrestre
Sus antecedentes:
- Anteriormente se pensaba que los pulsos de liberación de dióxido de carbono a escala centenaria ocurrían solo durante los períodos glaciales.
- Se creía que las condiciones climáticas más cálidas carecían de estos eventos abruptos de liberación de dióxido de carbono.
Objetivo del estudio:
- Para investigar la ocurrencia de saltos de dióxido de carbono (CDJ) en el clima pasado de la Tierra, específicamente entre hace 330.000 y 450.000 años.
- Determinar si el CDJ se produce en condiciones climáticas frías y cálidas.
Principales métodos:
- Análisis de un registro de alta resolución de dióxido de carbono que abarca entre 330.000 y 450.000 años antes del presente.
- Correlación de las fluctuaciones del dióxido de carbono con las condiciones climáticas y los patrones de circulación oceánica.
Principales resultados:
- Se identificaron saltos pronunciados de dióxido de carbono (CDJ) tanto en condiciones climáticas frías como cálidas.
- Se observaron dos tipos de CDJ, relacionados con la circulación meridional del Atlántico (AMOC) y los desplazamientos en la zona de convergencia intertropical.
- CDJ puede ocurrir durante los períodos interglaciales si el hielo terrestre influye significativamente en el AMOC a través de la entrada de agua dulce.
Conclusiones:
- Los saltos de dióxido de carbono son características generalizadas del ciclo del carbono, no limitadas a los períodos glaciales.
- El CDJ interglacial puede ocurrir cuando las masas de hielo terrestre extendidas interrumpen el AMOC.
- La dinámica de la circulación oceánica juega un papel crucial en la regulación del dióxido de carbono atmosférico en escalas de tiempo centenarias.
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