Extreme climate after massive eruption of Alaska’s Okmok volcano in 43 BCE and effects on the late Roman Republic and Ptolemaic Kingdom

McConnell JR, Sigl M, Plunkett G, Burke A, Kim WM, Raible CC, Wilson AI, Manning JG, Ludlow F, Chellman NJ, Innes HM, Yang Z, Larsen JF, Schaefer JR, Kipfstuhl S, Mojtabavi S, Wilhelms F, Opel T, Meyer H and Steffensen JP