1. The influence of the ∼73 ka Toba super-eruption on the ecosystems of northern Sumatra as recorded in marine core BAR94-25
- Author
-
van der Kaars, Sander, Williams, Martin A.J., Bassinot, Franck, Guichard, François, Moreno, Eva, Dewilde, Fabien, and Cook, Ellyn J.
- Subjects
- *
VOLCANIC eruptions , *ANALYTICAL geochemistry , *VOLCANIC ash, tuff, etc. , *ISLANDS , *PINE - Abstract
Abstract: Examination of pollen content and geochemical analysis of marine core BAR94-25 taken from ∼100 km north-west of Sumatra in the Andaman Sea reveals a ∼100,000 year record of environmental change as well as the influence of the Toba super-eruption at ∼73,000 years ago on the ecosystems of northern Sumatra. The record also contains an older volcanic ash dated to ∼89,000 years ago, allowing a comparison of the effects of two eruptions on the local environments of the island. The immediate effects of the older eruption on the ecosystem of northern Sumatra were limited, though a gradual and substantial increase in pine forest likely followed the event in the longer term. The Toba super-eruption at ∼73,000 years ago, however, had an instantaneous and devastating effect on the pine forests of northern Sumatra. Evidence for impacts of this super-eruption at ∼73,000 years ago on regional climatic conditions remains inconclusive. Climatic changes inferred from the pollen record or estimated via pollen transfer functions date to a few thousand years after the eruption, or are clearly linked to long-term climatic trends initiated a few thousand years before. [Copyright &y& Elsevier]
- Published
- 2012
- Full Text
- View/download PDF