Plunkett , G., Sigl , M., Pilcher , J. R., McConnell , J. R., Chellman , N., Steffensen , J. and Büntgen , U. (2020) “Smoking guns and volcanic ash: the importance of sparse tephras in Greenland ice cores”, Polar Research, 39. doi: 10.33265/polar.v39.3511.