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- W4385493905 abstract "<strong class=journal-contentHeaderColor>Abstract.</strong> The mid-Pliocene (3.3–3.0 Ma) is the most recent period in Earth’s history of sustained, global warmth analogous to predicted near-future climates. Despite considerable efforts to characterize and understand the climate dynamics of the mid-Pliocene, the deep ocean and its response to this warming remains poorly understood. Here we present new mid-Pliocene Mg/Ca and Δ<sub>47</sub> (“clumped isotope”) temperatures from the deep Pacific and North Atlantic oceans. These records cover the transition from Marine Isotope Stage (MIS) M2 — considered the most pronounced “glacial” stage of the mid-Pliocene — to the warm KM5 interglacial. We find that a large (>4 °C) temperature gradient existed between these two basins throughout that interval, with the deep North Atlantic considerably warmer and likely saltier than at present. We interpret our results to indicate that the deep Pacific and North Atlantic oceans were bathed by water masses with very different physical properties during the mid-Pliocene, and that only limited deep oceanic exchange occurred between the two basins. Our results point to a fundamentally different mode of ocean circulation or mixing compared to the present, where heat and salt is distributed from the North Atlantic into the Pacific. The amplitude of cooling observed at both sites during MIS M2 suggests that changes in benthic δ<sup>18</sup>O associated with this cold stage were mostly driven by temperature change in the deep ocean rather than ice volume." @default.
- W4385493905 created "2023-08-03" @default.
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- W4385493905 date "2023-08-02" @default.
- W4385493905 modified "2023-10-16" @default.
- W4385493905 title "Reply on RC2" @default.
- W4385493905 doi "https://doi.org/10.5194/cp-2023-13-ac2" @default.
- W4385493905 hasPublicationYear "2023" @default.
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