Figure 2

(a) Monthly coral Sr/Ca records of KN2 and PB. (b) Enggano coral SST record estimated from KN2 and PB (black solid line). Uncertainty envelopes (95% confidence levels, gray dashed line) are estimated via a Monte Carlo approach23,24. (c) Uncertainty of the Enggano SST record in °C. Arrows in (a) mark extreme pIOD events of 2006, 1997 and 1994 discussed in11, the El Niño year of 1982 (grey arrow), and the true pIOD events of 1972, 1967, 1963, 1961 and 1946 listed in28 (from right to left).