Characteristics and Possible Source of a 1479 A.D. Volcanic Ash Layer in a Greenland Ice Core

Characteristics and Possible Source of a 1479 A.D. Volcanic Ash Layer in a Greenland Ice Core

A microparticle concentration peak in a GISP2 ice core contains volcanic glass shards of rhyolitic composition that correspond in age to the 1479-1480 A.D. Mt. St. Helens Wn eruption. These glass shards are compositionally similar to the Wn tephra and constitute 83% of the total particle population....

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Veröffentlicht in:Quaternary research 1993-05, Vol.39 (3), p.267-273
Hauptverfasser: Fiacco, R. Joseph, Palais, Julie M., Germani, Mark S., Zielinski, Gregory A., Mayewski, Paul A.
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container_issue 3
container_start_page 267
container_title Quaternary research
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creator Fiacco, R. Joseph
Palais, Julie M.
Germani, Mark S.
Zielinski, Gregory A.
Mayewski, Paul A.
description A microparticle concentration peak in a GISP2 ice core contains volcanic glass shards of rhyolitic composition that correspond in age to the 1479-1480 A.D. Mt. St. Helens Wn eruption. These glass shards are compositionally similar to the Wn tephra and constitute 83% of the total particle population. The shards are very coarse-grained (up to 40 μm diameter), suggesting rapid transport from their source to Greenland. A major sulfate peak in the ice occurs approximately 4 months after deposition of the glass shards. This difference in depositional timing suggests primarily tropospheric transport of the ash and stratospheric transport of the sulfate aerosol. Large-scale climatic perturbations following this eruption were evidently negligible. Glaciochemical seasonal indicators suggest a late-fall to early-winter 1479 A.D. eruption.
doi_str_mv 10.1006/qres.1993.1033
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title Characteristics and Possible Source of a 1479 A.D. Volcanic Ash Layer in a Greenland Ice Core
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