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Desaceleración de la circulación de volcado meridional del Atlántico a 25 grados N
Harry L Bryden1, Hannah R Longworth, Stuart A Cunningham
1National Oceanography Centre, Empress Dock, Southampton SO14 3ZH, UK. h.bryden@noc.soton.ac.uk
Nature
|December 2, 2005
Resumen
La circulación de volteo meridional del Atlántico se ha ralentizado en un 30% desde 1957. Esta desaceleración significativa tiene un impacto en el transporte de calor, con implicaciones para el cambio climático y los patrones climáticos europeos.
Área de la Ciencia:
- Oceanografía La oceanografía es la oceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
- Ciencias del Sistema Terrestre Ciencias del Sistema Terrestre
Sus antecedentes:
- La circulación de volteo meridional del Atlántico (AMOC) es crucial para la distribución global del calor.
- El transporte de calor de AMOC modera significativamente el clima europeo.
- Los cambios en el AMOC tienen profundas implicaciones para el cambio climático.
Objetivo del estudio:
- Para evaluar los cambios en la circulación de volcado meridional del Atlántico (AMOC).
- Para cuantificar los cambios en el transporte de calor del AMOC durante cinco décadas.
- Para analizar los impulsores de la desaceleración del AMOC.
Principales métodos:
- Análisis de una nueva sección oceanográfica transatlántica a 25 grados N.
- Comparación con cuatro secciones transatlánticas históricas que abarcan 1957-2004.
- Cuantificación del transporte de masa de agua a varias profundidades.
Principales resultados:
- La circulación de volcado meridional del Atlántico (AMOC) se ha ralentizado en aproximadamente un 30% entre 1957 y 2004.
- El transporte de calor hacia el norte por la Corriente del Golfo a 25 grados N se mantuvo relativamente constante.
- Se observó un aumento de la recirculación hacia el sur de las aguas de la termoclina y una disminución del transporte hacia el sur de las aguas profundas.
Conclusiones:
- La desaceleración observada de la AMOC se atribuye a cambios en los patrones de recirculación dentro del giro subtropical.
- El agua menos profunda está regresando hacia el sur, lo que indica un debilitamiento de la rama profunda de la circulación.
- Estos cambios tienen implicaciones significativas para las proyecciones climáticas futuras.
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