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Correlación interhemisférica de los eventos glaciales del pleistoceno tardío
Science (New York, N.Y.)
|September 15, 1995
Resumen
Los avances de los glaciares en los Andes y Nueva Zelanda durante la última glaciación revelan cambios climáticos sincronizados. Estos cambios atmosféricos globales, no las corrientes oceánicas regionales, impulsaron las terminaciones de la edad de hielo.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Glaciología glaciología.
- Ciencias del clima Ciencias del clima Ciencias del clima Ciencias del clima
Sus antecedentes:
- La datación por radiocarbono revela máximos glaciales en los Andes chilenos y los Alpes del Sur, Nueva Zelanda.
- Estos eventos glaciales ocurrieron dentro de un ambiente frío y húmedo de Subantarctic Parkland.
- El final de la última glaciación vio el colapso masivo del lóbulo de hielo y los cambios en la vegetación.
Objetivo del estudio:
- Establecer una cronología de radiocarbono para los avances glaciales en los Andes chilenos y Nueva Zelanda.
- Para investigar el momento y la extensión de los máximos glaciales durante la última glaciación.
- Para explorar el acoplamiento climático interhemisférico y sus impulsores.
Principales métodos:
- Datamiento por radiocarbono (carbono-14) de los registros geológicos.
- Análisis de pulsos de rafting de hielo en el Atlántico Norte.
- Correlación de los eventos glaciales con los datos paleoceanográficos.
Principales resultados:
- Múltiples máximos glaciales identificados en los Andes chilenos entre ~14,000 y >33,500 años de carbono-14 antes del presente.
- También se registraron máximos glaciales en Nueva Zelanda, incluido uno al comienzo del Dryas más joven (~ 11,050 años de carbono-14 antes del presente).
- Estos eventos glaciales coincidieron con pulsos de rafting de hielo en el Atlántico Norte y un inicio simultáneo de la última terminación en ambos hemisferios.
Conclusiones:
- Los máximos glaciales en el hemisferio sur fueron contemporáneos con los eventos del Atlántico Norte, lo que sugiere un forzamiento climático global.
- La terminación sincronizada de la última glaciación implica una señal atmosférica global.
- El acoplamiento climático interhemisférico fue impulsado por procesos atmosféricos globales, no solo por la circulación termohalina del Atlántico Norte o la dinámica de las capas de hielo.
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