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La sensibilidad del carbono tropical al cambio climático está limitada por la variabilidad del dióxido de carbono
Peter M Cox1, David Pearson, Ben B Booth
1College of Engineering, Mathematics and Physical Science, University of Exeter, Exeter EX4 4QF, UK. p.m.cox@exeter.ac.uk
Nature
|February 8, 2013
Resumen
Las selvas tropicales son bosques tropicales.
Área de la Ciencia:
- Ciencias del clima Ciencias del clima Ciencias del clima
- Ecología Ecología Ecología.
- Ciencia del sistema de la Tierra Ciencia del sistema de la Tierra
Sus antecedentes:
- La liberación de carbono de los bosques tropicales puede empeorar el cambio climático.
- Los modelos climáticos muestran incertidumbre en este efecto.
- Los modelos predicen un aumento del almacenamiento de carbono debido al CO2, pero una disminución del almacenamiento debido al calentamiento.
Objetivo del estudio:
- Reducir la incertidumbre en los modelos climáticos con respecto al almacenamiento de carbono de los bosques tropicales.
- Establecer una relación entre el almacenamiento de carbono en tierras tropicales y la tasa de crecimiento del CO2 atmosférico.
- Para limitar la sensibilidad del carbono terrestre tropical al cambio climático.
Principales métodos:
- Análisis de un conjunto de modelos acoplados del ciclo clima-carbono.
- Identificación de una relación lineal emergente entre las sensibilidades de los modelos.
- Integración con observaciones contemporáneas de CO2 atmosférico y temperaturas tropicales.
Principales resultados:
- Una relación lineal limita la sensibilidad del carbono terrestre tropical al calentamiento.
- Se estima que el calentamiento liberará 53 ± 17 gigatoneladas de carbono por kelvin de las tierras tropicales.
- Esto sugiere un menor riesgo de dieback de la Amazonía bajo el cambio climático inducido por CO2.
Conclusiones:
- El estudio proporciona una restricción más estricta sobre la sensibilidad de carbono de las tierras tropicales al cambio climático.
- Se indica un riesgo reducido de dieback en el Amazonas si los efectos de fertilización con CO2 son significativos.
- Una mayor certeza de la pérdida de carbono de las tierras tropicales está implícita si el calentamiento es impulsado por factores distintos al CO2.
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