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Variabilidad temporal de la circulación de vuelco meridional del Atlántico a 26,5 grados N
Stuart A Cunningham1, Torsten Kanzow, Darren Rayner
1National Oceanography Centre, Empress Dock, Southampton SO14 3ZH, UK. scu@noc.soton.ac.uk
Science (New York, N.Y.)
|August 19, 2007
Resumen
La circulación de volcado meridional del Atlántico (MOC) muestra una variabilidad significativa año tras año, con un promedio de 18,7 Sv. Las mediciones continuas revelan sus cambios intraanuales, cruciales para comprender los impactos del cambio climático.
Área de la Ciencia:
- Oceanografía La oceanografía es la oceanografía.
- Ciencias del clima Ciencias del clima Ciencias del clima
- La oceanografía física es la oceanografía física.
Sus antecedentes:
- La circulación de volteo meridional del Atlántico (MOC, por sus siglas en inglés) es vital para la regulación climática global.
- La vulnerabilidad del MOC al calentamiento global es reconocida, pero su variabilidad a corto plazo sigue siendo poco comprendida.
- Las evaluaciones anteriores del cambio del MOC se basaron en datos escasos, lo que limita las inferencias sobre el cambio climático a escala decenal.
Objetivo del estudio:
- Para cuantificar la variabilidad intranual del MOC del Atlántico.
- Establecer una capacidad de monitoreo de alta resolución para los cambios interanuales del MOC.
Principales métodos:
- Utilizó mediciones continuas de MOC de la matriz Rapid Climate Change (RAPID) desde 2004.
- Datos integrados del transporte de la Corriente del Golfo y de las series temporales de transporte Ekman de la capa superficial.
- Instrumentos amarrados desplegados a lo largo de 26.5 grados N para la evaluación transatlántica del MOC.
Principales resultados:
- Se determinó que la fuerza anual promedio de MOC era de 18,7 ± 5,6 sverdrups (Sv).
- El flujo de MOC observado varió significativamente, desde 4.0 hasta 34.9 Sv.
- Demostrado que los cambios interanuales en el MOC pueden ser monitoreados con una precisión de 1,5 Sv.
Conclusiones:
- El monitoreo continuo de MOC proporciona una visión sin precedentes de su variabilidad a corto plazo.
- Comprender el rango dinámico de MOC es esencial para evaluar con precisión el impacto del cambio climático.
- La matriz RAPID permite un seguimiento robusto de las fluctuaciones de MOC cruciales para el modelado climático.
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