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Los clorofluorometanos antropogénicos en los mares de Groenlandia y Noruega
Science (New York, N.Y.)
|July 15, 1983
Resumen
Dos clorofluorometanos industriales, CCl(3)F (F-11) y CCl(2)F(2) (F-12), han llegado al océano profundo en los mares de Groenlandia y Noruega. Su distribución sugiere convección profunda mezclando escalas de tiempo de aproximadamente 40 años.
Área de la Ciencia:
- Oceanografía La oceanografía es la oceanografía.
- Química de la atmósfera química de la atmósfera
- Ciencias ambientales Ciencias ambientales.
Sus antecedentes:
- Los clorofluorometanos (CFM) son productos químicos industriales con presencia atmosférica y oceánica.
- Comprender la distribución de los CFM revela los procesos de mezcla de los océanos.
- Estudios anteriores observaron la presencia de CFM en aguas superficiales, pero la penetración en aguas profundas era menos conocida.
Objetivo del estudio:
- Para medir las concentraciones de CCl(3)F (F-11) y CCl(2)F(2) (F-12) en los mares de Groenlandia y Noruega.
- Investigar la distribución vertical y la penetración en aguas profundas de estos CFM.
- Para modelar las escalas de tiempo de mezcla de los océanos utilizando datos CFM.
Principales métodos:
- Muestreo de la columna de agua y la atmósfera marina en los mares de Groenlandia y Noruega.
- Análisis de las concentraciones de CCl(3)F (F-11) y CCl(2)F(2) (F-12).
- Aplicación de un modelo de caja dependiente del tiempo que incorpora mezcla convectiva profunda y intercambio lateral.
Principales resultados:
- Se encontraron concentraciones medibles de CFM en las cuencas profundas de ambos mares.
- Las distribuciones verticales de CFM se asemejaban a las de los radioisótopos producidos por bombas.
- El ajuste del modelo indicó una escala de tiempo de convección profunda de ~ 40 años en el mar de Groenlandia.
- Escala de tiempo de mezcla lateral entre las profundidades de Groenlandia y los mares noruegos estimado en 20-30 años.
Conclusiones:
- Los clorofluorometanos industriales han penetrado significativamente en las cuencas oceánicas profundas.
- Las distribuciones de CFM proporcionan información sobre las tasas de mezcla de océanos profundos.
- Las escalas de tiempo de mezcla oceánica en los mares de Groenlandia y Noruega están en el orden de las décadas.
- Las incertidumbres analíticas y del modelo afectan a las estimaciones precisas de mezcla de CFM.
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