Tree-ring evidence of the widespread effects of explosive volcanic eruptions
- Univ. of East Anglia, Norwich (United Kingdom)
Tree-ring evidence from 97 sites over North America and Europe are used to develop a chronology of widespread cool summers since 1600. Averaging annual maximum-density information from the chronologies provides an index that correlates with Northern Hemisphere summer temperatures to 0.44 over 1851-1975. A number of the extreme low density years occur in both North America and Europe, suggesting a common response to high-frequency forcing. The analysis was repeated with ring-width information but the results are markedly less coherent. Of the five common extreme low density years (1601, 1641, 1669, 1699 and 1912) four are known to be coincident with the year or year following major volcanic eruptions. Other extreme low density indices in the continental series are also clear coincident with known volcanoes. The density indices clearly demonstrate great potential for quantifying the climate effectiveness and perhaps establishing precise calendar dates of large explosive volcanoes. 30 refs.
- DOE Contract Number:
- FG02-86ER60397
- OSTI ID:
- 150486
- Journal Information:
- Geophysical Research Letters, Vol. 22, Issue 11; Other Information: PBD: 1 Jun 1995
- Country of Publication:
- United States
- Language:
- English
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