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Los icebergs se descargan en el Atlántico Norte en escalas de tiempo milenarias durante la última glaciación
Science (New York, N.Y.)
|February 17, 1995
Resumen
Los ciclos frecuentes de parto de icebergs ocurrieron cada 2000-3000 años, vinculados a Groenlandia.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Oceanografía La oceanografía es la oceanografía.
- Glaciología glaciología.
Sus antecedentes:
- Los eventos de Heinrich representan descargas masivas de hielo de las capas de hielo que ocurren cada 7.000-10.000 años.
- Los eventos Dansgaard-Oeschger son rápidas oscilaciones climáticas registradas en los núcleos de hielo de Groenlandia.
Objetivo del estudio:
- Para investigar la frecuencia y la sincronicidad de los eventos de parto de icebergs en el Atlántico Norte.
- Para determinar la relación entre el parto de los icebergs, las oscilaciones de temperatura de Groenlandia y las temperaturas de la superficie del mar.
Principales métodos:
- Análisis de núcleos de alta resolución de aguas profundas del Atlántico Norte.
- Correlación de los datos de desprendimiento de icebergs con los registros de núcleos de hielo de Groenlandia (eventos Dansgaard-Oeschger).
- Comparación del momento del evento de parto con los datos de temperatura de la superficie del mar.
Principales resultados:
- Identificó frecuentes ciclos de parto de icebergs (intervalos de 2000 3000 años), distintos de los eventos de Heinrich.
- Demostró una correlación entre estos ciclos de parto y las oscilaciones de Dansgaard-Oeschger (calor-frío) en Groenlandia.
- Se observaron descargas sincrónicas de hielo de múltiples fuentes durante estos ciclos.
- Se descubrió que los ciclos de parto se desacoplaban de las fluctuaciones de temperatura de la superficie del mar.
Conclusiones:
- Un mecanismo dentro de la atmósfera probablemente impulsó rápidas oscilaciones de la temperatura del aire sobre Groenlandia.
- Este mecanismo atmosférico también influyó en el parto sincronizado de icebergs de múltiples capas de hielo.
- Los hallazgos revelan un modo más frecuente de variabilidad del clima y la capa de hielo de lo que se entendía anteriormente de los eventos de Heinrich.
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