Articles | Volume 17, issue 5
Clim. Past, 17, 2273–2289, 2021
https://doi.org/10.5194/cp-17-2273-2021
Clim. Past, 17, 2273–2289, 2021
https://doi.org/10.5194/cp-17-2273-2021
Research article
27 Oct 2021
Research article | 27 Oct 2021

Evolution of mean ocean temperature in Marine Isotope Stage 4

Sarah Shackleton et al.

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Short summary
In this study, we measure atmospheric noble gases trapped in ice cores to reconstruct ocean temperature during the last glaciation. Comparing the new reconstruction to other climate records, we show that the ocean reached its coldest temperatures before ice sheets reached maximum volumes and atmospheric CO2 reached its lowest concentrations. Ocean cooling played a major role in lowering atmospheric CO2 early in the glaciation, but it only played a minor role later.