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Un límite inferior para los niveles de dióxido de carbono atmosférico hace 3,2 mil millones de años
Angela M Hessler1, Donald R Lowe, Robert L Jones
1Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305-2115, USA. hesslera@gvsu.edu
Nature
|April 16, 2004
Resumen
Los modelos climáticos arqueanos pueden requerir gases de efecto invernadero más allá del dióxido de carbono. Una nueva investigación sobre suelos antiguos sugiere niveles más altos de dióxido de carbono de lo que se pensaba anteriormente, pero aún son potencialmente insuficientes para explicar el calor temprano de la Tierra.
Área de la Ciencia:
- * Estudios de la Tierra temprana.
- * La geoquímica.
- * La paleoclimatología.
Sus antecedentes:
- * Comprender la composición de la atmósfera del Arqueo es clave para la evolución temprana de la Tierra.
- * El dióxido de carbono y el metano son gases de efecto invernadero potenciales que influyen en el clima.
- * Estudios anteriores limitaron los niveles de dióxido de carbono por debajo de los requisitos del modelo para el calor.
Objetivo del estudio:
- * Para investigar la composición de la atmósfera en el período arqueo.
- * Determinar el papel del dióxido de carbono y otros gases de efecto invernadero en el mantenimiento de las temperaturas tempranas de la Tierra.
Principales métodos:
- * Análisis de las cáscaras de desgaste en grava de ríos de hace 3.200 millones de años.
- * Aplicación de reacciones de equilibrio modelo.
- * Análisis geoquímico de carbonatos ricos en hierro y minerales de arcilla.
Principales resultados:
- * Los carbonatos ricos en hierro indican una presión parcial mínima de dióxido de carbono varias veces mayor que los niveles actuales.
- * Estos niveles requeridos de dióxido de carbono todavía están por debajo de los requeridos en algunos modelos climáticos.
- * Los hallazgos desafían la dependencia exclusiva del dióxido de carbono para el calor del Arqueo.
Conclusiones:
- * Los niveles de dióxido de carbono atmosférico del Arqueo pueden haber sido más altos que algunas estimaciones.
- * El metano u otros gases de efecto invernadero probablemente jugaron un papel importante en el mantenimiento de la temperatura de la Tierra temprana.
- * Se necesitan más investigaciones para comprender completamente la regulación climática arcaica.
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