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Los eventos de Heinrich desencadenados por el forzamiento oceánico y modulados por el ajuste isostático
Jeremy N Bassis1, Sierra V Petersen2, L Mac Cathles1,2
1Department of Climate and Space Science and Engineering, University of Michigan, Ann Arbor, Michigan, USA.
Nature
|February 17, 2017
Resumen
Los eventos Heinrich, descargas masivas de icebergs durante las edades de hielo, fueron provocados por el calentamiento del océano y la dinámica de las capas de hielo. Esta investigación explica su aparición durante períodos de clima frío, revelando la vulnerabilidad de las capas de hielo a las temperaturas del océano.
Área de la Ciencia:
- Paleoclimatología
- Glaciología
- La oceanografía
Sus antecedentes:
- La capa de hielo de Laurentide descargó grandes icebergs durante los eventos de Heinrich, dejando escombros en los sedimentos del océano.
- Estos eventos ocurrieron durante las fases frías de los ciclos de Dansgaard-Oeschger, contrariamente a las expectativas del comportamiento de la capa de hielo.
- El mecanismo que impulsa estos eventos masivos de descarga de icebergs sigue sin ser explicado.
Objetivo del estudio:
- Para explicar el momento y la magnitud de los eventos de Heinrich usando un modelo de capa de hielo.
- Para investigar el papel del calentamiento del océano y la dinámica de las capas de hielo en la descarga de icebergs.
- Comprender la naturaleza cíclica de los eventos de Heinrich en relación con las oscilaciones climáticas.
Principales métodos:
- Utilizó un modelo de capa de hielo para simular la dinámica glacial.
- Procesos incorporados que impulsan el retroceso de los glaciares modernos.
- Modelado los efectos del calentamiento subterráneo del océano y el ajuste isostático.
Principales resultados:
- El calentamiento subterráneo del océano aumenta el derretimiento submarino, causando un rápido retroceso de la capa de hielo y la descarga de icebergs.
- El ajuste isostático conduce a la elevación del lecho, aislando el extremo de la capa de hielo y permitiendo el avance.
- Este ciclo explica la ocurrencia de los eventos de Heinrich durante períodos de clima frío y en posiciones específicas de la capa de hielo.
Conclusiones:
- El estudio proporciona un mecanismo que explica el momento y la magnitud de los eventos de Heinrich.
- Las capas de hielo que terminan en el mar son vulnerables a un colapso catastrófico por el calentamiento del océano, incluso con un calentamiento atmosférico mínimo.
- Este mecanismo pone de relieve la compleja interacción entre la circulación oceánica, la dinámica de las capas de hielo y la variabilidad climática a escala milenaria.
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