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Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
Published on: October 21, 2016
El dióxido de carbono atmosférico y los cambios en las reservas de carbono cambian
Science (New York, N.Y.)
|January 20, 1978
Resumen
La biosfera liberó una cantidad significativa de dióxido de carbono (CO2) entre 1850 y 1950, reduciendo la biomasa. Los océanos absorbieron el 47% del exceso de CO2, dejando el 53% en el aire.
Área de la Ciencia:
- Ciencias ambientales Ciencias ambientales.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
- Biogeoquímica La biogeoquímica es la bioquímica.
Sus antecedentes:
- Los niveles atmosféricos de dióxido de carbono (CO2) han aumentado significativamente desde la revolución industrial.
- Los cambios en el uso de la tierra impactan la biomasa terrestre y el ciclo del carbono.
- La absorción oceánica es un factor crítico en la regulación de las concentraciones de CO2 atmosférico.
Objetivo del estudio:
- Cuantificar la liberación neta de CO2 de la biosfera a la atmósfera entre 1850 y 1950.
- Evaluar el impacto de los cambios en el uso de la tierra en la biomasa terrestre.
- Para determinar la distribución del CO2 derivado de los combustibles fósiles entre la atmósfera y los sumideros oceánicos.
Principales métodos:
- Estimación de la liberación neta de CO2 de la biosfera basada en datos históricos.
- Cuantificación de los cambios en la biomasa terrestre debido a alteraciones en el uso de la tierra.
- Análisis de la absorción oceánica de CO2 en las regiones termoclinas y de aguas profundas.
Principales resultados:
- La liberación neta de CO2 de la biosfera promedió 1.2 x 10 ^ 9 toneladas de carbono por año desde 1850 hasta 1950.
- La biomasa terrestre disminuyó un 7% durante este período debido a los cambios en el uso de la tierra.
- El contenido de CO2 atmosférico aumentó en un 18% desde 1850, con un 53% restante en el aire.
Conclusiones:
- La biosfera fue una fuente neta de CO2 atmosférico durante el período industrial temprano.
- Los sumideros oceánicos, en particular los giros de la termoclina, juegan un papel crucial en la mitigación del aumento del CO2 atmosférico.
- Una fracción significativa del CO2 antropogénico permanece en la atmósfera, contribuyendo al cambio climático.
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