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La exportación de carbono de diatomo aumentó por el surgimiento de silicatos en el noreste del Atlántico
John T Allen1, Louise Brown, Richard Sanders
1National Oceanography Centre, Southampton SO14 3ZH, UK. jta@noc.soton.ac.uk
Nature
|September 30, 2005
Resumen
Las diatomeas prolongan la floración mediante la extracción de silicato de aguas profundas suministrado por frentes oceánicos inestables. Este mecanismo de fertilización de silicato mejora el secuestro de carbono en el Atlántico Norte, revelando un papel clave para las regiones frontales en la bomba biológica.
Área de la Ciencia:
- Biología marina Biología marina.
- Oceanografía La oceanografía es la oceanografía.
- Biogeoquímica La biogeoquímica es la bioquímica.
Sus antecedentes:
- Las diatomeas son un fitoplancton vital que utiliza el silicio (Si) para las paredes celulares.
- La dinámica de nutrientes en el Atlántico Norte limita la floración de las diatomeas, a pesar de la alta disponibilidad de nitratos.
- Las regiones frontales son cruciales para el secuestro de carbono a través de la bomba biológica.
Objetivo del estudio:
- Para investigar el mecanismo que prolonga las floraciones de diatomeas en las regiones frontales del Atlántico Norte limitadas por silicatos.
- Para entender cómo las diatomeas mejoran el secuestro de carbono a pesar del agotamiento de los nutrientes.
- Explorar las implicaciones más amplias del suministro de silicatos para la productividad del fitoplancton.
Principales métodos:
- Análisis de las concentraciones de nutrientes (silicato, nitrato) en las zonas frontales del Atlántico Norte.
- Observación de la dinámica de las flores de diatomeas en relación con las características oceanográficas.
- Modelado del suministro de silicatos y su impacto en la producción primaria.
Principales resultados:
- Las floraciones diatómicas son sostenidas por la "minería" de silicatos de aguas profundas.
- Frentes oceánicos inestables suministran periódicamente silicato, prolongando el crecimiento de las diatomeas.
- Esta fertilización de silicato mejora los eventos de exportación de carbono.
Conclusiones:
- Las regiones frontales juegan un papel importante en la bomba biológica a través de las flores de diatomeas mediadas por silicato.
- El mecanismo de "minería de silicatos" destaca el suministro de nutrientes como clave para el secuestro de carbono.
- Mecanismos similares pueden operar en otras regiones oceánicas limitadas en nutrientes.
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