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Simulación transitoria de la última deglaciación con un nuevo mecanismo para el calentamiento de Bolling-Allerod
Z Liu1, B L Otto-Bliesner, F He
1Key Laboratory of Meteorological Disaster, Nanjing University of Information Science and Technology, Nanjing, 210044, China. zliu3@wisc.edu
Science (New York, N.Y.)
|July 18, 2009
Resumen
El calentamiento de Bølling-Allerød fue simulado por un modelo climático acoplado. Este abrupto calentamiento fue desencadenado por la circulación meridional del Atlántico que se volcó.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Modelado del clima en el modelo climático.
- Interacciones entre el océano y la atmósfera.
Sus antecedentes:
- El último máximo glacial a la transición Bølling-Allerød (BA) representa un período crítico de cambio climático rápido.
- Comprender los mecanismos que impulsan los cambios climáticos abruptos como el calentamiento BA es crucial para predecir la dinámica climática futura.
Objetivo del estudio:
- Investigar la evolución del clima deglacial desde el Último Máximo Glacial hasta el calentamiento BA utilizando un modelo de circulación general sincrónicamente acoplado atmósfera-océano.
- Para aclarar el papel de la circulación de volcado meridional del Atlántico (AMOC) en el evento abrupto de calentamiento de BA.
Principales métodos:
- Realizó la primera simulación del modelo de circulación general atmósfera-océano sincrónicamente acoplada que cubre el período desde el Último Máximo Glacial hasta el calentamiento BA.
- Analizó la simulación del modelo de las principales características climáticas deglaciales y la dinámica del AMOC.
Principales resultados:
- El modelo reprodujo con éxito las principales características de la evolución del clima deglacial, lo que indica un buen acuerdo con la sensibilidad climática observacional.
- El abrupto calentamiento de BA se simuló como una respuesta transitoria del AMOC al cese de la descarga de agua dulce en el Atlántico Norte.
- Propuso un nuevo mecanismo para la transición de BA que implica la superposición de respuestas al forzamiento de CO2, la recuperación de AMOC del evento Heinrich 1 y el exceso de AMOC.
Conclusiones:
- El estudio proporciona una nueva perspectiva sobre los impulsores del abrupto calentamiento de Bølling-Allerød, enfatizando el papel de la dinámica de AMOC.
- Los hallazgos sugieren que la interacción del forzamiento externo y la variabilidad interna océano-atmósfera puede conducir a rápidos cambios climáticos.
- El éxito del modelo en la simulación de eventos paleoclimáticos clave valida su utilidad para estudiar el cambio climático pasado y futuro.
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