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Circulación atmosférica mejorada sobre América del Norte durante el Holoceno temprano: evidencia del Lago Superior
Science (New York, N.Y.)
|April 6, 1984
Resumen
El tamaño del grano en los núcleos del Lago Superior aumentó con la profundidad, lo que indica una reducción de la corriente de fondo y las velocidades del viento entre hace 9500 y 6500 años. Esto sugiere cambios ambientales significativos en la región durante ese período.
Área de la Ciencia:
- La paleolimnología.
- La sedimentología sedimentológica.
- Geología Cuaternaria Geología Cuaternaria
Sus antecedentes:
- El registro de sedimentos del Lago Superior proporciona información sobre las condiciones ambientales pasadas.
- Comprender los cambios en la corriente de fondo y la velocidad del viento es crucial para reconstruir paleoclimas.
Objetivo del estudio:
- Para analizar perfiles de tamaño de grano en núcleos de sedimentos del Lago Superior.
- Para determinar los cambios en la corriente inferior y la velocidad del viento a lo largo del tiempo.
Principales métodos:
- Análisis de la distribución del tamaño de grano en cinco núcleos de sedimento.
- Correlación de las tendencias del tamaño del grano con la profundidad del enterramiento.
Principales resultados:
- El tamaño del grano aumentaba constantemente con la profundidad de enterramiento hacia el contacto postglacial-glacial.
- Estos cambios en el tamaño del grano indican una disminución significativa en la velocidad de la corriente inferior.
- Se dedujo una reducción correspondiente en la velocidad del viento para el período de hace 9500 a 6500 años.
Conclusiones:
- El registro de sedimentos del Lago Superior refleja cambios ambientales sustanciales entre hace 9500 y 6500 años.
- Las velocidades reducidas de corriente y viento sugieren cambios en la dinámica del lago y las influencias atmosféricas.
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