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Measuring Carbon-based Contaminant Mineralization Using Combined CO2 Flux and Radiocarbon Analyses
Published on: October 21, 2016
Los lagos y arroyos árticos como conductos de gas a la atmósfera: implicaciones para los presupuestos de carbono de
Science (New York, N.Y.)
|January 18, 1991
Resumen
Los ecosistemas acuáticos de la tundra ártica liberan dióxido de carbono (CO2) a la atmósfera, lo que desafía la suposición de un sumidero de carbono puramente terrestre. Este hallazgo sugiere que las estimaciones actuales de los sumideros de carbono pueden estar sobreestimadas.
Área de la Ciencia:
- Ciencias del medio ambiente Ciencias del medio ambiente.
- Ecología Ecología Ecología.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- La tundra ártica almacena una cantidad significativa de carbono y se considera un sumidero de dióxido de carbono atmosférico (CO2).
- Las estimaciones anteriores del balance de carbono se centraron únicamente en los ecosistemas terrestres, pasando potencialmente por alto las contribuciones acuáticas.
Objetivo del estudio:
- Para investigar el flujo de dióxido de carbono (CO2) en los ecosistemas acuáticos del Ártico y Alaska.
- Evaluar el papel de los sistemas acuáticos en el presupuesto global de carbono del Ártico.
Principales métodos:
- Mediciones de la presión parcial de dióxido de carbono (CO2) en 29 ecosistemas acuáticos diversos.
- Análisis de la liberación de CO2 de las aguas superficiales a la atmósfera.
Principales resultados:
- 27 de los 29 ecosistemas acuáticos mostraron una liberación neta de CO2 a la atmósfera.
- El CO2 liberado de los sistemas acuáticos probablemente se origina en entornos de tundra terrestre a través de la erosión y el transporte de aguas subterráneas.
- Este flujo acuático de CO2 sugiere que las estimaciones actuales del sumidero de carbono terrestre del Ártico pueden estar sobreestimadas hasta en un 20%.
Conclusiones:
- Los ecosistemas acuáticos del Ártico son fuentes significativas de CO2 atmosférico, no sumideros.
- Las estimaciones del sumidero de carbono terrestre para la tundra ártica requieren una revisión para incluir las contribuciones del sistema acuático.
- Comprender el ciclo completo de carbono del Ártico requiere tener en cuenta los flujos terrestres y acuáticos.
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