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Unraveling the Unseen Players in the Ocean - A Field Guide to Water Chemistry and Marine Microbiology
Published on: November 5, 2014
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Decodificadores de la atenuación del flujo de carbono en la bomba biológica oceánica
M Bressac1,2, E C Laurenceau-Cornec3,4, F Kennedy3
1Sorbonne Université, CNRS, Laboratoire d'Océanographie de Villefranche, Villefranche-sur-Mer, France. matthieu.bressac@imev-mer.fr.
Nature
|September 11, 2024
Resumen
La degradación microbiana representa entre el 7 y el 29% de la atenuación del flujo de carbono orgánico particulado oceánico (COP), lo que sugiere que el zooplancton juega un papel más importante. Las tasas de remineralización microbiana variaron significativamente en todas las regiones oceánicas y profundidades.
Área de la Ciencia:
- La oceanografía
- Biología marina
- Biogeoquímica
Sus antecedentes:
- La bomba biológica secuestra carbono en las profundidades del océano, alimentando los ecosistemas.
- La atenuación del flujo de carbono orgánico particulado (POC) en el mesopelagico es poco conocida.
- Los modelos actuales se basan en la "curva de Martin" empírica para la atenuación del flujo.
Objetivo del estudio:
- Investigar la atenuación del flujo de POC mediada por microbios en el mesopelagico.
- Para deconstruir los mecanismos detrás de la curva de Martin.
- Para comparar las funciones microbianas en diversos regímenes oceánicos.
Principales métodos:
- Experimentos in situ con el instrumento C-RESPIRE.
- Despliegue en múltiples profundidades mesopelágicas en seis regímenes oceánicos.
- Medición de la atenuación del flujo de POC mediada por microorganismos.
Principales resultados:
- La degradación microbiana contribuyó entre un 7 y un 29% a la atenuación del flujo de POC.
- La remineralización microbiana normalizada al flujo POC varió 20 veces en todos los sitios.
- Los gradientes de temperatura influyeron en las tendencias verticales en latitudes bajas, mientras que las propiedades de las partículas dominaron en otros lugares.
Conclusiones:
- Es probable que el zooplancton desempeñe un papel más importante en la atenuación del flujo de POC de lo que se suponía anteriormente.
- La remineralización microbiana es muy variable e influenciada por múltiples factores.
- Comprender estos mecanismos es crucial para refinar los modelos de secuestro de carbono oceánico.
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