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Distribuciones de las floraciones de fitoplancton en el océano sur
Science (New York, N.Y.)
|December 17, 1993
Resumen
Un nuevo algoritmo estima con precisión las concentraciones de pigmento de fitoplancton en el Océano Antártico, revelando niveles más altos y una distribución asimétrica vinculada a las corrientes oceánicas y la disponibilidad de nutrientes.
Área de la Ciencia:
- Oceanografía La oceanografía es la oceanografía.
- La detección remota con sensores.
- Biogeoquímica La biogeoquímica es la bioquímica.
Sus antecedentes:
- Las concentraciones de pigmento del fitoplancton son indicadores clave de la productividad del océano.
- Es posible que las estimaciones anteriores para el Océano Antártico hayan subestimado los niveles de pigmento.
- Comprender la distribución del pigmento es crucial para los estudios de los ecosistemas marinos.
Objetivo del estudio:
- Para validar un algoritmo de recuperación de pigmento regional utilizando los datos del escáner de color de la zona costera (CZCS) de Nimbus-7 para el Océano Austral.
- Para comparar nuevas estimaciones de concentración de pigmento con mediciones in situ y hallazgos anteriores.
- Para investigar los patrones de distribución espacial de los pigmentos del fitoplancton alrededor de la Antártida.
Principales métodos:
- Aplicación de un algoritmo de recuperación de pigmento regional a los datos satelitales CZCS.
- Comparación de las concentraciones de pigmento derivadas de algoritmos con las mediciones in situ.
- Análisis de los patrones de distribución de pigmentos en relación con las características oceanográficas.
Principales resultados:
- Las estimaciones de pigmento del algoritmo mostraron una excelente concordancia (dentro del 5%) con los datos in situ.
- Las concentraciones estimadas de pigmento fueron más del doble de las reportadas previamente para la región.
- Se observó una distribución asimétrica distinta de pigmentos mejorados alrededor de la Antártida, a diferencia de las propiedades geofísicas simétricas.
Conclusiones:
- El algoritmo validado proporciona una evaluación más precisa de la biomasa de fitoplancton del Océano Austral.
- La asimetría de pigmento observada está relacionada con las corrientes circumpolares y la disponibilidad de ácido silícico.
- Es probable que los oligoelementos de fuentes continentales, como el hierro, alimenten florecimientos intensos de fitoplancton en áreas específicas.
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