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Las emisiones globales de dióxido de carbono de las aguas interiores

Peter A Raymond¹, Jens Hartmann, Ronny Lauerwald

¹Yale School of Forestry and Environmental Studies, 195 Prospect Street, New Haven, Connecticut 06511, USA.

|November 22, 2013

Resumen

La evasión global de dióxido de carbono (CO2) de las aguas interiores es más alta de lo estimado anteriormente. Este estudio revela variaciones regionales significativas e identifica puntos calientes para el flujo de CO2 de los ríos y arroyos.

Área de la Ciencia:

Ciencias ambientales Ciencias ambientales.
La geoquímica es la geoquímica.
Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima

Sus antecedentes:

La evasión de dióxido de carbono (CO2) de las aguas interiores es un componente crítico pero poco cuantificado del ciclo global del carbono.
Las estimaciones globales anteriores estaban limitadas por la falta de marcos estandarizados para el área de superficie, la velocidad de transferencia de gas y las bases de datos completas de CO2.

Objetivo del estudio:

Establecer un marco global para estimar la evasión de CO2 de las aguas interiores.
Para analizar las variaciones regionales en la superficie de las aguas interiores, el CO2 disuelto y la velocidad de transferencia de gases.
Para proporcionar tasas de evasión de CO2 globales actualizadas.

Principales métodos:

Desarrollo de un marco para estimar la superficie de las aguas interiores y la velocidad de transferencia de gases.
Compilación de una base de datos mundial de CO2 para las aguas interiores.
Análisis regional de las tasas de evasión de CO2 de arroyos, ríos, lagos y embalses.

Principales resultados:

Las tasas globales de evasión de CO2 se estiman en 1,8 Pg C / año de arroyos / ríos y 0,32 Pg C / año de lagos / embalses.
La tasa global total de evasión de CO2 fue de 2,1 Pg C/año, más alta que las estimaciones anteriores, impulsada por el aumento del flujo fluvial.
Identificación de puntos calientes globales en la evasión de CO2 de arroyos y ríos, con el 70% del flujo procedente del 20% de la superficie terrestre.

Conclusiones:

La evasión global de CO2 de las aguas interiores es un flujo de carbono sustancial y subestimado.
Existen importantes disparidades regionales en la evasión de CO2, con "puntos calientes" concentrados en los sistemas fluviales.
Se necesita más investigación para dilucidar las fuentes y los mecanismos que impulsan la evasión de CO2 de las aguas interiores a nivel mundial.

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