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Here, the authors of this study reconstruct high-resolution temperature records using oxygen isotope values and Mg/Ca ratios in both surface- and subthermocline-dwelling planktonic foraminifera from a sediment core located in the tropical North Atlantic over the last 22 ky. Their results show significant changes in the vertical thermal gradient of the upper water column, with the warmest subsurface temperatures of the last deglacial transition corresponding to the onset of the Younger Dryas. [Source: Proceedings of the National Academy of Sciences of the United States of America]
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