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Registro de Volcanismo Desde el 7000 A.C. del núcleo de hielo de Groenlandia del GISP2 y las implicaciones para el
Science (New York, N.Y.)
|May 13, 1994
Resumen
Los núcleos de hielo de Groenlandia revelan una actividad volcánica significativa en el Holoceno temprano (5000-7000 aC). Este período vio un aumento de la deposición de sulfato, lo que podría causar el enfriamiento del clima.
Área de la Ciencia:
- Paleoclimatología Paleoclimatología
- Volcanología Volcanología.
- Glaciología glaciología.
Sus antecedentes:
- Los núcleos de hielo, como el núcleo GISP2 de Groenlandia, ofrecen valiosos archivos de las condiciones atmosféricas pasadas.
- Las concentraciones de sulfato en los núcleos de hielo sirven como proxies para la actividad volcánica y el forzamiento climático potencial.
- Comprender los eventos volcánicos pasados es crucial para reconstruir la historia del clima.
Objetivo del estudio:
- Para reconstruir un registro de volcanismo potencialmente forzador del clima utilizando concentraciones de sulfato del núcleo de hielo de Groenlandia GISP2.
- Para comparar la frecuencia y magnitud de los eventos volcánicos en el Holoceno temprano con los últimos dos milenios.
Principales métodos:
- Muestreo continuo bienal del núcleo de hielo de Groenlandia del GISP2.
- Análisis de las concentraciones de sulfato para identificar marcadores de erupción volcánica.
- La coincidencia de eventos de sulfato fechados con las erupciones volcánicas históricas documentadas.
Principales resultados:
- Se registró un número significativo de eventos de sulfato, particularmente entre 5000 y 7000 a.C.
- Mientras que el 85% de los eventos recientes (los últimos 2000 años) coincidieron con erupciones documentadas, solo el 30% de los eventos del Holoceno temprano lo hicieron.
- Los primeros eventos volcánicos del Holoceno mostraron deposiciones de sulfato 1-5 veces mayores que las erupciones históricas más grandes conocidas, con tres veces la frecuencia.
Conclusiones:
- El Holoceno temprano experimentó una actividad volcánica sustancialmente mayor de lo estimado previamente.
- Este aumento del vulcanismo puede haber jugado un papel importante en el enfriamiento del clima del Holoceno temprano.
- Algunas erupciones históricas podrían haber sido productores de azufre más impactantes de lo que se reconoce actualmente.
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