Abstract Explosive volcanism resulting in stratospheric injection of sulfate aerosol is a major driver of regional to global climatic variability on interannual and longer timescales. However, much of our knowledge of the climatic impact of volcanism derives from the limited number of eruptions that have occurred in the modern period during which meteorological instrumental records read more Medieval Irish chronicles reveal persistent volcanic forcing of severe winter cold events, 431–1649 CE – Mayewski et. al. – Environ. Res. Lett., 2013