Abstract
Illuminating the volcanic signal in tree rings
Highlights
Volcanic eruptions that loft aerosols into the stratosphere offer natural experiments by which to explore the response of the climate system to short-term changes in radiative forcing
Both Krakatoa and Novarupta resulted in strong reductions in atmospheric transmissivity, leading to a reduction in surface solar radiation intensity which was recorded by contemporary pyrheliometer measurements (Kimball 1918)
The cold bias is larger in magnitude in high-latitude regions where photosynthesis is inferred to be more limited by light (Nemani et al 2003), supporting the hypothesis that trees respond directly to decreases in light availability
Summary
Volcanic eruptions that loft aerosols into the stratosphere offer natural experiments by which to explore the response of the climate system to short-term changes in radiative forcing. Post-eruption temperature anomalies inferred from tree-ring densities show a larger amplitude response than is consistent with the degree of cooling found in thermometer measurements (Fig. 1; Tingley et al 2014).
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