In this new paper published in Nature Communications Earth & Environment Dr. Niels de Winter and co-authors reconstruct absolute seasonal temperature by measuring clumped isotope in bivalve shells. They prodiced highly precise monthly sea surface temperatures at around 50 °N latitude from individual oyster and rudist shells of the Campanian greenhouse period (78 million years ago) the seasonal range at 50 °N comprised 15 to 27 °C. In agreement with fully coupled climate model simulations, greenhouse climates outside the tropics were warmer and more seasonal than previously thought.
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