Central Equatorial Pacific Cooling During the Last Glacial Maximum

Establishing tropical sea surface temperature (SST) during the Last Glacial Maximum (LGM) is important for constraining equilibrium climate sensitivity to radiative forcing. Until now, there has been little data from central equatorial Pacific in global compilations, with foraminiferal assemblage-based estimates suggesting region was within 1°C of modern temperatures LGM. This stark contrast multi-proxy evidence eastern and western model simulations which support larger cooling. Here we present first glacial SST Mg/Ca Globigerinoides ruber. Our results show that cooled by about 2.0°C LGM, previous compilations but agreement models. a magnitude LGM cooling, thus sensitivity, than studies relied on assemblages Pacific.