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Variaciones del Younger Dryas en el radiocarbono atmosférico explicable sin cambios en la circulación oceánica

Goslar¹, Arnold, Tisnerat-Laborde

¹Institute of Physics, Silesian Technical University, Gliwice, Poland. goslar@zeus.polsl.gliwice.pl

|March 8, 2000

Resumen

Los niveles de radiocarbono atmosférico (14C) durante el Dryas más joven fueron más bajos de lo que se pensaba anteriormente. Nuevos datos de sedimentos de lagos sugieren que la actividad solar, no los cambios oceánicos, impulsó estas fluctuaciones de radiocarbono.

Área de la Ciencia:

Paleoclimatología Paleoclimatología
La datación por radiocarbono fue
Oceanografía La oceanografía es la oceanografía.

Sus antecedentes:

Las concentraciones atmosféricas de radiocarbono (14C) están influenciadas por la producción de rayos cósmicos y el intercambio de carbono con depósitos como el océano profundo.
Las fluctuaciones del 14C del Holoceno están relacionadas principalmente con las variaciones del campo magnético solar.
Estudios previos sugirieron altos niveles de 14C durante el Dryas más joven debido a la debilitada ventilación oceánica.

Objetivo del estudio:

Para reconstruir en alta resolución las concentraciones de radiocarbono atmosférico durante el Dryas más joven.
Reevaluar las causas de las fluctuaciones del 14C durante este período frío.

Principales métodos:

Análisis de los sedimentos lacustres anualmente laminados del lago Gosciaz y el lago Perespilno en Polonia.
Datamiento por radiocarbono de alta resolución de núcleos de sedimentos.

Principales resultados:

El máximo de 14C reconstruido en el Dryas más joven temprano fue menor de lo estimado previamente.
Las variaciones observadas en el 14C pueden atribuirse a cambios en la actividad solar.

Conclusiones:

El estudio desafía la interpretación de la reducción significativa de la ventilación oceánica profunda durante el Dryas más joven.
Los hallazgos sugieren que la actividad solar jugó un papel más significativo en las fluctuaciones del 14C de Younger Dryas de lo que se aceptaba anteriormente.

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