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Un cambio de mar en nuestra visión de volcar en el Atlántico Norte subpolar
M S Lozier1, F Li1, S Bacon2
1Division of Earth and Ocean Sciences, Duke University, Durham, NC, USA. mslozier@duke.edu feili.li@duke.edu.
Science (New York, N.Y.)
|February 2, 2019
Resumen
El Programa de volcado en el Atlántico Norte subpolar (OSNAP) muestra que la circulación de volcado meridional del Atlántico (MOC) es muy variable. La conversión de aguas profundas en las cuencas de Irminger e Islandia, no solo en el mar de Labrador, impulsa esta variabilidad.
Área de la Ciencia:
- La oceanografía
- Ciencias del clima
- Océanografía física
Sus antecedentes:
- La circulación meridional del Atlántico (MOC) es crucial para la distribución global de calor y agua dulce.
- Los modelos del Grupo Intergubernamental de Expertos sobre el Cambio Climático (IPCC) proyectan una desaceleración del MOC en el siglo XXI.
- Se necesitan datos de observación para validar las proyecciones de MOC.
Objetivo del estudio:
- Establecer una base de observación para las proyecciones del MOC del IPCC.
- Analizar la variabilidad y el transporte de la MOC subpolar del Atlántico Norte.
Principales métodos:
- El despliegue del sistema de observación del volcado en el programa subpolar del Atlántico Norte (OSNAP) en el verano de 2014.
- Análisis de los primeros 21 meses de datos de observación.
Principales resultados:
- La circulación subpolar de vuelco exhibe una variabilidad significativa.
- Esta circulación transporta la mayor parte del calor y el agua dulce a través de la línea OSNAP.
- La conversión de aguas profundas en las cuencas de Irminger e Islandia es un factor primordial de la variabilidad de la MOC.
Conclusiones:
- El estudio desafía la opinión de que la formación de aguas profundas del mar de Labrador domina únicamente la variabilidad de la MOC.
- La conversión de las aguas atlánticas en las cuencas de Irminger e Islandia influye significativamente en el MOC subpolar.
- Estos hallazgos proporcionan datos observacionales críticos para refinar los modelos climáticos y las proyecciones de MOC.
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