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Ciclo del carbono. ciclo del carbono. La luz solar controla la columna de agua El procesamiento de carbono en aguas

Rose M Cory¹, Collin P Ward², Byron C Crump³

¹Earth and Environmental Sciences, University of Michigan, Ann Arbor, MI 48109, USA. rmcory@umich.edu.

Science (New York, N.Y.)

|August 23, 2014

Resumen

El deshielo del permafrost libera carbono orgánico disuelto (DOC). La oxidación fotoquímica, no la respiración bacteriana, domina el procesamiento de DOC en las aguas árticas, lo que afecta significativamente el presupuesto global de carbono.

Área de la Ciencia:

Ciencias ambientales Ciencias ambientales.
Biogeoquímica La biogeoquímica es la bioquímica.
Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima

Sus antecedentes:

El deshielo del permafrost libera cantidades significativas de carbono orgánico disuelto (COD) en los sistemas acuáticos.
El destino de este DOC, ya sea oxidado a CO2 o exportado a los océanos, es crucial para comprender el cambio climático.
El entendimiento actual atribuye principalmente el procesamiento de DOC a la respiración bacteriana.

Objetivo del estudio:

Investigar los principales mecanismos que controlan el destino del carbono orgánico disuelto (COD) en el deshielo de las aguas árticas afectadas por el permafrost.
Para cuantificar las contribuciones relativas de la oxidación fotoquímica y la respiración bacteriana al procesamiento DOC.

Principales métodos:

Muestreo de campo de lagos y ríos del Ártico.
Experimentos de incubación para medir las tasas de procesamiento de DOC.
Distinguir entre las vías de degradación fotoquímica y microbiana.

Principales resultados:

Se encontró que la oxidación fotoquímica era el proceso dominante para la eliminación de DOC en los lagos y ríos del Ártico.
La oxidación fotoquímica representó el 70-95% del total de DOC procesado en la columna de agua.
El procesamiento fotoquímico de DOC representa una porción sustancial (un tercio) de la liberación total de CO2 de las aguas superficiales del Ártico.

Conclusiones:

La oxidación fotoquímica juega un papel más importante que la respiración bacteriana en el procesamiento de DOC del deshielo del permafrost en entornos acuáticos árticos.
Este hallazgo destaca la importancia de la fotodegradación en el presupuesto de carbono del Ártico y sus implicaciones para el cambio climático global.
Se necesita más investigación para integrar completamente estos procesos fotoquímicos en los modelos climáticos.

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