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La pérdida de masa de la capa de hielo de la Cordillera precedió a las inversiones climáticas cerca de la Terminación

B Menounos¹, B M Goehring², G Osborn³

¹Natural Resources and Environmental Studies Institute and Geography, University of Northern British Columbia, Prince George, British Columbia V2N 4Z9, Canada. menounos@unbc.ca.

Science (New York, N.Y.)

|November 11, 2017

Resumen

La capa de hielo de la Cordillera (CIS) se derritió mucho antes de lo que se pensaba, con una deglaciación significativa que ocurrió en 14.0 ka. Este derretimiento temprano impactó los niveles del mar y la descarga de agua de deshielo a los océanos.

Área de la Ciencia:

Paleoclimatología
Glaciología
Geología Cuaternaria

Sus antecedentes:

La capa de hielo de la Cordillera (CIS) fue una gran masa de hielo en el oeste de América del Norte.
Investigaciones anteriores sugirieron que el CIS persistió hasta 12.5 ka.

Objetivo del estudio:

Reevaluar el tiempo de deshielo del CIS.
Comprender las implicaciones de la deglaciación temprana en el clima y el nivel del mar.

Principales métodos:

Análisis de nuevos datos geológicos del extremo occidental de Canadá.
Comparación con modelos numéricos existentes del comportamiento de las capas de hielo.

Principales resultados:

Las áreas sustanciales del extremo occidental de Canadá estaban libres de hielo antes de 12.5 ka, algunas tan temprano como 14.0 ka.
El calentamiento temprano de Bølling-Allerød causó una rápida pérdida de masa de la CEI (se redujo a la mitad en 500 años), lo que contribuyó a un aumento del nivel del mar de 2,5 a 3,0 m.
Los avances glaciales ocurrieron durante los períodos Bølling-Allerød y Younger Dryas en áreas deglaciadas.

Conclusiones:

La deglaciación del CIS ocurrió antes de lo establecido anteriormente.
La descarga temprana de agua de deshielo influyó significativamente en la dinámica del océano Pacífico y del Ártico.
Los rápidos eventos de calentamiento climático desencadenaron respuestas sustanciales de las capas de hielo y los posteriores avances glaciales.

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