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Aumento del crecimiento de la capa de hielo en Eurasia debido a los lagos adyacentes represados por hielo
G Krinner1, J Mangerud, M Jakobsson
1LGGE, CNRS-UJF Grenoble, BP 96, F-38402 Saint Martin d'Hères, France. krinner@ujf-grenoble.fr
Nature
|January 30, 2004
Resumen
Los grandes lagos proglaciales de Eurasia enfriaron significativamente los climas regionales de verano al reducir el derretimiento de la capa de hielo. Este enfriamiento aceleró el crecimiento de la capa de hielo y retrasó la desintegración, impactando en la dinámica climática pasada.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Glaciología glaciología.
- Ciencias de la atmósfera Ciencias atmosféricas.
Sus antecedentes:
- Los grandes lagos proglaciales influyen en el clima regional a través de la capacidad de calor y las retroalimentaciones atmosféricas.
- Los lagos eurasiáticos formados por represas de hielo se formaron hace ~90,000 años, bloqueando los ríos rusos durante el último período glacial.
Objetivo del estudio:
- Para investigar el impacto de los lagos proglaciales euroasiáticos en la capa de hielo de Barents-Kara.
- Para cuantificar el efecto de estos lagos en el derretimiento de las capas de hielo y el clima regional.
Principales métodos:
- Simulaciones de alta resolución utilizando un modelo de circulación general atmosférica.
- Simulación explícita del balance de masas de la superficie de la capa de hielo.
Principales resultados:
- Los lagos proglaciales euroasiáticos causaron un enfriamiento significativo del verano regional en Rusia.
- Este enfriamiento condujo a una reducción sustancial en el derretimiento de la capa de hielo en el margen sur.
- Los efectos de enfriamiento del verano superaron la disminución de las nevadas debido a la reducción de la humedad.
Conclusiones:
- El enfriamiento inducido por el lago proglacial aceleró el crecimiento de la capa de hielo de Eurasia y retrasó la desintegración.
- Este mecanismo probablemente también influyó en las capas de hielo de América del Norte.
- Los lagos proglaciales son factores clave en la dinámica glacial y las reconstrucciones paleoclimáticas.
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