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Sincronicidad de las capas de hielo interhemisféricas durante el último máximo glacial.

Michael E Weber1, Peter U Clark, Werner Ricken

  • 1Institute of Geology and Mineralogy, University of Cologne, 50674 Cologne, Germany. michael.weber@uni-koeln.de

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La sincronización de los avances y retrocesos de las capas de hielo de la Antártida y el Hemisferio Norte fue sincrónica, desafiando las suposiciones anteriores sobre el forzamiento climático. Las teleconexiones probablemente sincronizaron estos eventos glaciales a gran escala a través de los hemisferios.

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Área de la Ciencia:

  • Paleoclimatología Paleoclimatología
  • Glaciología glaciología.
  • Ciencia Cuaternaria La ciencia cuaternaria es la ciencia cuaternaria.

Sus antecedentes:

  • La sincronización de la dinámica de las capas de hielo de la Antártida y el Hemisferio Norte durante los períodos glaciales pasados no se comprende bien.
  • Los modelos existentes sugieren que el forzamiento climático de superficie debería causar respuestas asincrónicas entre los hemisferios.

Objetivo del estudio:

  • Para establecer una cronología precisa para el sector del Mar de Weddell de la capa de hielo de la Antártida Oriental.
  • Para comparar la sincronización de la capa de hielo antártica con las capas de hielo del hemisferio norte.
  • Para investigar los mecanismos que sincronizan el comportamiento de la capa de hielo hemisférico.

Principales métodos:

  • Desarrollar una nueva cronología para el sector del mar de Weddell utilizando [métodos específicos no detallados en el resumen].
  • Integración de nuevos datos antárticos con cronologías existentes de otros sectores de la capa de hielo antártica y del hemisferio norte.
  • Analizando las posibles teleconexiones, incluido el forzamiento del nivel del mar y la formación de aguas profundas en el Atlántico Norte.

Principales resultados:

  • El avance y retroceso de la capa de hielo del mar de Weddell ocurrió sincrónicamente con la mayoría de las capas de hielo del hemisferio norte, dentro de las incertidumbres de datación.
  • El forzamiento climático de la superficie por sí solo no puede explicar la sincronización observada.
  • Los datos soportan las teleconexiones que conectan las capas de hielo del hemisferio norte, el nivel del mar y la circulación del océano Atlántico Norte con las líneas de conexión a tierra de la capa de hielo antártica.

Conclusiones:

  • Las capas de hielo hemisféricas probablemente avanzaron y retrocedieron al unísono.
  • Los cambios del nivel del mar y los cambios oceanográficos, impulsados por la dinámica de las capas de hielo del hemisferio norte, jugaron un papel crucial en la sincronización de las capas de hielo antárticas.
  • Este hallazgo tiene implicaciones para comprender la variabilidad climática pasada y predecir las respuestas futuras de las capas de hielo.