Pronounced interannual variability in tropical southPacific temperatures during Heinrich stadial 1

摘要

The early last glacial termination was characterized by intense north Atlantic cooling andweak overturning circulation. This interval between ~18,000 and 14,600 years ago, known asHeinrich stadial 1, was accompanied by a disruption of global climate and has been suggested asa key factor for the termination. However, the response of interannual climate variability in thetropical Pacific (El nino-southern oscillation) to Heinrich stadial 1 is poorly understood. Herewe use sr/Ca in a fossil Tahiti coral to reconstruct tropical south Pacific sea surface temperaturearound 15,000 years ago at monthly resolution. unlike today, interannual south Pacific seasurface temperature variability at typical El nino-southern oscillation periods was pronouncedat Tahiti. our results indicate that the El nino-southern oscillation was active during Heinrichstadial 1, consistent with climate model simulations of enhanced El nino-southern oscillationvariability at that time. Furthermore, a greater El nino-southern oscillation influence in thesouth Pacific during Heinrich stadial 1 is suggested, resulting from a southward expansion orshift of El nino-southern oscillation sea surface temperature anomalies.