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El modo de oscilación positiva persistente del Atlántico Norte dominó la Anomalía del Clima Medieval
Valérie Trouet1, Jan Esper, Nicholas E Graham
1Swiss Federal Institute for Forest, Snow, and Landscape Research (WSL), Zürcherstrasse 111, 8903 Birmensdorf, Switzerland. trouet@wsl.ch
Science (New York, N.Y.)
|April 4, 2009
Resumen
La Anomalía Climática Medieval (AMC) se caracterizó por una Oscilación del Atlántico Norte (OAN) positiva y persistente. Este cambio climático, vinculado a las condiciones de La Niña, contrasta con la posterior Pequeña Edad de Hielo (LIA).
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- La dinámica del clima La dinámica del clima La dinámica del clima
- Oceanografía La oceanografía es la oceanografía.
Sus antecedentes:
- La Anomalía Climática Medieval (AMC) fue un período cálido preindustrial significativo en Europa.
- Los impulsores precisos de la MCA y su transición a la Pequeña Edad de Hielo (LIA) siguen siendo incompletamente entendidos.
Objetivo del estudio:
- Para reconstruir la Oscilación del Atlántico Norte (NAO) durante un período de 947 años.
- Investigar la relación entre la dinámica de NAO y la transición climática MCA/LIA.
- Para explorar los cambios climáticos globales potencialmente vinculados a la circulación del Atlántico Norte.
Principales métodos:
- Desarrollo de una reconstrucción multidecadal de 947 años de NAO.
- Análisis de las salidas del modelo climático y datos proxy para reconstrucciones comparativas.
- Síntesis de datos proxy distribuidos globalmente para identificar patrones climáticos a gran escala.
Principales resultados:
- Se identificó una fase positiva persistente de la NAO durante el MCA.
- Se observó un cambio claro hacia condiciones de NAO más débiles que condujeron a la LIA.
- Los datos proxy globales indican una transición climática más amplia de MCA a LIA, potencialmente influenciada por condiciones similares a La Niña.
Conclusiones:
- El MCA se caracterizó por un NAO fuertemente positivo, lo que sugiere un patrón específico de circulación atmosférica.
- La transición a la LIA implicó un debilitamiento de la NAO, lo que indica una significativa variabilidad climática.
- La intensificación de la circulación de volteo meridional del Atlántico durante el MCA puede haber amplificado los cambios climáticos globales, incluidas las condiciones similares a La Niña.
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