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Producción neta de oxígeno en el océano subtropical
Stephen C Riser1, Kenneth S Johnson
1School of Oceanography, University of Washington, Seattle, Washington 98195, USA. riser@ocean.washington.edu
Nature
|January 19, 2008
Resumen
El plancton oceánico en las regiones de bajos nutrientes son productores netos de oxígeno y carbono. Los aumentos continuos de oxígeno por debajo de los eventos de mezcla invernal revelan una autotropía neta consistente, desafiando las teorías de producción episódica.
Área de la Ciencia:
- Oceanografía La oceanografía es la oceanografía.
- Ecología marina Ecología marina.
- Biogeoquímica La biogeoquímica es la bioquímica.
Sus antecedentes:
- Las regiones oceánicas con bajos nutrientes comprenden el 80% de la superficie oceánica global.
- El papel de la comunidad de plancton en el oxígeno y el ciclo del carbono es incierto.
- Existen pruebas contradictorias entre los experimentos de botella (consumo neto) y los datos geoquímicos (producción neta).
Objetivo del estudio:
- Para investigar el balance neto de oxígeno y carbono en giros subtropicales.
- Para resolver la discrepancia entre las mediciones directas y la evidencia geoquímica.
- Evaluar el papel de la producción primaria episódica frente a la continua.
Principales métodos:
- Despliegue de sensores de oxígeno en flotadores de perfiles durante tres años.
- Monitoreo de las concentraciones de oxígeno en los giros subtropicales del Pacífico Norte y Sur.
- Análisis de la dinámica del oxígeno en relación con la mezcla de la columna de agua y la producción comunitaria.
Principales resultados:
- Los eventos de mezcla de invierno homogeneizan la columna de agua superior, lo que lleva a un bajo nivel de oxígeno.
- Se observa una tasa continua y casi constante de aumento de oxígeno por debajo de la capa mixta.
- Esta tasa se alinea con medidas independientes de la producción comunitaria neta.
Conclusiones:
- Los ecosistemas de giro subtropical son productores netos de carbono fijo (autotrófico neto) durante todo el año.
- La producción continua, no eventos episódicos, sostiene la producción positiva de oxígeno.
- Los hallazgos apoyan un estado autotrófico neto consistente en estas vastas regiones oceánicas.
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