Geophysical Research Letters
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 the central equatorial Pacific in global compilations, with foraminiferal assemblage‐based estimates suggesting the region was within 1°C of modern temperatures during the LGM. This is in stark contrast to multi‐proxy evidence from the eastern and western Pacific and model simulations which support larger cooling. Here we present the first estimates of glacial SST in the central equatorial Pacific from Mg/Ca in Globigerinoides ruber. Our results show that the central Pacific cooled by about 2.0°C during the LGM, in contrast with previous global compilations but in agreement with models. Our data support a larger magnitude of tropical LGM cooling, and thus a larger equilibrium climate sensitivity, than previous studies which relied on foraminiferal assemblages in the central tropical Pacific.
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Article states: "All radiocarbon, Mg/Ca and oxygen isotope data presented in this study are included in the Supporting Information and are archived at the National Oceanic and Atmospheric Administration National Centers for Environmental Information database (https://www.ncdc.noaa.gov/paleo/study/29252)."
Original Publication Citation
Monteagudo, M. M., Lynch‐Stieglitz, J., Marchitto, T. M., & Schmidt, M. W. (2021). Central equatorial Pacific cooling during the last glacial maximum. Geophysical Research Letters, 48(3), 1-10, Article e2020GL088592. https://doi.org/10.1029/2020GL088592
Monteagudo, Minda Moriah; Lynch-Stieglitz, Jean; Marchitto, Thomas M.; and Schmidt, Matthew W., "Central Equatorial Pacific Cooling During the Last Glacial Maximum" (2021). OES Faculty Publications. 399.