Decadal-to-centennial increases of volcanic aerosols from Iceland challenge the concept of a Medieval Quiet Period

Gabriel I, Plunkett G, Abbott PM, Behrens M, Burke A, Chellman N, Cook E, Fleitmann D, Hörhold M, Hutchison W, McConnell JR, Óladóttir BA, Preiser-Kapeller J, Sliwinski JT, Sugden P, Twarloh B and Sigl M