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Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
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Las estimaciones consistentes de sumideros de carbono de EE.UU. basadas en la tierra y la atmósfera.

S W Pacala1, G C Hurtt, D Baker

  • 1Department of Ecology and Evolutionary Biology, Atmospheric and Oceanic Sciences Program, Princeton University, Princeton, NJ 08544, USA. Pacala@princeton.edu

Science (New York, N.Y.)
|June 26, 2001
PubMed
Resumen

Los Estados Unidos actuaron como un sumidero de carbono significativo desde 1980-89, absorbiendo 0,30 0,58 petagramos de carbono anualmente. Esta estimación, más grande que los estudios anteriores, incluye sectores no forestales y es consistente con las mediciones atmosféricas.

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Área de la Ciencia:

  • Ciencias ambientales Ciencias ambientales.
  • Química de la atmósfera La química de la atmósfera
  • Ecología Ecología Ecología.

Sus antecedentes:

  • La estimación precisa de los sumideros de carbono es crucial para comprender la dinámica global del ciclo del carbono.
  • Estudios previos sobre los sumideros de carbono de Estados Unidos tenían limitaciones en el alcance y la metodología.
  • El período 1980-1989 presenta un intervalo clave para evaluar las tendencias de secuestro de carbono.

Objetivo del estudio:

  • Para cuantificar el sumidero de carbono en los Estados Unidos para el período 1980-1989.
  • Para comparar las estimaciones terrestres con los métodos de inversión basados en la atmósfera.
  • Para investigar la estabilidad del sumidero de carbono de los Estados Unidos a lo largo del tiempo.

Principales métodos:

  • Estimación del flujo de carbono terrestre, incorporando procesos adicionales y flujos de componentes revisados.
  • Modelado atmosférico utilizando el método de inversión trazador-transporte basado en la concentración de dióxido de carbono.
  • Comparación y validación de las estimaciones de sumideros terrestres y atmosféricos.

Principales resultados:

  • Se estima que el carbono de EE.UU. se sumerge entre 0,30 y 0,58 petagramos de carbono por año (1980-89).
  • El flujo neto de carbono terrestre osciló entre 0,37 y 0,71 petagramos de carbono por año, lo que representa las exportaciones fluviales y comerciales.
  • Las estimaciones basadas en la tierra fueron significativamente más grandes que los estudios anteriores, con aproximadamente la mitad fuera del sector forestal.
  • Los resultados de inversión basados en la atmósfera fueron consistentes con las estimaciones basadas en la tierra, dentro de los rangos de incertidumbre.
  • El sumidero de carbono de Estados Unidos mostró una relativa estabilidad desde 1980-1989 hasta 1990-1994.

Conclusiones:

  • Los Estados Unidos contiguos funcionaron como un sumidero de carbono sustancial durante 1980-1989.
  • La inclusión de diversos procesos y sectores no forestales mejoró la precisión de la estimación del sumidero.
  • Los métodos terrestres y atmosféricos proporcionan estimaciones consistentes, aunque inciertas, del sumidero de carbono de los Estados Unidos.
  • El sumidero de carbono de los Estados Unidos se mantuvo relativamente estable a lo largo de los períodos evaluados.