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Evidencia del oeste de América del Norte de cambios rápidos en el clima durante el último máximo glacial
Science (New York, N.Y.)
|June 25, 1993
Resumen
La cuenca de Estancia experimentó rápidos y fuertes pulsos de humedad durante la última edad de hielo, evidenciado por las plumas de agua dulce que entran en un lago salino. Estos ciclos, que duraron décadas, tuvieron un impacto significativo en el lago.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Geología Cuaternaria Geología Cuaternaria
- Hidrología Hidrología Hidrología.
Sus antecedentes:
- La cuenca Estancia en el suroeste de los Estados Unidos conserva registros de la variabilidad climática pasada.
- La evidencia sugiere fluctuaciones significativas en la disponibilidad de humedad durante el último período glacial.
Objetivo del estudio:
- Para investigar la naturaleza y el momento de los impulsos de suministro de humedad en la cuenca de Estancia durante la última edad de hielo.
- Para entender el impacto de estos legumbres en el sistema hidrológico regional, específicamente el lago salino.
Principales métodos:
- Análisis de registros sedimentarios, incluidas las columnas de arena de cuarzo, dentro de la cuenca de Estancia.
- La datación de las capas geológicas para establecer líneas de tiempo para eventos hidrológicos.
Principales resultados:
- Identificación de pulsaciones fuertes y rápidas en el suministro de humedad.
- Los eventos de descarga de corriente extendieron plumas de agua dulce cargadas de arena de cuarzo sobre el lago salino.
- Los principales pulsos de descarga duraron décadas, ocurriendo en ciclos de aproximadamente 200-250 y 2000 años.
Conclusiones:
- Estos pulsos de humedad fueron lo suficientemente poderosos como para refrescar y mantener el lago en su altura más alta registrada.
- Los hallazgos revelan la variabilidad climática cíclica a escala decadal que afectó a la hidrología del suroeste de los Estados Unidos durante la última edad de hielo.
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