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Una dinámica capa de hielo temprana de la Antártida Oriental sugerida por los paisajes de fiordos cubiertos de hielo
Duncan A Young1, Andrew P Wright, Jason L Roberts
1Institute for Geophysics, Jackson School of Geosciences, University of Texas at Austin, Austin, Texas 78758, USA. duncan@utig.ig.utexas.edu
Nature
|June 4, 2011
Resumen
La Antártida es la Antártida.
Área de la Ciencia:
- Geología Geología Geología.
- Glaciología glaciología.
- Paleoclimatología Paleoclimatología
Sus antecedentes:
- Las capas de hielo del Cenozoico se iniciaron en la Antártida debido al enfriamiento global.
- Las expansiones y retrocesos cíclicos de las capas de hielo ocurrieron hasta treinta veces, influyendo en los niveles del mar.
- Las oscilaciones de las capas de hielo dependen de las tierras bajas topográficas antárticas.
Objetivo del estudio:
- Para investigar la topografía basal de la cuenca subglacial Aurora en el este de la Antártida.
- Comprender la influencia de la topografía en las configuraciones pasadas de las capas de hielo.
- Para revelar la historia del paisaje moldeado por el flujo de hielo.
Principales métodos:
- Análisis de nuevos datos de radar de penetración de hielo.
- Interpretación de secuencias sedimentarias.
- Modelado numérico de la capa de hielo.
Principales resultados:
- Identificó un paisaje de fiordos con canales topográficos en la cuenca subglacial Aurora.
- Reveló una superficie compleja esculpida por configuraciones pasadas de la capa de hielo.
- Demostró que los bordes de las capas de hielo se sujetaron a lo largo de los márgenes de las cuencas durante las fluctuaciones.
Conclusiones:
- La topografía de la Cuenca Subglacial Aurora se caracteriza por canales tallados por el flujo de hielo pasado.
- Las configuraciones pasadas de las capas de hielo diferían significativamente de las actuales.
- El paisaje del fiordo fue moldeado por múltiples regímenes de flujo de hielo sobre depresiones profundas.
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