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Cambios recientes en la ventilación de los océanos del sur
Darryn W Waugh1, Francois Primeau, Tim Devries
1Department of Earth and Planetary Sciences, Johns Hopkins University, Baltimore, MD 21218, USA. waugh@jhu.edu
Science (New York, N.Y.)
|February 2, 2013
Resumen
Los vientos occidentales del hemisferio sur se intensificaron debido al agujero de ozono en la Antártida, alterando la circulación oceánica. El análisis del clorofluorocarbono-12 (CFC-12) muestra cambios en la edad del agua del océano, lo que indica impactos significativos en la ventilación del océano sur.
Área de la Ciencia:
- Oceanografía La oceanografía es la oceanografía.
- Ciencias de la atmósfera Ciencias atmosféricas.
- Cambio climático El cambio climático.
Sus antecedentes:
- Los vientos occidentales de la superficie del hemisferio sur se han intensificado en las últimas décadas.
- Esta intensificación está relacionada con la formación del agujero de ozono antártico.
- El impacto en la circulación oceánica y la absorción de gas sigue siendo objeto de debate.
Objetivo del estudio:
- Para investigar el impacto de los vientos occidentales intensificados en la ventilación del océano sur.
- Para examinar los cambios en los patrones de circulación oceánica utilizando mediciones de trazador.
- Para entender el papel del agujero de ozono antártico en la alteración de la ventilación del océano.
Principales métodos:
- Mediciones utilizadas de clorofluorocarbono-12 (CFC-12) en los océanos del sur.
- Comparó los datos de CFC-12 de principios de la década de 1990 con los datos de mediados y finales de la década de 2000.
- Analizó los cambios en la edad de las masas de agua para inferir patrones de ventilación.
Principales resultados:
- Se observó una disminución en la edad de las aguas de modo subantártico subtropical.
- Se detectó un aumento en la edad de las aguas profundas circumpolares.
- Indicó cambios a gran escala y coherentes en la ventilación del océano sur.
Conclusiones:
- La formación del agujero de ozono antártico ha alterado de manera demostrable la ventilación del océano sur.
- Los vientos occidentales intensificados son un factor clave de estos cambios oceánicos observados.
- Los hallazgos proporcionan información crucial sobre las interacciones océano-atmósfera y las retroalimentaciones climáticas.
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