Multi-proxy dating of Iceland's major pre-settlement Katla eruption to 822-823 CE

Clive Oppenheimer
Investigations of the impacts of past volcanic eruptions on climate, environment, and society require accurate chronologies. However, eruptions that are not recorded in historical documents can seldom be dated exactly. Here we use annually resolved radiocarbon ($^{14}$C) measurements to isolate the 775 CE cosmogenic $^{14}$C peak in a subfossil birch tree that was buried by a glacial outburst flood in southern Iceland. We employ this absolute time marker to date a subglacial eruption of Katla...
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