Fig 6. Greenland ice geochemistry across the Pt spike and known Iceland volcanic eruption intervals.

A comparison of Greenland ice geochemistry across the Younger Dryas platinum spike (upper panels A-C) and the 8^th Century Katla eruption (bottom panels D-F). A) Platinum concentrations in the GISP2 ice core [40]; B) GISP2 volcanic sulphate concentrations [41,116]; C) NGRIP volcanic sulphate concentrations [41,116]; D) Mean non-crustal thallium concentrations from four Greenland ice cores [90]; E) Mean non-crustal bismuth concentrations from four Greenland ice cores [90]; F) Non-sea salt sulphur from the same four Greenland ice cores as in panels E and F [90].